Musculocutaneous Nerve

musculocutaneous nerve
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The musculocutaneous nerve is a noteworthy fringe nerve of the upper limb. In this article, we will take a gander at the connected life structures of the nerve – its anatomical course, engine capacities and cutaneous innervation. We will likewise consider the clinical relationships of harm to the musculocutaneous nerve.


musculocutaneous nerve



Nerve roots: C5-C7.

Engine capacities: Innervates the muscles in the foremost compartment of the arm – the coracobrachialis, biceps brachii and the brachialis

Tactile capacities: Gives ascend to the horizontal cutaneous nerve of the lower arm, which innervates skin on the sidelong surface of the lower arm.

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Anatomical Course

The musculocutaneous nerve emerges from the parallel rope of the brachial plexus, and in this way contains strands from spinal roots C5, C6 and C7.

In the wake of starting from the brachial plexus, the musculocutaneous nerve leaves the axilla, and pierces the coracobrachialis muscle, close to its purpose of addition on the humerus.

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It at that point goes down the arm, foremost to the brachialis muscle however profound to the biceps brachii, innervating them both.

The musculocutaneous nerve develops along the side to the biceps ligament and proceeds into the lower arm as the horizontal cutaneous nerve. It gives tactile innervation to the horizontal part of the lower arm.


Motor Functions

The musculocutaneous nerve innervates the muscles in the foremost compartment of the arm – the biceps brachii, brachialis and coracobrachialis. These muscles move the upper arm and the elbow. Furthermore, the biceps brachii likewise performs supination of the lower arm.

A decent memory apparatus to enable you to recollect these muscles is BBC.


Sensory Functions

The musculocutaneous nerve offers ascend to the horizontal cutaneous nerve of the lower arm.

This nerve at first enters the profound lower arm, however then punctures the profound belt to wind up subcutaneous. In this district, it tends to be found in closeness to the cephalic vein.

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The sidelong cutaneous nerve of lower arm innervates the skin of the parallel part of the lower arm.

Clinical Relevance: Musculocutaneous Nerve Lesion


Component of damage

Damage to the musculocutaneous nerve is generally phenomenal, as it is all around ensured inside the axilla. The most widely recognized reason is a cut injury to the axilla district.


Motor Function

Coracobrachialis, biceps brachii and brachialis muscles are deadened. Flexion at the shoulder is debilitated, however, can at present happen because of the pectoralis major. Flexion at the elbow is additionally influenced, yet can, in any case, be performed in light of the brachioradialis muscle. Likewise, supination of the influenced appendage is significantly debilitated, yet is created by the supinator muscle.


Sensor capacities

Loss of sensation over the horizontal side of the lower arm.

(Related: spine of sphenoid)



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