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Peripheral Nervous System

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  1. Peripheral Nervous System Classification of Nerves

  2. Classification of Nerves • Mixed nerves • Both sensory and motor fibers • Sensory nerves • Carry impulses toward the CNS • Motor nerves • Carry impulses away from the CNS CNS = Central Nervous System (brain and spinal chord)

  3. Cranial Nerves • 12 pairs of nerves that mostly serve the head and neck • Only the pair of vagus nerves extend to thoracic and abdominal cavities • Most are mixed nerves, but three are sensory only

  4. PNS: Cranial Nerves • I Olfactory nerve — sensory for smell • II Optic nerve — sensory for vision • III Oculomotor nerve — motor fibers to eye muscles • IV Trochlear — motor fiber to eye muscles

  5. PNS: Cranial Nerves • VTrigeminal nerve — sensory for the face; motor fibers to chewing muscles • VIAbducens nerve — motor fibers to eye muscles • VIIFacial nerve — sensory for taste; motor fibers to the face • VIIIVestibulocochlear nerve — sensory for balance and hearing

  6. PNS: Cranial Nerves • IXGlossopharyngeal nerve — sensory for taste; motor fibers to the pharynx • XVagus nerves — sensory and motor fibers for pharynx, larynx, and viscera • XIAccessory nerve — motor fibers to neck and upper back • XIIHypoglossal nerve — motor fibers to tongue

  7. Table 7.1 (3 of 4)

  8. PNS: Distribution of Cranial Nerves Figure 7.24

  9. PNS: Classification of Nerves • Mixed nerves • Both sensory and motor fibers • Sensory (afferent) nerves • Carry impulses toward the CNS • Motor (efferent) nerves • Carry impulses away from the CNS

  10. PNS: Cranial Nerves • 12 pairs of nerves that mostly serve the head and neck • Only the pair of vagus nerves extend to thoracic and abdominal cavities • Most are mixed nerves, but three are sensory only

  11. PNS: Cranial Nerves • I Olfactory nerve—sensory for smell • II Optic nerve—sensory for vision • III Oculomotor nerve—motor fibers to eye muscles • IV Trochlear—motor fiber to eye muscles

  12. PNS: Cranial Nerves • V Trigeminal nerve—sensory for the face; motor fibers to chewing muscles • VI Abducens nerve—motor fibers to eye muscles • VII Facial nerve—sensory for taste; motor fibers to the face • VIII Vestibulocochlear nerve—sensory for balance and hearing

  13. PNS: Cranial Nerves • IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx • X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera • XI Accessory nerve—motor fibers to neck and upper back • XII Hypoglossal nerve—motor fibers to tongue

  14. PNS: The Cranial Nerves Table 7.1 (1 of 4)

  15. PNS: The Cranial Nerves Table 7.1 (2 of 4)

  16. PNS: The Cranial Nerves Table 7.1 (3 of 4)

  17. PNS: The Cranial Nerves Table 7.1 (4 of 4)

  18. PNS: Distribution of Cranial Nerves Figure 7.24

  19. PNS: Classification of Nerves • Mixed nerves • Both sensory and motor fibers • Sensory (afferent) nerves • Carry impulses toward the CNS • Motor (efferent) nerves • Carry impulses away from the CNS

  20. PNS: Classification of Nerves • Mixed nerves • Both sensory and motor fibers • Sensory (afferent) nerves • Carry impulses toward the CNS • Motor (efferent) nerves • Carry impulses away from the CNS

  21. PNS: Cranial Nerves • 12 pairs of nerves that mostly serve the head and neck • Only the pair of vagus nerves extend to thoracic and abdominal cavities • Most are mixed nerves, but three are sensory only

  22. PNS: Cranial Nerves • I Olfactory nerve—sensory for smell • II Optic nerve—sensory for vision • III Oculomotor nerve—motor fibers to eye muscles • IV Trochlear—motor fiber to eye muscles

  23. PNS: Cranial Nerves • V Trigeminal nerve—sensory for the face; motor fibers to chewing muscles • VI Abducens nerve—motor fibers to eye muscles • VII Facial nerve—sensory for taste; motor fibers to the face • VIII Vestibulocochlear nerve—sensory for balance and hearing

  24. PNS: Cranial Nerves • IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx • X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera • XI Accessory nerve—motor fibers to neck and upper back • XII Hypoglossal nerve—motor fibers to tongue

  25. PNS: The Cranial Nerves Table 7.1 (1 of 4)

  26. PNS: The Cranial Nerves Table 7.1 (2 of 4)

  27. PNS: The Cranial Nerves Table 7.1 (3 of 4)

  28. PNS: The Cranial Nerves Table 7.1 (4 of 4)

  29. PNS: Distribution of Cranial Nerves Figure 7.24

  30. PNS: Cranial Nerves • 12 pairs of nerves that mostly serve the head and neck • Only the pair of vagus nerves extend to thoracic and abdominal cavities • Most are mixed nerves, but three are sensory only

  31. PNS: Cranial Nerves • I Olfactory nerve—sensory for smell • II Optic nerve—sensory for vision • III Oculomotor nerve—motor fibers to eye muscles • IV Trochlear—motor fiber to eye muscles

  32. PNS: Cranial Nerves • V Trigeminal nerve—sensory for the face; motor fibers to chewing muscles • VI Abducens nerve—motor fibers to eye muscles • VII Facial nerve—sensory for taste; motor fibers to the face • VIII Vestibulocochlear nerve—sensory for balance and hearing

  33. PNS: Cranial Nerves • IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynx • X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscera • XI Accessory nerve—motor fibers to neck and upper back • XII Hypoglossal nerve—motor fibers to tongue

  34. PNS: The Cranial Nerves Table 7.1 (1 of 4)

  35. PNS: The Cranial Nerves Table 7.1 (2 of 4)

  36. PNS: The Cranial Nerves Table 7.1 (3 of 4)

  37. PNS: The Cranial Nerves Table 7.1 (4 of 4)

  38. PNS: Distribution of Cranial Nerves Figure 7.24

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