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fibro muscular tunnel

Muscular tunnel by pronator teres muscle for ulnar artery and median nerve in the lower arm
Figure1: Brachial artery (Ba) is divided into Radial (Ra) and Ulnar arteries (Ua) in the lower end of the arm itself. Then the Ulnar artery and the Median nerve (Mn) passes through a tunnel formed by the extensive additional humeral head of the pronator teres muscle (aHh-PT).  A fibromuscular tunnel formed by the humeral head of the Pronator teres was found arising from the medial intermuscular septum (M-IMS) and also from the fibrous arch form the shaft of the humerus to the medial intermuscula