Anterior compartment of the arm

Last revised by Dr Daniel J Bell on 21 Aug 2019

The anterior compartment of the arm is one of the two compartments of the arm.

A sheath of deep fascia surrounds the arm, the brachial fascia. Two intermuscular septa (medial and lateral) extend from it to attach to the humerus at the medial condylar ridge and lateral supracondylar ridge, respectively. These septa divide the arm into its anterior and posterior compartments.

Three flexors:

Primarily by the musculocutaneous nerve (C5,6), although the radial nerve (C7) does supply a small lateral part of brachialis.

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