Comparative anatomy of the Radius and ulna скачать в хорошем качестве

Comparative anatomy of the Radius and ulna

Radius While in the human the radius and ulna are separated by an interosseus space and articulate only at their extremities, allowing for significant capability of supination and pronation, these movements are much more limited in domestic animals due to the gradual fusing of the two bones. The extreme case is exhibited by the horse. The radius forms the shaft-like rod of the distal limb, which is bowed to varying degrees amongst species. It articulates proximally with the distal humerus, caudally with the ulna, and distally with the carpus. Medially on the distal articular process, a styloid process projects, which is mirrored laterally by the ulna. Ulna The Ulna's greatest contribution to functional anatomy is in the formation of the olecranon, or the point of the elbow, which gives rise to the attachment of the triceps muscle. The olecranon articulates with the humerus via its anconeal process. The olecranon develops as an apophysis, i.e.. from a separate site of ossification. The trochlear notch on the cranial aspect of the ulna articulates with the large trochlea of the humerus which forms the main elbow joint capable of flexion and extension. Just distal to the trochlear notch, a large medial coronoid process and a smaller lateral coronoid process can be seen. Distally (where unfused), the lateral styloid process articulates with the ulnar carpal bone. For more info, visit our Facebook:   / animalsanatomy   Don't forget to subscribe, share and hit the bell