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posterior circumflex humeral artery in quadrangular space
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Forward
The axillary nerve and the posterior circumflex artery can be located within the quadrangular space. The axillary nerve innervates the deltoid and teres minor.
The test for the axillary nerve involves asking the patient to hold arms straight out to the sides and resist a force pushing them downward (primarily testing the deltoid). Note that the abducting capability the arm will also be weak with a paralyzed supraspinatus.
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