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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 ).
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 triceps, or triceps brachii (Latin for "three-headed muscle of the arm"), is a large muscle on the back of the upper limb of many vertebrates. It consists of three parts: the medial, lateral, and long head. [1] It is the muscle principally responsible for extension of the elbow joint (straightening of the arm).
The ulnar nerve and its branches innervate the following muscles in the forearm and hand: 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]
The anconeus muscle (or anconaeus/anconæus) is a small muscle on the posterior aspect of the elbow joint. Some consider anconeus to be a continuation of the triceps brachii muscle . [ 1 ] [ 2 ] [ 3 ] Some sources consider it to be part of the posterior compartment of the arm , [ 4 ] while others consider it part of the posterior compartment of ...
The antebrachial fascia (antibrachial fascia or deep fascia of forearm) continuous above with the brachial fascia, is a dense, membranous investment, which forms a general sheath for the muscles in this region; it is attached, behind, to the olecranon and dorsal border of the ulna, and gives off from its deep surface numerous intermuscular septa, which enclose each muscle separately.
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Muscle: Direction: Attachment: Triceps brachii muscle: Insertion: posterior part of superior surface of Olecranon process (via common tendon) Anconeus muscle: Insertion: olecranon process (lateral aspect) Brachialis muscle: Insertion: anterior surface of the coronoid process of the ulna: Pronator teres muscle: Origin