Ultrasound-guided Musculocutaneous block

The musculocutaneous nerve (arrow) in the distal axilla runs in a fascial between the biceps and the coracobrachialis muscles.  The musculocutaneous nerve contributes to the sensory innervation of the elbow; below the elbow it becomes the lateral cutaneous nerve and supplies the skin of the lateral forearm.

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Ultrsound-guided block of the muculocutaneous nerve is best done with arm abducted allowing convenient access to the axilla with an in-plane approach.  The nerve is easily identified 1-2 cm cephalad to the axillary nerves and vessels.