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CRANIAL NERVES

CRANIAL NERVES. III, V, VII, IX, X. Parasympathetic Cranial Nerves. Oculomotor (III) Facial (VII) Glossopharyngeal (IX) Vagus (X). Oculomotor Nerve. Modalities: GSM: From: Oculomotor complex. To: 4 of 6 extrinsic muscles of the eye. Levator palpebrae superioris.

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CRANIAL NERVES

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  1. CRANIAL NERVES III, V, VII, IX, X

  2. Parasympathetic Cranial Nerves • Oculomotor (III) • Facial (VII) • Glossopharyngeal (IX) • Vagus (X)

  3. Oculomotor Nerve • Modalities: GSM: From: Oculomotor complex. To: 4 of 6 extrinsic muscles of the eye. Levator palpebrae superioris.

  4. Oculomotor Nerve • Modalities: GVM: Preganglionics: From: Edinger-Westphal nucleus. To: Ciliary ganglion. Postganglionics: To: Sphincter pupillae.

  5. Trigeminal Nerve • Three branches: Ophthalmic. Maxillary. Mandibular. • Major sensory nerve to face. (Also supplies tongue, but this is general sensory, not special sensory for taste.) • Motor to muscles of mastication: Muscles derived from first pharyngeal arch (mandibular arch).

  6. Trigeminal Nerve • Not parasympathetic. • Modalities: SVM: From: Masticator nucleus. To: Muscles of mastication. Tensor veli palatini. Tensor tympani. Mylohyoid. Anterior belly of digastric.

  7. Trigeminal Nerve • Modalities: GSS: Cell bodies of sensory neurons in trigeminal (semilunar) ganglion. Sensory to: Face and anterior scalp. Conjunctiva and eyeball. Paranasal sinuses. Nasal and oral cavities. Anterior 2/3 of tongue. External surface of ear drum. Dura of middle and anterior cranial fossae.

  8. Facial Nerve • Primary motor nerve to muscles of facial expression. Supplies muscles derived from second pharyngeal arch (hyoid arch). Branches: Temporal. Zygomatic. Buccal. Mandibular. Cervical.

  9. Facial Nerve • Carries taste from anterior 2/3 of tongue. • Carries motor to submandibular and sublingual salivary glands. • Carries motor to lacrimal gland and mucous glands in nose.

  10. Facial Nerve • Modalities: GVM: Preganglionics: From: Superior salivatory and lacrimal nuclei. To: Submandibular/sublingual ganglia.

  11. Facial Nerve • Modalities: GVM: Postganglionics: To: Lacrimal gland. Submandibular gland. Sublingual gland. Mucous glands of mouth and nose.

  12. Facial Nerve • Modalities: GSS: Cell bodies of sensory neurons in geniculate ganglion. Supplies sensory to part of external ear.

  13. Facial Nerve • Modalities: SVS: Cell bodies of sensory neurons in geniculate ganglion. Carries taste from anterior 2/3 of tongue. Carries taste from hard and soft palates.

  14. Glossopharyngeal Nerve • Motor to parotid gland. • Carries taste from posterior 1/3 of tongue. • Supplies general sensation to posterior 1/3 of tongue. • Supplies muscles derived from third pharyngeal arch.

  15. Glossopharyngeal Nerve • Modalities: SVM: From: Nucleus ambiguous. To: Stylopharyngeus.

  16. Glossopharyngeal Nerve • Modalities: GVS: From: Carotid body. Carotid sinus.

  17. Glossopharyngeal Nerve • Modalities: GVM: Preganglionics: From: Inferior salivatory nucleus. To: Otic ganglion. Postganglionics: To: Parotid gland.

  18. Glossopharyngeal Nerve • Modalities: GSS: From: Posterior 1/3 of tongue. External ear. Middle ear cavity.

  19. Glossopharyngeal Nerve • Modalities: SVS: From: Posterior 1/3 of tongue (taste).

  20. Vagus Nerve • Motor to muscles of larynx: Muscles of fourth and fifth pharyngeal arches. Important in swallowing and speaking. • Major parasympathetic nerve to thoracic and abdominal organs: Parasympathetic supply distally to left colic (splenic) flexure.

  21. Vagus Nerve • Modalities: SVM: From: Nucleus ambiguous. To: Almost all muscles of pharynx and larynx.

  22. Vagus Nerve • Modalities: GVS: From: Larynx and pharynx. Thoracic and abdominal viscera. GSS: From external ear and pharynx.

  23. Vagus Nerve • Modalities: GVM: Preganglionics: From: Dorsal motor nucleus. To: Myenteric plexus of wall of gut tube.

  24. Vagus Nerve • Modalities: GVM: Postganglionics: Smooth muscle of pharynx and larynx. Smooth muscle of most of wall of gut tube.

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