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Laboratory 24. Posterolateral Triangle of the Neck
Step 10. Trunks of the Brachial Plexus

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Between the scalenus anterior muscle and scalenus medius muscle, identify the trunks (upper, middle, and lower) of the brachial plexus.

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