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Laboratory 24. Posterolateral Triangle of the Neck
Step 12. Nerves of the Brachial Plexus in the Posterolateral Triangle

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Identify the long thoracic nerve, suprascapular nerve, and dorsal scapular nerve. The long thoracic nerve (C5, C6, C7) descends posterior to the brachial plexus and the subclavian vessels to supply the serratus anterior muscle. The suprascapular nerve (C5, C6) arises from the upper trunk of the brachial plexus and runs posteriorly toward the scapular region to supply the supraspinatus and infraspinatus muscles. The dorsal scapular nerve arises from the C5 spinal nerve and pierces the scalenus medius muscle. It passes posteriorly to supply the levator scapulae and rhomboid muscles.

Links and References:
Grant's: 8.4
Netter:22
Rohen/Yokochi: 178