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Laboratory 1. Muscles of the Back
Step 4. Spinal Accessory Nerve (CN XI) and Transverse Cervical Vessels

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On the deep surface of the trapezius muscle, examine the spinal accessory nerve (CN XI) and the superficial branch of the transverse cervical artery and vein.

Links and References:
Grant's: 4.47
Netter:160 and 163
Rohen/Yokochi: 209