Axilla

The axilla (armpit, underarm) is the area directly inferior to the glenohumeral joint where the arm joins the shoulder. The axilla contains many structures, including:

• Axillary a. and its branches

• Axillary v. and its tributaries

• Infraclavicular part of the brachial nerve plexus

• Five groups of axillary lymph nodes and their associated lymphatics

• Long thoracic n. and intercostobrachial n.

• Axillary fat and areolar tissue in which the other contents are embedded