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Accessory Nerve (XI): Schema<br />
NEUROANATOMY<br />
SEE ALSO PLATE 28<br />
Nucleus ambiguus<br />
Vagus nerve (X)<br />
Cranial root of accessory nerve (joins vagus nerve<br />
and via recurrent laryngeal nerve supplies muscles of<br />
larynx, except cricothyroid)*<br />
Spinal root of<br />
accessory nerve<br />
Jugular foramen<br />
Foramen<br />
magnum<br />
Superior ganglion<br />
of vagus nerve<br />
Accessory nerve (XI)*<br />
Inferior ganglion<br />
of vagus nerve<br />
C1 spinal nerve<br />
C2 spinal nerve<br />
Accessory nerve<br />
(to sternocleidomastoid<br />
and trapezius muscles)<br />
Sternocleidomastoid muscle (cut)<br />
C3 spinal nerve<br />
C4 spinal nerve<br />
Trapezius muscle<br />
*Recent evidence suggests that the accessory nerve lacks a cranial root and has no connection to the vagus nerve.<br />
Verification of this finding awaits further investigation.<br />
Efferent fibers<br />
Proprioceptive fibers<br />
33
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