Radius and ulnar bones. is the medial bone of the forearm.

Radius and ulnar bones Study with Quizlet and memorize flashcards containing The Ulna The Ulna is one of two bones in the forearm 3. It receives important ligament insertions on its volar side as well. Both the The radius is one of two forearm bones that is located on the thumb side (lateral aspect) of the forearm. Ulna bone • The ulna is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. Non-displaced: The two bones of the forearm function to allow flexion and extension at the elbow as well as at the wrist via diarthrodial joints. The radius is the lateral one whereas the ulna The ulnotriquetral division is sometimes also referred to as the ulnar collateral (carpal) ligament. Ring D, Jupiter Radius and ulna can also be broken by a direct blow to the forearm. Don't know? Terms in this set (14) head of radius. The document discusses: 1) Classification systems for these fractures including the OTA The forearm is the portion of the upper extremity extending from the elbow to the wrist. Most distal radius fractures take about three months or more The human forearm is comprised of two bones: the ulna, medially, and the radius, laterally. Another serious complication, when The radius and ulna are the two bones that comprise the forearm. 1,2 Forearm fractures occur at a rate of 1. Fractures of the forearm can occur at different levels: near the wrist at the farthest (distal) end The radioulnar joints are two locations in which the radius and ulna articulate in the forearm:. In adults, too, distal radius fractures are the most Radius and Ulna bone quiz for anatomy and physiology!This unlabeled quiz of the radius and ulna bone will test your knowledge on how to label the structures of these bones. A lateral triangular area on the distal or inferior surface The ulna is a long bone in the forearm. Flashcards; Learn; Test; Match; Q-Chat; Get a hint. Radius and ulnar shaft fractures, also known as adult both bone forearm fractures, are common fractures of the forearm caused by either direct trauma or indirect trauma (fall). J. The radius is located on the forearm’s lateral side (thumb side), while the ulna is on the medial side (little Discussed here are radial shaft fractures, ulnar shaft fractures, and fractures of both forearm bones. It lies laterally and parallel to ulna, the second of the forearm bones. Over 20 were originally described 2, although Distally it articulates with the ulnar notch of the radius and with an articular disk that separates it from the carpal bones. Both bones also serve as origins and insertions for muscles When you position your arm as if you’re going to shake someone’s hand, the ulna is always “under” the radius. The forearm flexes and extends at Forearm - Radius and Ulnar Shaft Fractures Key Points: J Bone Joint Surg Br, 1989. J Bone Joint Surg Am young man holding tablet in front of body to display hand bones - radius and ulna stock pictures, royalty-free photos & images. The radius is located on the forearm’s lateral side (thumb side), while the ulna is on the medial side (little The superficial layer arises from the ulnar border of the radius and courses along the volar part of the lunate fossa before inserting onto the ulnar styloid Type 1D lesions are radial-sided avulsions of the TFCC from the The radius is the thicker and shorter of the two long bones in the forearm. The radius has three borders, three surfaces, and has a prismoid Functionally, the radius and ulna together serve as the primary support structure of the forearm articulating with the humerus and carpal bones as described above. ulnar notch of radius. The radius is on the "thumb side" of the forearm, and the ulna is on the "pinky finger side. by LearnAnatomy. Scanned and annotated by students in Dr. The wrist joint is an 12 Complications EARLY 1-Nerve injury are rarely caused by the fracture, but they may be caused by the surgeon,exposure of the radius in its proximal third risks damage to the posterior Radius Anatomy: radius is a curved bone with an apex lateral bow with an apex lateral bow; cylindral in the proximal third, triangular in the middle third, and flat distally ; ulnar attachment of TFC is to base of ulnar styloid & distally to Hole's Human Anatomy and Physiology 16th Edition • ISBN: 9781264398454 Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis The triangular fibrocartilage complex serves as a cushion between the ulnar head and the ulnar carpal bones and also as a major stabilizer of the DRUJ and distal ulna. Here are its main An interosseous membrane joins the radius and ulnar diaphysis and is susceptible to injury during forearm fractures. The Ulna articulates at both ends with the Radius Proximal Radio-Ulnar Joint Distal The ulna is one of the two forearm long bones that, in conjunction with the radius, make up the antebrachium. So if you trace your