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Muscular Branch of Musculocutaneous Nerve to Coracobrachialis (Left)
Nervous System

Muscular Branch of Musculocutaneous Nerve to Coracobrachialis (Left)

Ramus musculi coracobrachialis nervi musculocutanei

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Quick Facts

Origin: Musculocutaneous nerve (C5—C7).

Course: Pierces through the coracobrachialis muscle to enter the flexor compartment of the arm.

Branches: None.

Supply: Coracobrachialis muscle.

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Origin

The muscular branch to coracobrachialis arises from the musculocutaneous nerve (C5—C7).

Course

In most cases, when the musculocutaneous nerve arises from within the axilla, it pierces the coracobrachialis muscle and innervates it (Rea, 2016).

Sometimes, the musculocutaneous nerve does not pierce the coracobrachialis muscle; rather it travels down adhering with the median nerve. In this case, the common median and musculocutaneous trunk innervates the coracobrachialis (and biceps) muscle, while the musculocutaneous nerve alone supplies the brachialis only (Pacha Vicente et al., 2005). In some other cases, a communicating branch connects the musculocutaneous and median nerves.

Branches

There are no named branches.

Supplied Structures

Muscular branch of the musculocutaneous nerve provides motor innervation to coracobrachialis muscle.

List of Clinical Correlates

—biceps reflex

References

Pacha Vicente, D., Forcada Calvet, P., Carrera Burgaya, A. and Llusá Pérez, M. (2005) 'Innervation of biceps brachii and brachialis: Anatomical and surgical approach', Clin Anat, 18(3), pp. 186-94.Rea, P. (2016) Essential Clinically Applied Anatomy of the Peripheral Nervous System in the Head and Neck. Elsevier Science.

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Musculocutaneous Nerve

ScienceDirect image

The musculocutaneous nerve, after supplying the coracobrachialis, biceps, and brachialis muscles, continues in the interval between the last two muscles as a sensory nerve to supply the skin over the anterolateral aspect of the forearm, often as far as the thenar eminence.

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