Fascial compartments of arm

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Cross-section through the middle of upper arm. Anterior is at top; posterior is at bottom

On the human body, the limbs can be divided into segments, such as the arm and the forearm of the upper limb, and the thigh and the leg of the lower limb. If these segments are cut transversely, it is apparent that they are divided into multiple sections. These are called fascial compartments, and are formed by tough connective tissue septa. The (upper) arm is divided into two compartments by the lateral intermuscular septum and the medial intermuscular septum: anterior and posterior.

Anterior compartment

It contains the Biceps brachii muscle, Brachialis muscle, and Coracobrachialis muscle.

It is supplied by the musculocutaneous nerve[1] and brachial artery.

Posterior compartment

It contains the Triceps brachii muscle.

It is supplied by the radial nerve and profunda brachii.

See also