Relationship To Vagus
As the fibers from the presumptive cranial root may not join the accessory nerve at all or at best for a very short distance within the jugular foramen, it appears more useful to consider them in general to be part of the cranial roots of the vagal nerve. The accessory nerve would then be a pure motor nerve supplying the trapezius and sternocleidomastoid muscles, with the fibers originating from the spinal segments C1-C5 (the medullary root of the accessory nerve).
Read more about this topic: Cranial Root Of Accessory Nerves
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