At the junction of the antero-inferior surface of the coronoid process with the front of the body is a rough eminence, the tuberosity of the ulna, which gives insertion to a part of the Brachialis; to the lateral border of this tuberosity the oblique cord is attached.. The medial surface is bounded by the anterior and posterior borders.
If this process is disrupted during the rapid growth period of the foal, elbow dysplasia and subluxation of the humerus will develop. Its posterior surface, directed backward, is triangular, smooth, subcutaneous, and covered by a bursa. Because the separate center of ossification of the physis is not involved in formation of a joint, it is termed an apophysis. It is concave medially and has a proximal tuberosity for muscle attachment.
The medullary canal of the ulna functionally ends about one-third from the distal end.
In the distal aspect of the trochlear notch there is a synovial fossa, which is devoid of articular cartilage. At the junction of the antero-inferior surface of the coronoid process with the front of the body is a rough eminence, the tuberosity of the ulna (or ulnar tuberosity), which gives insertion to a part of the Brachialis; to the lateral border of this tuberosity the oblique cord is attached.
Gerardo De Iuliis PhD, Dino Pulerà MScBMC, CMI, in The Dissection of Vertebrates (Second Edition), 2011. Free part of upper limb > Etymology. The interosseous border (or crest) is the sharpest border on the ulna. The ulnar tuberosity is described in carnivores (and humans) and not included in the Terminologia Anatomica.
The upper epiphysis joins the body about the sixteenth, the lower about the twentieth year. The radial notch, for articulation with the head of the radius, is a curved surface that lies laterally along the base of the trochlear notch. It is a massive, blunt process. The trochlear (or semilunar) notch of the ulna articulates with the trochlear articular surface of the distal humerus. It lies opposite the radius, on the lateral aspect of the ulnar shaft between the anterior and posterior surfaces. The ulnar head is the enlarged distal end of the bone.
About the fourth year or so, a center appears in the middle of the head, and soon extends into the ulnar styloid process.
The triceps brachii muscle, the primary extensor of the forearm, has its insertion on the tuberosity of this process. The ulna is a long bone. It is broader close to the elbow, and narrows as it approaches the wrist. The olecranon is a large, thick, curved eminence, situated at the upper and back part of the ulna. It articulates proximally with the trochlea of the humerus and with the head of the radius. For some of them, your consent is necessary. Nicole P. Ehrhart, ... Timothy M. Fan, in Withrow and MacEwen's Small Animal Clinical Oncology (Fifth Edition), 2013. In man, the head of the ulna does not articulate with any of the bones of the carpus. Looking at all 47 fractures, the maximum pre-reduction greater tuberosity fracture displacement varied from 2 to 32mm and averaged 11mm, and after reduction the displacement varied from 1 to 20mm for an average of 3mm. In the rat, the ulna may articulate via its styloid process with the triquetrum and possibly the pisiform bone (see below for a discussion of this point). The shaft (or body) is the long segment of bone between the brachial tuberosity and the inflated distal end of the ulna.
There were 16 nerve injuries: 10 axillary, 3 brachial plexus, 1 median, and 1 ulnar.
In contrast to the more mobile radius, rotary motion is very restricted at the ulnar part of the elbow joint, sharply limiting the ulna in its ability to rotate around its long axis.
It is a roughened area located near the proximal end of the medial border of the ulna, just distal to the medial coronoid process.
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