posterior border of ulna

pos·te·ri·or bor·der of ul·na

[TA]
the sinuous palpable subcutaneous ridge on the posterior aspect of the ulna that extends from near the olecranon to the styloid process, demarcating the "anterior" (flexor) from "posterior" (extensor) compartments of forearm.
Synonym(s): margo posterior ulnae [TA]
References in periodicals archive ?
The smaller humeral head arises from the medial epicondyle of the humerus and larger ulnar head has an extensive origin from the medial margin of the olecranon process, proximal two thirds of posterior border of ulna, an aponeurosis which is common for FCU, extensor carpi ulnaris muscle and flexor digitorum profundus muscle and intermuscular septum between it and flexor digitorum superficialis muscle.
The belly on the medial aspect was larger and was arising from the medial margin of the olecranon process, proximal two thirds of posterior border of ulna, an aponeurosis which is common for FCU, extensor carpi ulnarismuscle and flexor digitorum profundus muscle and intermuscular septum between it and flexor digitorum superficialis muscle.

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