Axilla Boundaries
A Pyramid-shaped space bounded by anterior, posterior, medial, lateral, superior, and inferior walls. The anterior wall is formed by the pectoral muscles, the posterior wall by the subscapularis, teres major, and latissimus dorsi muscles, and the lateral wall by the humerus. The medial wall consists of the serratus anterior and thoracic wall, while the base is the skin and fascia of the armpit. The apex is the open, superior part, defined by the first rib, clavicle, and scapula.