Lecture notes on musculocutaneous nerve

Musculocutaneous nerve

 

Plexus : it is arises from the brachial plexus

Cord of brachial plexus : it is arises from lateral cord of brachial plexus

Root value : C5-7

Compartment : it supply anterior compartment of the arm

Location : front of the arm

Course :

·         After arising from lateral cord of brachial plexus ,  It follows the course of the third part of the axillary artery (part of the axillary artery distal to the pectoralis minor) 

·         Then it runs downward and laterally

·         Then it pierces the coracobrachialis which it supplies

·         Then it descend obliquely ( from medial to lateral) in between biceps brachii (in front ) and brachialis (behind)

·         At  the lateral side of the arm and  2 cm above the elbow,  it pierces the deep fascia lateral to the tendon of the biceps brachii and

·         Then it  is continued into the forearm as the lateral cutaneous nerve of the forearm

Branches and distribution:

1.    Muscular branches to biceps brachii, corocobrachialis and brachialis

2.    Articular branch to elbow joint through it branch to the brachialis muscle

3.    Cutaneous branch the lateral cutaneous nerve of forearm supplied the skin on the front and lateral aspect of the forearm

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