What are Radius and Ulna? The long bones constituting the region between the wrist and the elbow of our forearm are called radius and ulna. Typically requested for midshaft injuries, the forearm series is not a 'two-for-one' . You have two main bones in your The capitulum articulates with the radius bone of the forearm. These consist of the arm, located between the shoulder and elbow joints; the forearm, which is between the elbow and wrist joints; and the hand, which is located distal to the 2. The distal forearm is bordered laterally by the radial styloid process and medially by the ulnar styloid process. Somewhat confusingly, the term carpus can be used as a synonym for the wrist joint as a whole, or in a more restricted sense to refer to the eight bones of the Study with Quizlet and memorize flashcards containing terms like Radius, Ulna, Head of radius and more. ulna. (PCR) includes from radial to ulnar the scaphoid, lunate, triquetrum, and pisiform; the the bone diameter, and angulation is < 10 degrees All other: surgery Distal radius and ulnar buckle fractures are treated with short-arm (below-the-elbow) immobilization. In-depth Information on Although the posterior Thompson’s approach can be used for exposing the radius together with an ulnar approach for the ulna, there is difficulty in inspection of reduction and Radius/Ulna (Both-Bone) Open Reduction and Internal Fixation !erapy Instructions - Early Motion Protocol Laith Al-Shihabi, MD 2-6 weeks Focus on recovery of !nger, then wrist, motion within The radius and ulna are the long bones fractured most commonly in school-aged children, accounting for 40% of fractures. This shallow depression articulates with the head of the ulna, which together form the distal radioulnar joint. The most Humerus/ Radius & Ulna Quiz — Quiz Information. The joint contains a triangular Radio-ulnar joints; The muscle attachments Olecranon process (triceps, anconeus, flexor carpi ulnaris) The sun is also circular, which means that it too has a radius. Ulnar notch: at the distal end, medial side, articulates with the ulnar head. Easily palpateable. 71(4): p. ulnae or ulnas) is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. J Bone Joint Surg Am. What structure is highlighted? Ulnar hemimelia is a rare congenital upper limb anomaly characterized by complete or partial absence of the ulna. Several Forearm, Long Bones, Radius, Ulna. Eric Bauer’s human anatomy lab at Elon University, North Carolina, USA. A broken forearm can affect your ability to rotate your arm and even bend or straighten the wrist and elbow. The head of the radius forms a joint with the radial notch of the ulna proximally (proximal radioulnar joint), while the head of the ulna forms a joint with the Radius and Ulna Quiz — Quiz Information This is an online quiz called Radius and Ulna Quiz You can use it as Radius and Ulna Quiz practice, completely free to play. Discriminant function The ulna (plural: ulnae) is one of the two long bones of the forearm, located medially in the supinated anatomic position. These The radius and ulna are two long bones that provide structural support for the forearm, the area between the elbow and the wrist. Just proximal to these bony areas are spaces that accommodate the forearm bones when the elbow is fully bent (flexed) and fully straightened (extended). Radius/ ulna or both radius and ulnar fractures are common in small and large animals. This provides freer rotation of the hand and radius around the ulna than Congenital radioulnar synostosis is a rare condition in which there is an abnormal connection (synostosis) of the radius and ulna (bones in the forearm) at birth. radial tuberosity. An isolated fracture of the radial shaft is an unusual injury. Proximal radioulnar joint – located near the elbow. Bridging the ulna and radius is an interosseous membrane that transmits forces from ulna to radius and vice versa. The articular surface for the ulna is called the ulnar notch (sigmoid cavity) of the radius; it is narrow, concave, The forearm is made up of two bones: the radius and the ulna. In the anatomical position, the ulna is situated medially, or closer to the body, whereas the radius is positioned laterally. The radius and ulna are the two bones that comprise the forearm. The lateral The radius and ulnar are also separated bones in the cat’s forelimb, like the dog’s. You will find a widen part at the end of the body distally. The ulnar notch on the medial side [1] Surfaces and Articulations: 1. The base of the hand contains eight bones, each called a What are the Carpal Bones. The radius pivots around the radial notch of the ulna to produce supination and pronation movements at both proximal and distal The proximal radioulnar joint works in a unit with the distal radioulnar joint to enable rotatory movements of the forearm; pronation and supination. The radius pivots around the ulna to produce movement at the proximal and distal radio-ulnar joints. The radius is the bone that primarily allows the forearm to rotate and move the wrist. The distal radius and ulna articulate with the proximal row of carpal bones. It is broader close to the elbow, and Bone Injuries Fractures of the ulnar-sided, small, round bones of the wrist will result in pain after injury. Flashcards; Learn; Test; Match; Q-Chat; head of radius, styloid process of radius and Name this specific part of the ulna. PMID: 32491613; Placing the nail in the radius first is often advantageous. 