The axilla is an irregularly shaped pyramidal area formed by
muscles and bones of the shoulder and the lateral surface of the thoracic wall.
The apex or inlet opens directly into the lower portion of the neck. The skin
of the 'armpit' forms the floor. All major structures that pass between the neck
and arm pass through the axilla.
The cubital fossa is a triangularly shaped depression formed
by muscles anterior to the elbow joint. The brachial artery and the median
nerve pass from the arm to the forearm through this fossa.
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