Axillary sheathsurroundingarteries, veins, nerves, and lymphaticsApex of inletInletAxillaSkin of armSkin on floor of axillaPosterior wall• Subscapularis,   teres major, and   latissimus dorsi   muscles, and   long head of triceps  brachii muscleLateral wall• Intertubercular   sulcusInlet• Lateral margin of rib I• Clavicle• Superior margin of    scapula to coracoid processAnterior wall• Pectoralis major and   minor muscles• Subclavius muscle• Clavipectoral fasciaMedial wall• Upper thoracic wall • Serratus anterior muscleFloor • Skin of armpit• Opens laterally into armBC