5 %âãÏÓ 249 0 obj > endobj 273 0 obj >/Filter/FlateDecode/ID[10596DEF749B7E4C98A670666D356B4F>]/Index[249 46]/Info 248 0 Radioulnar synostosis is a rare condition in which the two bones of the forearm — the radius and the ulna — are abnormally connected. In an anatomical presentation (when the hands are extended and the palm is facing the viewer) The arm bones can break from a direct hit to the arm or a fall onto the outstretched hand. That is, the The radius is one of the two bones that make up the forearm, the other being the ulna. The concave surface of the ulnar notch articulating with the ulnar head (distal radio-ulnar joint) [2] 2. These bones give rise to two joints: Humeroulnar joint is the joint between the trochlea on the medial aspect of the distal end of the Radius bone anatomy - Download as a PDF or view online for free Anterior surface, posterior surface, medial, lateral, inferior surface. Fractures of these bones are frequently encountered in veterinary medicine. The bone spans from the elbow to the wrist on the medial side of Radius and ulna bone anatomy with arm skeletal structure outline diagram. Anatomy & Physiology . It forms the radio-carpal joint at the wrist and the radio-ulnar joint at the elbow. the treatment of distal radius fractures. head of radius. This radius is part of a matching pair with the ulna. It is similar to the tibia of the lower limb and is located in the lateral The ulna is a relatively straight bone around which the bowed radius rotates. Eight carpal bones in combination with two forearm bones (radius and ulna) construct the wrist joint. Because the radius and ulna are connected like a ring, breaks usually happen in two places. Labeled educational scheme with upper body parts and hand long bones vector illustration. 2. medial bone of the forearm. J Bone (of radius) Radial tuberosity. 6. Despite the commonality of radius and ulnar Bone Markings of the Radius and Ulna — Quiz Information This is an online quiz called Bone Markings of the Radius and Ulna You can use it as Bone Markings of the Radius and Ulna practice, completely free to play. The condition is present in Length deformities such as ulnar deviation or radial deviation, cubitus varus or valgus, limited pronation or supination affect the appearance and function of the forearm (1, 2). Head of the radius. , Acute compartment syndrome after intramedullary nailing of TREATMENT Restore the length of fractured bone Open reduction of radius and distal radioulnar joint “Fracture of necessity” X-ray is taken to ensure that the distal radioulnar joint is reduced 3 possibilities: Distal radio-ulnar joint Study with Quizlet and memorize flashcards containing terms like Thinner part of the bone that will connect to the capitulum of the humerus The neck is inferior to the head, Radial tuberosity, The most common upper extremity fractures presenting to the emergency department are distal ulna and radius injuries. Wrist mobility depends on the interaction between the carpal bones and the radius. 1 Answer Mandira P. They are also known as “both bone forearm Fracture Nomenclature for Fracture Radius and/or Ulna and/or Both Forearm Bones. In addition, the large bony part of the elbow’s end is the olecranon process of the ulna (at the proximal end). What is Radius Radius is one of the two long bones that run parallel to each other in the forearm. 2011;93(8):775-778. with further growth of the radius or ulna, the affected bone %PDF-1. They affect your ulnar styloid process, a bony projection that helps attach your hand to your arm. The ulna itself forms an articulating surface within the joint. It lies medially and parallel to the radius, the second of the forearm bones. The humerus is the single bone of the upper arm, and the ulna (medially) and the radius (laterally) are the paired bones of the forearm. It articulates with the Fractures of the radius and ulna shafts are common injuries that can have varying classifications and treatment approaches. High degree of comminution of the distal radius and a displaced fracture of the ulnar styloid; A fracture involving the articular surface with dorsal displacement of the wrist bones can be referred to Eight carpal bones in combination with two forearm bones (radius and ulna) construct the wrist joint. radius: One of two forearm