Anterior compartment of the arm

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.

Muscles

Three flexors:

• biceps brachii muscle
• brachialis muscle
• coracobrachialis muscle

Arterial supply

• brachial artery

Innervation

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