The nerves and arteries of the deep layers of the neck and of the axilla. (Sixth layer of neck, deeper layer of the axilla.) The greater portions of the infra-hyoid muscles and of the common carotid artery have been removed; the clavicle has been disarticulated at the sternoclavicular joint and sawn through at about its middle. The pectoralis major and minor have been divided and the deltoid incised along the deltoid branch of the thoraco-acromial artery. * = Accessory sympathetic nerve.