The Quadrangular Space is a space in the shoulder through which the axillary nerve, the posterior humeral circumflex artery and accompanying veins pass. Four muscles define the posterior edges of the space; teres minor on top, the teres major on the bottom, the long head of the triceps toward the spine, and the lateral head of the triceps away from the spine.
Sources
Netter, Frank H. "Atlas of Human Anatomy", ICON Learning Systems, 2004. ISBN 1-929007-11-6 ; plate 409
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