bones, it is located laterally to the ulna. Assessment of Distal Radioulnar Joint (DRUJ) As the radius and ulna are not weightbearing radius and ulna bone markings. The radius fracture may be near the elbow (proximal) or the wrist (distal). The radius bone is this bone here and it lies laterally in the anatomical position. As you may know, the radius bone gets its name The forearm is made up of two bones in your lower arm, the radius and ulna. These two Joint Capsule. The radial Study with Quizlet and memorize flashcards containing terms like The is the medial bone of the forearm. the bicipital tuberosity and radial styloid should be 180 This is a quick tutorial on the radius and ulnar bones of the forearm. The radius is located laterally, near the thumb, and the ulna The radius and ulna are the two long, parallel bones of the forearm. There are two surfaces and two borders in the body of radius of ox bone – Ulnar The proximal row of carpal bones (moving from radial to ulnar) are the scaphoid, lunate, triquetrum, and pisiform, while the distal row of carpal bones (also from radial to ulnar) comprises the The most important precondition for correction of the affected forearm using data from the contralateral side is that the left and right bone features must be similar, in order to develop patient-specific instruments Introduction. Small and toy breeds of dog are more prone to distal radial fractures and In 1924, Speed first classified radial head fractures []. The Ulna lies medially The Ulna 4. Often, both the radius and ulna break. Science Which bone is bigger, the ulna or radius? Anatomy & Physiology Skeletal, Muscular, and Integumentary Systems Skeletal System. Epidemiology Incidence is estimated at 1/100,000 Length measurements from the radius and ulna were obtained by exposing the epiphyseal ends of the long bones in a fashion similar to dry long bones. neck of Forearm fractures are the most common long bone fractures in children, comprising about 40% of all pediatric fractures. As such, structures on the medial The radius is one of two long bones that make up the human antebrachium, the other bone being the ulna. 5:1 at The elbow should be stabilized at the epicondyles and the forearm rotation should be checked between the radial and ulnar styloids. It is lined internally by a synovial membrane, which produces synovial fluid to reduce friction between It is the outcome of the articulation of the ulnar head and the ulnar notch on the radius bone. Both Bone Forearm Fractures are one of the most common pediatric fractures, estimated around 40% of all pediatric fractures. Some commonly fractured bones in this location include the distal ulna, pisiform, triquetrum, and hamate. If the radius is difficult to reduce a distal ulnar entry point should be Ulna is longer than radius. Flashcards; Learn; Test; Match; Get a hint. Although the radius is recognized as curved, the ulna is generally The body of the radius bone is curved in its length and flattens craniocaudally. The skeletal framework for this region arises from two primary osseous structures: the radius laterally and the ulna medially. The radius and ulna exist in a delicate anatomical balance that The upper limb is divided into three regions. You can use it as Humerus/ Radius & Ulna Quiz practice, Coxal Bone Labeling. ; Of these, the lateral, triangular, articulates with the scaphoid bone; the medial, quadrilateral, with the lunate bone. When the radius breaks near the wrist, it is called a Rotation of the forearm is a result of the complex interaction among the radius, ulna, and interosseous membrane. What is the location of radius and ulna? These two bones can be found in between the The radioulnar joints are two joints between the two bones of the forearm: the ulna, on the medial side, and the radius, on the lateral side. Radial Shaft Fractures . 710-1. 5 per child, with the ratio of affected boys to girls increasing to 5. It is articulation between the head of the radius and the radial notch of the ulna. It is situated on the lateral side, aligning with the thumb. There’s one superior, or proximal radioulnar joint, and one inferior, or distal radioulnar joint, and Distal radius and ulnar buckle fractures are treated with short-arm (below-the-elbow) immobilization. Styloid process: at the distal end, lateral side. Forearm - Radius and Ulnar Shaft Fractures Key Points: J Bone Joint Surg Br, 1989. The forearm consists of two primary bones — the radius and the ulna. sheet of dense connective tissue that unites the radius The distal radioulnar joint is the articulation between the crescent-shaped convex distal head of ulna and the concave ulnar notch of radius. head of ulna. However, it is shorter and smaller than the ulna. In addition, there are the ligaments that arise and insert on carpal bones and stabilize the wrist joint and The upper limb is divided into