Right armpit nerve plexus. Artwork of the nerves (yellow), arteries (red), muscles (red-brown) and bones (light brown) of the right armpit, seen from the front. The bone running across centre is the clavicle. Below it is the subclavian muscle (brown) and the subclavian artery (red). The three muscles across bottom are (left to right): the deltoid, pectoralis minor, and pectoralis major. This is the region where an axillary nerve block is applied. For the left armpit, see C016/6812.