The axillary nerve gets its name from the axilla, which is the medical name for the armpit.
You have two, one on each side (as you do with most nerves.)
It winds backward and travels down the arm along the posterior humeral circumflex artery.
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This gap provides space for nerves and blood vessels to pass through to the arm.
Variations in the axillary nerve appear to be somewhat rare.
It also had a communicating branch to the posterior cord.
Motor Function
As a motor nerve, the axillary nerve innervates three muscles in the arm.
A difference in the range of motion between your shoulders is suggestive of a nerve injury.
To further verify nerve palsy, you may be sent for electromyography and a nerve conduction study.
A major goal is preventing joint stiffness, as that can impair your long-term function.
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