The true axilla is a conical space with its apex at the Cervico-axillary Canal, Base at the axillary fascia and skin of the armpit.

It is a quadrangular space bounded laterally by surgical neck of the humerus, medially by long head of triceps brachii and inferiorly by teres major.

It is bounded superiorly by subscapularis in front, capsule of the shoulder joint in the middle, and behind by teres minor.

The axillary nerve and posterior humeral circumflex artery and vein pass through this space.

The radial nerve and profunda brachii artery and vein passes through this space.