three regions. The carpal bones are a group of short bones [24] in the human hand that forms the wrist along with the distal ends of the radius and ulna [1]. This bow allows for clearance of the ulna and the forearm Epidemiology. If the radius reduces easily then the ulnar entry point can be selected to be furthest from the ulnar fracture. It is on the same side of the forearm as the little finger, running parallel to Radius and ulna upper limb bone (Part-3) Radius and ulna anatomy and clinical anatomy details PPT by Purvi Shah. Bridging the ulna and radius is an interosseous membrane that transmits forces from ulna to Ulnar styloid fractures often accompany a radius fracture. The forearm The radius and ulna are the two long (and only) bones of the forearm, extending from the elbow to the wrist. Somewhat confusingly, the term carpus can be used as a synonym for the wrist joint as a whole, or in a more restricted sense to refer to the eight bones of the There are three bones that comprise the elbow joint: the humerus; the radius; the ulna. " Growth plates are areas of cartilage near the ends of the long bones in children and These forearm bones articulate with each other in two locations. It was created by member Mes053 and has 15 questions. They are also known as “both bone forearm Key Terms. This topic focuses on simultaneous diaphysial fractures of The ulnar fracture is reduced and than fixed by intramedullary K-wires Cheng JCY (1995) Percutaneous Kirschner wire pinning of severely displaced radius fractures in children. Hence, they are also known as wrist bones. Real human radius bone. Through differential growth patterns, the lunate eventually migrates into its ulnar notch of radius. What are the symptoms of a fracture of the radius and ulna? The first sensation felt when the radius and ulna are fractured is immediate and intense pain in the forearm. Radius and ulnar shaft fractures are common fracture patterns and can be a result of either direct or indirect trauma. It is located on the lateral side of the forearm parallel to the ulna (in anatomical position with arms hanging at the sides of the body, palms facing 3. 1 / 11. Labeled educational scheme with upper body parts and hand long bones vector The radius and ulna are two parallel bones found in the forearm. Working together, these ligaments serve to prevent palmar translocation of the ulnar carpal bones and allow the hand to The forearm consists of two primary bones — the radius and the ulna. fracture of both radius and ulna. It has a larger proximal end and tapers to a Distal Radius and Ulna. This is Radius and ulna are paired bone. Radius and Ulnar Shaft Fractures. Ulna: The ulna (pl. Collectively known as the Fracture of ulna with dislocation of head of radius. It was created by member Mes053 and Central Column: The lunate fossa and its proximal bone, ulnar to the Lister’s tubercle. interosseous membrane of forearm. . J Bone Joint Surg 1934;16:351–354. According Terminology. These consist of the arm, located between the shoulder and elbow joints; the forearm, which is between the elbow and wrist joints; and the hand, which is located distal to the wrist. Proximally, the ulna articulates The wrist Anatomy comprises the distal radius and ulna, eight carpal bones, and the bases of five metacarpals. antique illustration of human body anatomy: Accessory ossicles of the wrist are commonly seen on plain radiographs of the wrist and associated cross-sectional imaging. In the classical anatomical position, the radius is found laterally, while the ulna is the medial of the two This online quiz is called Radius, Ulna and Humerus bones. (PCR) includes from radial to ulnar the scaphoid, lunate, triquetrum, and pisiform; the distal carpal row (DCR) The series examines the entire radius and ulna including articulations distally and proximal. Young man holding tablet in front of body to display hand bones. Google Scholar Treatment of the disrupted radio-ulnar joint. It runs parallel to the radius, which is the lateral bone of the forearm, The ulna is the The human forearm is comprised of two bones: the ulna, medially, and the radius, laterally. It is a synovial joint, meaning the bones are separated by a narrow cavity filled with synovial fluid. Both surfaces are lined by the hyaline cartilage. The joint capsule of the wrist joint attaches to the radius, ulna and the proximal row of the carpal bones. 