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The olecranon (/ oʊ ˈ l ɛ k r ə n ɒ n /, from Greek olene 'elbow' and kranon 'head'), is a large, thick, curved bony process on the proximal, posterior end of the ulna.It forms the protruding part of the elbow and is opposite to the cubital fossa or elbow pit (trochlear notch).
The cubital tunnel is bordered medially by the medial epicondyle of the humerus, laterally by the olecranon process of the ulna and the tendinous arch joining the humeral and ulnar heads of the flexor carpi ulnaris. [1]
Size compared to a human. Huaxiazhoulong is a large ankylosaurid, with an estimated body length of 6 metres (20 ft). The holotype specimen likely represents a mature individual, as evidenced by the fusion of the neural arches to the vertebral centrum, the co-ossified scapula and coracoid, high olecranon process of the ulna, and proximal fusion of the anterior and greater trochanters on the femur.
The elbow includes prominent landmarks such as the olecranon, the cubital fossa (also called the chelidon, or the elbow pit), and the lateral and the medial epicondyles of the humerus. The elbow joint is a hinge joint between the arm and the forearm ; [ 2 ] more specifically between the humerus in the upper arm and the radius and ulna in the ...
About the middle of either side of this notch is an indentation, which contracts it somewhat, and indicates the junction of the olecranon and the coronoid process. The notch is concave from above downward, and divided into a medial and a lateral portion by a smooth ridge running from the summit of the olecranon to the tip of the coronoid process.
Lateral surface of the olecranon process of the ulna and the superior proximal part of the posterior ulna: Artery: Deep brachial artery, recurrent interosseous artery: Nerve: Radial nerve (C5, C6, C7, C8, and T1) Actions: It is partly blended in with the triceps, which it assists in extension of the elbow.
The olecranon fossa is a deep triangular depression on the posterior side of the humerus, superior to the trochlea. It provides space for the olecranon of the ulna during extension of the forearm .
An articular branch that passes to the elbow joint while the ulnar nerve is passing between the olecranon and medial epicondyle of the humerus; In the forearm, via the muscular branches of ulnar nerve: Flexor carpi ulnaris [5] Flexor digitorum profundus (medial half) [5] In the hand, via the deep branch of ulnar nerve: [5] Hypothenar muscles