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Gross Anatomy: Cranial Nerve Introduction (Grays, pages 807; 848-854)

Gross Anatomy: Cranial Nerve Introduction (Grays, pages 807; 848-854). CNS. Vocabulary REVIEW Afferent: sensory primary afferents axons entering the CNS cell bodies in sensory ganglia CN versus spinal nerves Efferent: motor leaving the CNS innervate skeletal muscle or viscera

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Gross Anatomy: Cranial Nerve Introduction (Grays, pages 807; 848-854)

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  1. Gross Anatomy:Cranial Nerve Introduction(Grays, pages 807; 848-854)

  2. CNS Vocabulary REVIEW • Afferent: • sensory • primary afferents • axons entering the CNS • cell bodies in sensory ganglia • CN versus spinal nerves • Efferent: • motor • leaving the CNS • innervate skeletal muscle or viscera • visceral efferent pathways always involve 2 neurons [one in the CNS and one in a peripheral ganglia]

  3. Functional Components • Special – cranial nerves only; olfaction, vision, taste, balance and hearing • General – touch, pressure, proprioception, vibration, pain and temperature • Somatic – body wall • Visceral – smooth and cardiac muscle, glands and arrectorpili General Somatic Afferent (GSA): sensation from body wall General Visceral Afferent (GVA): sensation from viscera Special Visceral Afferent (SVA): taste and olfaction Special Somatic Afferent (SSA): DON’T NEED TO KNOW YET General Somatic Efferent (GSE): motor; to skeletal muscle General Visceral Efferent (GVE): motor to “viscera” Branchial Efferents (BE [SVE]): motor (skeletal muscle from pharyngeal arches)

  4. CRANIAL NERVE SUMMARY 1. Olfactory CN I (SVA) Sensory 2. Optic CN II (SSA) Sensory 3. Oculomotor CN III (GSE, GVE-P) Motor 4. Trochlear CN IV (GSE) Motor 5. Trigeminal CN V (GSA, BE) Both 6. Abducens CN VI (GSE) Motor 7. Facial CN VII (BE, GSA, SVA, GVA,GVE-P) Both 8. Vestibulocochlear CN VIII (SSA, SSE) Sensory 9. Glossopharyngeal CN IX (BE, GSA, SVA, GVA, GVE-P) Both 10. Vagus CN X (BE, GSA, SVA, GVA, GVE-P) Both 11. Accessory CN XI (GSE) Motor 12. Hypoglossal CN XII (GSE) Motor

  5. Cranial Nerves along the Cranial Fossa Olfactory Optic Oculomotor Trochlear Trigeminal Abducens Facial Vestibulocochlear Glossopharyngeal Vagus Accessory Hypoglossal

  6. 12 Cranial Nerves:

  7. To the “intra” and extraocular muscles: CN III – Oculomotor CN IV – Trochlear CN VI - Abducens

  8. Brain stem (CNS)

  9. Brain stem (CNS)

  10. Brain stem (CNS)

  11. CN V - Trigeminal

  12. Ophthalmic Maxillary CN V - Trigeminal Nerve NOTE: The mesencephalic nucleus is involved in proprioception from muscles of mastication, the TMJ, extraocular muscles and muscles of the face.

  13. CN V - Trigeminal

  14. CN V1 - Ophthalmic

  15. CN V2 - Maxillary

  16. CN V3 - Mandibular

  17. CN VII - Facial

  18. CN VII - Facial Nerve

  19. CN VII - Facial

  20. Cranial Nerve VII

  21. CN IX – Glossopharyngeal CN X - Vagus

  22. CN IX - Glossopharyngeal

  23. CN IX - Glossopharyngeal

  24. CN X - Vagus Nerve

  25. CN X - Vagus Nerve

  26. CN XI – Spinal Accessory CN XII - Hypoglossal

  27. CN XI - Spinal Accessory

  28. CN XII - Hypoglossal

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