Neuroanatomy

Nucleus ambiguus

Cranial root of accessory nerve (joins vagus nerve and via recurrent laryngeal nerve supplies muscles of larynx, except cricothyroid)*

Jugular foramen

Nucleus ambiguus

Cranial root of accessory nerve (joins vagus nerve and via recurrent laryngeal nerve supplies muscles of larynx, except cricothyroid)*

Jugular foramen

Superior ganglion of vagus nerve

Accessory nerve (XI)*

Inferior ganglion of vagus nerve

C1 spinal nerve

C2 spinal nerve

C3 spinal nerve

C4 spinal nerve

Jugular Foramen

Efferent fibers Proprioceptive fibers

Superior ganglion of vagus nerve

Accessory nerve (XI)*

Inferior ganglion of vagus nerve

C1 spinal nerve

C2 spinal nerve

Accessory nerve

(to sternocleidomastoid and trapezius muscles)

Sternocleidomastoid muscle (cut)

C3 spinal nerve

C4 spinal nerve

Trapezius muscle

Efferent fibers Proprioceptive fibers

*Recent evidence suggests that the accessory nerve lacks a cranial root and has no connection to the vagus nerve. Verification of this finding awaits further investigation.

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