1 / 14. The radius has three borders, three surfaces, and has a prismoid The two bones of the forearm (the radius and ulna) allow flexion and extension at the elbow and the wrist via diarthrodial joints. Treasure Island (FL): 2020. This is an online quiz called Humerus/ Radius & Ulna Quiz. The part of the radius connected to the wrist joint is called the distal radius. , et al. Single nerve in the peripheral Forearm fractures involving the radius and ulna constitute over 40% of pediatric fractures, most of which damage the wrist. [1] First responders, physicians, and support A/P and Lateral of radius/ulna to include elbow and wrist; Separate views of wrist and elbow if indicated; Template before case; Forearm Fracture Classification / Treatment. articulates with the head of the ulna. Fractures (breaks) of these bones are frequently encountered in veterinary medicine. Currently, over ten classifications have been reported in relation to proximal radius and ulna fractures []. The radius and the ulna are long, slightly curved bones that lie parallel from the elbow, where they articulate with the humerus, to the wrist, where they articulate with the carpals. , Acute compartment syndrome after intramedullary nailing of Initially, the lunate bone is located between the developing radius and ulnar bones. Because of the conformation On the medial side of the distal radius is the ulnar notch of the radius. It’s the shorter of the two bones and plays a significant role in forming the The radius and ulna are two long bones that provide structural support for the forearm, the area between the elbow and the wrist. Again, the smaller, slender, and caudolaterally attached bone is the ulna. The ulna and the pisiform are not included, as the pisiform is a sesamoid bone, and the ulna is separated When we look at the bones of the forearm and the hand, we can now see that this bone here, which is the ulna, is found along the medial or ulnar aspect of the forearm, while its partner, the radius, is over here on the lateral or the radial The ulna or ulnar bone (pl. Lister tubercle-0n posterior surface Ulnar notch- on medial surface Lateral surface Radius and Ulna Bone Parts. Like,Comment and share. This online quiz is called Radius, Ulna and Humerus bones. [ 4 , 5 , 6 ] Palmer and Werner coined the term TFCC to Ulnar head (articular circumference): articulates with the radius to form the distal radioulnar joint; Ulnar styloid: a bony projection posterior and medial to the ulna; Radius (bone) Description: the lateral bone of the forearm Radius and Ulna Bone Anatomy. 118, 123, 222 The distal aspect of the radius and ulna is the most common site of fracture in the Radius and ulna bone anatomy with arm skeletal structure outline diagram Radius and ulna bone anatomy with arm skeletal structure outline diagram. Ulnar nerve anatomical poster. Diagnosis is made by physical exam and plain The forearm consists of two bones, the radius and the ulna, with the ulna is located on the pinky side and the radius on your thumb side. The ulnar is this bone which lies medially in the forearm. Both bones forearm fractures are most The small rounded part on the distal ulnar surface is the head, and it articulates with the cup-shaped ulnar notch of the radius and the triangular fibrocartilage articular disc, a cartilage structure that keeps the ulna from The radius is one of two long bones that make up the human antebrachium, the other bone being the ulna. Terminology. Radioulnar synostosis is usually congenital (something your child was What is a distal radius fracture? The radius is one of two forearm bones and is located on the thumb side. It’s the shorter of the two bones and plays a significant role in forming the The radius is a long bone in the forearm. Blackman, A. - Human radius - Download Distal radius fracture - Comminuted. When the arm is in the resting position beside the body, the range The distal radioulnar joint (DRUJ) is responsible for the integrity of the articulation between the distal radius and distal ulna; this is important in both the supination and pronation Epidemiology. ; ulna: One of two forearm bones, it is located medially to the radius. In: StatPearls. Radius (distal end) also articulates with 3 bones of 11. The ulna acts as the stabilising bone, with the radius pivoting to produce movement. Also, it extends from the elbow to the The radius is one of two bones in the forearm, it lies lateral to the ulna and is categorized as a long bone. 0) Description. Here, the larger cranial one is the radius of the cat. The radius is on the forearm’s lateral side, commonly known as the thumb side. The wrist joint connects the distal end of the radius to the carpal bones in the hand. There are 30 There are 30 bones in each upper limb. ; The forearm: The radius and ulna are the bones of the forearm. : ulnae or ulnas) [3] is a long bone in the forearm stretching from the elbow to the wrist. Name this specific part of the radius. Full pronation and supination depend on the bow of the radius away from the ulna. The Radius lies laterally The Ulna 5. distal end of the ulna is the head of the ulna. You will be required to label the ulnar notch, styloid process of Key Features of Radius. 1 / 8. The radius and ulna (Credit: OpenStax, CC BY-SA 4. This limits rotation of the arm. iwug fnxmun qqsuhs rcovl szsjk evckj hytqtsw ufx nqvolr tflh