Muscular branches of musculocutaneous nerve

The muscular branches of musculocutaneous nerve are responsible for providing motor innervation to the muscles within the flexor compartment of the arm.

These branches include:

Branch to the Coracobrachialis Muscle

As the musculocutaneous nerve pierces the coracobrachialis muscle to enter the flexor compartment of the arm, it gives off a muscular branch that innervates the coracobrachialis.

Branches to the Biceps Brachii and Brachialis Muscles

While descending through the arm between the biceps brachii and brachialis muscles, the musculocutaneous nerve gives rise to muscular branches that innervate the short and long heads of the biceps brachii, as well as the lateral portion of the brachialis muscle.

The branching patterns of the muscular branches of musculocutaneous nerve exhibit considerable variability. In one scenario, a single branch may arise from the main trunk of the nerve and then divide into two secondary branches. Alternatively, two branches may originate independently from separate points along the main trunk. In a less common pattern, two primary branches may emerge, with the proximal branch further dividing into two secondary branches to supply each head of the biceps brachii, while the distal branch innervates the common belly of the biceps.