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glossopharyngeal nerve (CN IX)

Somatic & visceral motor; somatic & visceral sensory. Efferents: Nucleus ambiguous 1) located in the rostral medulla anterior to the nucleus solitarius 2) CN 9 fibers originating in the nucleus ambiguous innervates the stylopharyngeus - swallowing 3) the nucleus ambiguous is shared by CN 9 & CN 10 Inferior salivary nucleus 1) located in the posterior rostral medulla medial to the nucleus solitarius 2) CN 9 fibers originating in the inferior salivary nucleus innervates the parotid gland with relay in the otic ganglion Afferents: Nucleus solitarius 1) located in the posterior rostral medulla lateral to the inferior salivary nucleus 2) visceral sensory 3) CN 9 fibers synapsing in the nucleus solitarius innervate: a) posterior 1/3 of tongue - taste b) carotid body c) carotid sinus 6) nucleus solitarius is shared by CN 7, CN 9, CN 10 Spinal nucleus of CN 5 1) the sensory nucleus of CN 5 actually obtains sensory input from CN 7, 9, & 10, but because of the dominant input from CN 5, retains it name 2) CN 9 fibers synapsing in the spinal nucleus of CN 5 innervate: a) external ear b) posterior 1/3 of tongue Course: - exits from the cranium through the jugular foramen

Related

carotid body carotid sinus; carotid bulb inferior salivary nucleus jugular foramen nucleus ambiguous nucleus solitarius spinal (caudal) trigeminal nucleus

Useful

glossopharyngeal neuralgia

General

cranial nerve

References

  1. Clinical Anatomy Made Ridiculously Simple. Stephen Goldberg, MedMaster Inc, Miami, 1995
  2. Medical Knowledge Self Assessment Program (MKSAP) 11, American College of Physicians, Philadelphia 1998

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