The document describes the anatomy of the axilla. The axilla is a pyramidal-shaped space located between the upper limb and trunk, with the apex directed upward towards the root of the neck. It contains fat, lymph nodes, the brachial plexus nerves and cords, axillary vessels, and other structures. The walls of the axilla are formed by bones and muscles, including the clavicle, scapula, ribs, and pectoral and latissimus muscles. Conditions affecting the axilla include shoulder dislocations, lymphadenitis, and thoracic outlet syndrome.