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Peripheral Nervous System Classification of Nerves.

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Presentation on theme: "Peripheral Nervous System Classification of Nerves."— Presentation transcript:

1 Peripheral Nervous System Classification of Nerves

2 Mixed nerves Mixed nerves Both sensory and motor fibersBoth sensory and motor fibers Sensory nerves Sensory nerves Carry impulses toward the CNSCarry impulses toward the CNS Motor nerves Motor nerves Carry impulses away from the CNSCarry impulses away from the CNS CNS = Central Nervous System (brain and spinal chord) and spinal chord)

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

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

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

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

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9 Table 7.1 (3 of 4)

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11 PNS: Distribution of Cranial Nerves Figure 7.24

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

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

14 PNS: Cranial Nerves I Olfactory nervesensory for smell I Olfactory nervesensory for smell II Optic nervesensory for vision II Optic nervesensory for vision III Oculomotor nervemotor fibers to eye muscles III Oculomotor nervemotor fibers to eye muscles IV Trochlearmotor fiber to eye muscles IV Trochlearmotor fiber to eye muscles

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

16 PNS: Cranial Nerves IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera XI Accessory nervemotor fibers to neck and upper back XI Accessory nervemotor fibers to neck and upper back XII Hypoglossal nervemotor fibers to tongue XII Hypoglossal nervemotor 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 Mixed nerves Both sensory and motor fibersBoth sensory and motor fibers Sensory (afferent) nerves Sensory (afferent) nerves Carry impulses toward the CNSCarry impulses toward the CNS Motor (efferent) nerves Motor (efferent) nerves Carry impulses away from the CNSCarry impulses away from the CNS

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

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

25 PNS: Cranial Nerves I Olfactory nervesensory for smell I Olfactory nervesensory for smell II Optic nervesensory for vision II Optic nervesensory for vision III Oculomotor nervemotor fibers to eye muscles III Oculomotor nervemotor fibers to eye muscles IV Trochlearmotor fiber to eye muscles IV Trochlearmotor fiber to eye muscles

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

27 PNS: Cranial Nerves IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera XI Accessory nervemotor fibers to neck and upper back XI Accessory nervemotor fibers to neck and upper back XII Hypoglossal nervemotor fibers to tongue XII Hypoglossal nervemotor 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 12 pairs of nerves that mostly serve the head and neck Only the pair of vagus nerves extend to thoracic and abdominal cavities Only the pair of vagus nerves extend to thoracic and abdominal cavities Most are mixed nerves, but three are sensory only Most are mixed nerves, but three are sensory only

34 PNS: Cranial Nerves I Olfactory nervesensory for smell I Olfactory nervesensory for smell II Optic nervesensory for vision II Optic nervesensory for vision III Oculomotor nervemotor fibers to eye muscles III Oculomotor nervemotor fibers to eye muscles IV Trochlearmotor fiber to eye muscles IV Trochlearmotor fiber to eye muscles

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

36 PNS: Cranial Nerves IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx IX Glossopharyngeal nervesensory for taste; motor fibers to the pharynx X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera X Vagus nervessensory and motor fibers for pharynx, larynx, and viscera XI Accessory nervemotor fibers to neck and upper back XI Accessory nervemotor fibers to neck and upper back XII Hypoglossal nervemotor fibers to tongue XII Hypoglossal nervemotor 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


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