Peripheral Nervous SystemPeripheral Nervous System
Classification of NervesClassification of Nerves
Classification of NervesClassification of Nerves
Mixed nervesMixed nerves• Both sensory and motor fibersBoth sensory and motor fibers
Sensory nervesSensory nerves• Carry impulses toward the CNSCarry impulses toward the CNS
Motor nervesMotor nerves• Carry impulses away from the CNSCarry impulses away from the CNS
CNS = Central Nervous System (brain CNS = Central Nervous System (brain
and spinal chord)and spinal chord)
Cranial NervesCranial Nerves
12 pairs of nerves that mostly serve 12 pairs of nerves that mostly serve the head and neckthe head and neck
Only the pair of vagus nerves extend Only the pair of vagus nerves extend to thoracic and abdominal cavitiesto thoracic and abdominal cavities
Most are mixed nerves, but three are Most are mixed nerves, but three are sensory onlysensory only
PNS: Cranial NervesPNS: Cranial Nerves
II Olfactory nerve Olfactory nerve — sensory for smell — sensory for smell IIII Optic nerve Optic nerve — sensory for vision — sensory for vision IIIIII Oculomotor nerve Oculomotor nerve — motor fibers to — motor fibers to
eye muscleseye muscles IVIV Trochlear Trochlear — motor fiber to eye — motor fiber to eye
musclesmuscles
PNS: Cranial NervesPNS: Cranial Nerves VV Trigeminal nerveTrigeminal nerve — sensory for — sensory for
the face; motor fibers to chewingthe face; motor fibers to chewing
musclesmuscles VIVI Abducens nerveAbducens nerve — motor fibers to — motor fibers to
eye muscleseye muscles VIIVII Facial nerveFacial nerve — sensory for taste; — sensory for taste;
motor fibers to the facemotor fibers to the face VIIIVIII Vestibulocochlear nerveVestibulocochlear nerve — —
sensory for balance and hearingsensory for balance and hearing
PNS: Cranial NervesPNS: Cranial Nerves
IXIX Glossopharyngeal nerveGlossopharyngeal nerve — sensory for — sensory for
taste; motor fibers to the pharynxtaste; motor fibers to the pharynx XX Vagus nervesVagus nerves — sensory and motor — sensory and motor
fibers for pharynx, larynx, and viscerafibers for pharynx, larynx, and viscera XIXI Accessory nerveAccessory nerve — motor fibers to — motor fibers to
neck and upper backneck and upper back XIIXII Hypoglossal nerveHypoglossal nerve — motor fibers to — motor fibers to
tonguetongue
Table 7.1 (3 of 4)
PNS: PNS: Distribution Distribution of Cranial of Cranial
NervesNerves
Figure 7.24
PNS: Classification of NervesPNS: Classification of Nerves
Mixed nervesMixed nerves• Both sensory and motor fibersBoth sensory and motor fibers
Sensory (afferent) nervesSensory (afferent) nerves• Carry impulses toward the CNSCarry impulses toward the CNS
Motor (efferent) nervesMotor (efferent) nerves• Carry impulses away from the CNSCarry impulses away from the CNS
PNS: Cranial NervesPNS: Cranial Nerves
12 pairs of nerves that mostly serve 12 pairs of nerves that mostly serve the head and neckthe head and neck
Only the pair of vagus nerves extend Only the pair of vagus nerves extend to thoracic and abdominal cavitiesto thoracic and abdominal cavities
Most are mixed nerves, but three are Most are mixed nerves, but three are sensory onlysensory only
PNS: Cranial NervesPNS: Cranial Nerves
I Olfactory nerve—sensory for smellI Olfactory nerve—sensory for smell II Optic nerve—sensory for visionII Optic nerve—sensory for vision III Oculomotor nerve—motor fibers to III Oculomotor nerve—motor fibers to
eye muscleseye muscles IV Trochlear—motor fiber to eye IV Trochlear—motor fiber to eye
musclesmuscles
PNS: Cranial NervesPNS: Cranial Nerves
V Trigeminal nerve—sensory for the V Trigeminal nerve—sensory for the face; motor fibers to chewing musclesface; motor fibers to chewing muscles
VI Abducens nerve—motor fibers to VI Abducens nerve—motor fibers to eye muscleseye muscles
VII Facial nerve—sensory for taste; VII Facial nerve—sensory for taste; motor fibers to the facemotor fibers to the face
VIII Vestibulocochlear nerve—sensory VIII Vestibulocochlear nerve—sensory for balance and hearingfor balance and hearing
PNS: Cranial NervesPNS: Cranial Nerves
IX Glossopharyngeal nerve—sensory IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynxfor taste; motor fibers to the pharynx
X Vagus nerves—sensory and motor X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscerafibers for pharynx, larynx, and viscera
XI Accessory nerve—motor fibers to XI Accessory nerve—motor fibers to neck and upper backneck and upper back
XII Hypoglossal nerve—motor fibers to XII Hypoglossal nerve—motor fibers to tonguetongue
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (1 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (2 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (3 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (4 of 4)
PNS: Distribution of Cranial PNS: Distribution of Cranial NervesNerves
Figure 7.24
PNS: Classification of NervesPNS: Classification of Nerves
