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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 ...
The olecranon is a large, thick, curved eminence, situated at the upper and back part of the ulna. It is bent forward at the summit so as to present a prominent lip which is received into the olecranon fossa of the humerus in extension of the forearm. Its base is contracted where it joins the body and the narrowest part of the upper end of the ...
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 ).
Extension is limited by the olecranon reaching the olecranon fossa, tension in the anterior ligament, and resistance in flexor muscles. Forced extension results in a rupture in one of the limiting structures: olecranon fracture, torn capsule and ligaments, and, though the muscles are normally left unaffected, a bruised brachial artery. [12]
The olecranon fossa (depression that articulates with the radius) is located proximal to the distal articlular surface, with a height and weight of around 30 millimetres (1.2 in) making a triangular shape. This fossa was under the attachment of the m. anconeus muscle, making a firm and robust accessory point. [1]
It is directly inferior to the coronoid fossa anteriorly and to the olecranon fossa posteriorly. In humans, these two fossae, the most prominent in the humerus, are occasionally transformed into a hole, the supratrochlear foramen , [ 2 ] which is regularly present in, for example, dogs.
The posterior ligament is thin and membranous, and consists of transverse and oblique fibers.. Above, it is attached to the humerus immediately behind the capitulum and close to the medial margin of the trochlea, to the margins of the olecranon fossa, and to the back of the lateral epicondyle some little distance from the trochlea.
Its scapula was characterized by a distally located suprascapular fossa; the deltoid crest was well developed. The humerus of Plesiotypotherium was slightly thinner than in Trachytherus, and had a characteristic perforation in the olecranon fossa. The entepicondyle, ectepicondyle and supracondylar crest were well developed.