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 eye muscles muscles
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 the face; motor fibers to chewing muscles
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

6. PNS: Cranial Nerves taste; motor fibers to the pharynx
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

9. Table 7.1 (3 of 4)

11. PNS: Distribution of Cranial Nerves
Figure 7.24

12. 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

13. 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

14. 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

15. 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

16. 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

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

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

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

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

21. PNS: Distribution of Cranial Nerves
Figure 7.24

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

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

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

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

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

32. PNS: Distribution of Cranial Nerves
Figure 7.24

33. 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

34. 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

35. 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

36. 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

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

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

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

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

41. PNS: Distribution of Cranial Nerves
Figure 7.24