Figure 3.

(A) Two laminae of fibrous thickening are visible on the brachial fascia, one coming from the fascia of the triceps brachii muscle, with a longitudinal course (asterisk). The other lamina of fibres appeared circumferential, between the medial intermuscular septum and the triceps brachii muscle (arrow). Both of these laminae were located over the ulnar nerve. (B) A probe was introduced through a hole in the brachial fascia, and placed above the course of the ulnar nerve, with an intact retinacular structure, highlighting the pattern of the course of the fibrous laminae. (C) Incision of the brachial and antebrachial fascia, which demonstrated the absence of connective or ligament structures located between the medial epicondyle and the olecranon, above the ulnar nerve. UN, ulnar nerve.