Musculocutaneous Nerve:Course,Motor,Sensory & Common Injuries
Musculocutaneous Nerve: The musculocutaneous nerve is responsible for bending/flexing our elbows. Tasks such as lifting a cup and brushing our teeth. The word musculocutaneous-‘Musculo’ implies its role in innervating muscles (motor part), and ‘cutaneous’ i.e. skin, suggests that has a sensory role.
Origin of the Musculocutaneous Nerve
Course of the Musculocutaneous Nerve
- After arising from the brachial plexus, the nerve leaves the axilla and pierces the insertion of the coracobrachialis muscle on the humerus.
- It then passes down anterior to the brachialis muscle of the arm, but deep to the biceps brachii muscle, innervating them both muscles.
- The musculocutaneous nerve then emerges laterally to the biceps tendon and continues in the forearm as a lateral cutaneous nerve. It provides sensory innervation to the lateral aspect of the forearm.
Motor functions of the Musculocutaneous Nerve
- Anterior compartment of the arm – the biceps brachii, brachialis, and the
Sensory functions of the Musculocutaneous Nerve
- Innervates skin on the lateral surface of the forearm.