Axillary Nerve

Saturday, December 3, 2011

Originating from the posterior cord of the brachial plexus, the axillary nerve runs deep inside the axilla and across the capsule of the shoulder joint around the surgical neck on the back of the humerus. It passes through the lateral axillary gap and extends beneath the deltoid muscle to the anterior margin of the latter. Before the axillary nerve trunk passes through the lateral axillary gap, it gives off a motor branch to the teres minor muscle, which also passes through the lateral axillary gap. The axillary nerve supplies the teres minor and the deltoid muscles, as well as the shoulder skin.