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Laboratory 3. Scapular Region
Step 4. Quadrangular Space of Scapular Region

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The axillary nerve and posterior humeral circumflex artery pass through a four-sided space, called the quadrangular space. Define the borders of the quadrangular space:
In fractures of the surgical neck of the humerus, the axillary nerve is prone to injury because it is closely associated with the bone.

Links and References:
Grant's: 6.40 and 6.41
Netter (1ed.): 401 (2ed.): 397
Rohen and Yokochi: 380 and 383