What are the anatomic landmarks of the axilla?

What are the anatomic landmarks of the axilla?

The axilla is a pyramidal structure consisting of an apex and base and surrounded on all four sides by different anatomic landmarks. The clavicle makes up the apex of the axilla, and its base is the concave armpit. The anterior wall consists of the pectoralis muscles. The posterior wall embodies the scapula and scapular muscles, the subscapu-laris, and teres major. The median wall is made up of the serratus anterior muscle and the humerus comprises the lateral wall, along with its surrounding muscles and tendons.