Lab 1 Module 3: Posterior Triangle of the Neck - Page 3 of 5

Nerves of the Posterior Triangle

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Review the roots of the Brachial Plexus (ventral rami of C5-T1) lies in the posterior triangle immediately posterior to the anterior scalene and anterior to the middle scalene..

Add the Spinal Accessory Nerve (CN XI) divides the posterior triangle into nearly equal superior and inferior parts. The superior part contains only the lesser occipital nerve while the inferior part contains many important nerves. Spinal Accessory nerve is a motor nerve comprised of spinal and cranial roots.