Mixed nervesMixed nerves• Both sensory and motor fibersBoth sensory and motor fibers
Sensory (afferent) nervesSensory (afferent) nerves• Carry impulses toward the CNSCarry impulses toward the CNS
Motor (efferent) nervesMotor (efferent) nerves• Carry impulses away from the CNSCarry impulses away from the CNS
PNS: Classification of NervesPNS: Classification of Nerves
Mixed nervesMixed nerves• Both sensory and motor fibersBoth sensory and motor fibers
Sensory (afferent) nervesSensory (afferent) nerves• Carry impulses toward the CNSCarry impulses toward the CNS
Motor (efferent) nervesMotor (efferent) nerves• Carry impulses away from the CNSCarry impulses away from the CNS
PNS: Cranial NervesPNS: Cranial Nerves
12 pairs of nerves that mostly serve 12 pairs of nerves that mostly serve the head and neckthe head and neck
Only the pair of vagus nerves extend Only the pair of vagus nerves extend to thoracic and abdominal cavitiesto thoracic and abdominal cavities
Most are mixed nerves, but three are Most are mixed nerves, but three are sensory onlysensory only
PNS: Cranial NervesPNS: Cranial Nerves
I Olfactory nerve—sensory for smellI Olfactory nerve—sensory for smell II Optic nerve—sensory for visionII Optic nerve—sensory for vision III Oculomotor nerve—motor fibers to III Oculomotor nerve—motor fibers to
eye muscleseye muscles IV Trochlear—motor fiber to eye IV Trochlear—motor fiber to eye
musclesmuscles
PNS: Cranial NervesPNS: Cranial Nerves
V Trigeminal nerve—sensory for the V Trigeminal nerve—sensory for the face; motor fibers to chewing musclesface; motor fibers to chewing muscles
VI Abducens nerve—motor fibers to VI Abducens nerve—motor fibers to eye muscleseye muscles
VII Facial nerve—sensory for taste; VII Facial nerve—sensory for taste; motor fibers to the facemotor fibers to the face
VIII Vestibulocochlear nerve—sensory VIII Vestibulocochlear nerve—sensory for balance and hearingfor balance and hearing
PNS: Cranial NervesPNS: Cranial Nerves
IX Glossopharyngeal nerve—sensory IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynxfor taste; motor fibers to the pharynx
X Vagus nerves—sensory and motor X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscerafibers for pharynx, larynx, and viscera
XI Accessory nerve—motor fibers to XI Accessory nerve—motor fibers to neck and upper backneck and upper back
XII Hypoglossal nerve—motor fibers to XII Hypoglossal nerve—motor fibers to tonguetongue
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (1 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (2 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (3 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (4 of 4)
PNS: Distribution of Cranial PNS: Distribution of Cranial NervesNerves
Figure 7.24
PNS: Cranial NervesPNS: Cranial Nerves
12 pairs of nerves that mostly serve 12 pairs of nerves that mostly serve the head and neckthe head and neck
Only the pair of vagus nerves extend Only the pair of vagus nerves extend to thoracic and abdominal cavitiesto thoracic and abdominal cavities
Most are mixed nerves, but three are Most are mixed nerves, but three are sensory onlysensory only
PNS: Cranial NervesPNS: Cranial Nerves
I Olfactory nerve—sensory for smellI Olfactory nerve—sensory for smell II Optic nerve—sensory for visionII Optic nerve—sensory for vision III Oculomotor nerve—motor fibers to III Oculomotor nerve—motor fibers to
eye muscleseye muscles IV Trochlear—motor fiber to eye IV Trochlear—motor fiber to eye
musclesmuscles
PNS: Cranial NervesPNS: Cranial Nerves
V Trigeminal nerve—sensory for the V Trigeminal nerve—sensory for the face; motor fibers to chewing musclesface; motor fibers to chewing muscles
VI Abducens nerve—motor fibers to VI Abducens nerve—motor fibers to eye muscleseye muscles
VII Facial nerve—sensory for taste; VII Facial nerve—sensory for taste; motor fibers to the facemotor fibers to the face
VIII Vestibulocochlear nerve—sensory VIII Vestibulocochlear nerve—sensory for balance and hearingfor balance and hearing
PNS: Cranial NervesPNS: Cranial Nerves
IX Glossopharyngeal nerve—sensory IX Glossopharyngeal nerve—sensory for taste; motor fibers to the pharynxfor taste; motor fibers to the pharynx
X Vagus nerves—sensory and motor X Vagus nerves—sensory and motor fibers for pharynx, larynx, and viscerafibers for pharynx, larynx, and viscera
XI Accessory nerve—motor fibers to XI Accessory nerve—motor fibers to neck and upper backneck and upper back
XII Hypoglossal nerve—motor fibers to XII Hypoglossal nerve—motor fibers to tonguetongue
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (1 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (2 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (3 of 4)
PNS: The Cranial NervesPNS: The Cranial Nerves
Table 7.1 (4 of 4)
PNS: Distribution of Cranial PNS: Distribution of Cranial NervesNerves
Figure 7.24
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