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Peripheral Nervous System. Classification of Nerves. 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

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peripheral nervous system

Peripheral Nervous System

Classification of Nerves

classification of nerves
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)

cranial nerves
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
pns cranial nerves
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

pns cranial nerves1
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

pns cranial nerves2
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

pns classification of nerves
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
pns cranial nerves3
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
pns cranial nerves4
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
pns cranial nerves5
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
pns cranial nerves6
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
pns the cranial nerves
PNS: The Cranial Nerves

Table 7.1 (1 of 4)

pns the cranial nerves1
PNS: The Cranial Nerves

Table 7.1 (2 of 4)

pns the cranial nerves2
PNS: The Cranial Nerves

Table 7.1 (3 of 4)

pns the cranial nerves3
PNS: The Cranial Nerves

Table 7.1 (4 of 4)

pns classification of nerves1
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
pns classification of nerves2
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
pns cranial nerves7
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
pns cranial nerves8
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
pns cranial nerves9
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
pns cranial nerves10
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
pns the cranial nerves4
PNS: The Cranial Nerves

Table 7.1 (1 of 4)

pns the cranial nerves5
PNS: The Cranial Nerves

Table 7.1 (2 of 4)

pns the cranial nerves6
PNS: The Cranial Nerves

Table 7.1 (3 of 4)

pns the cranial nerves7
PNS: The Cranial Nerves

Table 7.1 (4 of 4)

pns cranial nerves11
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
pns cranial nerves12
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
pns cranial nerves13
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
pns cranial nerves14
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
pns the cranial nerves8
PNS: The Cranial Nerves

Table 7.1 (1 of 4)

pns the cranial nerves9
PNS: The Cranial Nerves

Table 7.1 (2 of 4)

pns the cranial nerves10
PNS: The Cranial Nerves

Table 7.1 (3 of 4)

pns the cranial nerves11
PNS: The Cranial Nerves

Table 7.1 (4 of 4)