1. Ch. 13 Anatomy of the Nervous System … PERIPHERAL N.S.
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2. The Peripheral Nervous System Components:
Central nervous system (CNS)
Peripheral nervous system (PNS)
(1) Sensory receptors
(2) Motor endings
(3) Nerves and Ganglia
Sensory (afferent)
division
Motor (efferent) division
Somatic nervous
system
Autonomic nervous
system (ANS)
Sympathetic
division
Parasympathetic
division

3. I. Sensory Receptors & Sensation A. Sensory Receptors
1. Definition/Function

4. Sensory Receptors … 4. Classification: Chart Lab 7
a) *Location -Extero-, Intero, Proprio-ceptors
b) *Structure- encapsulated or not
c) Stimuli Received
Mechanoreceptors:
Proprioceptors (location)
*Photoreceptors:
*Chemoreceptors:
*Thermoreceptors:
*Nocireceptors:
Mechanoreceptors

5. B. Nerves 1. Structure and Classification *a. Nerve =
b. *Connective Tissue of Nerves
*Endoneurium
*Perineurium
*Epineurium
c. *Fascicle
d. *Vasa Nervorum
e. *Neurilemma
*Schwann neuron
f. *Node of Ranvier
Remember skeletal muscle:
(endomysium, perimysium, epimysium)
Figure 7.23

6. Structure and Classification … c. Classification of Nerves
Information Carried
*Mixed Nerves =
Types of fibers:
*Pure Sensory-
Pure Motor
ii. Location

7. Hypoglossal nerve (XII)
1. Cranial Nerves paired
Know: name, number, functions, and brain regions involved
Filaments of
olfactory nerve (I)
Frontal lobe
Olfactory bulb
Olfactory tract
Optic nerve (II)
Temporal lobe
Optic chiasma
Optic tract
Oculomotor
nerve (III)
Infundibulum
Facial nerve (VII)
Trochlear
nerve (IV)
Vestibulocochlear
nerve (VIII)
Trigeminal
nerve (V)
Glossopharyngeal
nerve (IX)
Abducens
nerve (VI)
Vagus nerve (X)
Cerebellum
Accessory nerve (XI)
Medulla oblongata
Hypoglossal nerve (XII)
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8. OVERVIEW Type of Nerves: - 3 all Sensory: I, II, VIII (the rest) ARE ALL MIXED RULE: if motor to muscle, then always has proprioception of 9 mostly Motor (really mixed): III Occulomotor IV Trochlear, VI Abducens XI Spinal Accessory XII Hypoglossal of 9 Mostly Mixed: V, VII, IX, X - 4 Have Autonomic: III, V, IX, and X = mostly autonomic - Ipsilateral: no crossing over
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9. "On occasion, our trusty truck acts funny—very good vehicle anyhow"
Overview …
Memory Device
"On occasion, our trusty truck acts funny—very good vehicle anyhow"
"Oh once one takes the anatomy final, very good vacations are heavenly"
Figure 13.6b Location and function of cranial nerves (Marieb)
Cranial nerves
I – VI
Sensory
function
Motor
function
PS*
fibers
Cranial nerves
VII – XII
Sensory
function
Motor
function
PS*
fibers I II
III IV V VI
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Yes (smell)
Yes (vision) No
Yes (general
sensation) No
Yes No
Yes
VII
VIII IX X XI
XII
Facial
Vestibulocochlear
Glossopharyngeal
Vagus
Accessory
Hypoglossal
Yes (taste)
Yes (hearing
and balance) No
Yes
Some
Yes No
Cranial nerves
I – VI
Sensory
function
Motor
function
PS*
fibers
Cranial nerves
VII – XII
Sensory
function
Motor
function
PS*
fibers
*PS = parasympathetic
Sympathetic axons are all in Spinal Nerves
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10. 1. Cranial Nerves … a) The Olfactory Nerves = I
Sensory: from:
olfactory bulbs  Olfactory tract
 Cortex =
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11. b) Optic Nerves = II *Sensory from: *optic chiasma:
*Cerebral Cortex Region:
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12. c) The Oculomotor Nerves = III
*Location: midbrain
Motor-mostly
*4 eye muscles: _______________________
(except Sup Obl & Lat Rect)
From Cortex:
Parasympathetic Motor
Lens: Cilliary
Muscles
Sensory:
Proprioception
- To Cortex:
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13. d) IV = The Trochlear Nerves
Mixed, mostly motor
Location: Midbrain
*Motor:
Sensory: Proprioception
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14. e) V = The Trigeminal Nerves
Location: Lateral pons
Mixed Face
*Sensory:
Proprioceptors
To Cortex:
-- *Motor:
From Cortex:
3 Branches: mostly sensory—Ophthalmic, Maxillary, & Mandibular has somatic m
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15. f) VI = The Abducens Nerves
Location: posterior Pons
Mixed– mostly motor
*Motor 
Sensory: proprioception
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16. g) VII = The Facial Nerves
Location: Pons
Mixed
*Motor
*Somatic Motor for:
- To Cortex:
 Parasympathetic: salivary glands (submandibular & sublingual) and lacrimal glands
Sensory function
Proprioeptors
anterior 2/3 taste buds
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17. h) VIII = The Vestibulocochlear Nerves
Location: Pons-Medulla border
Sensory (mostly)
*Sensory: 1) 2)
- To Cortex:
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18. i) IX = The Glossopharyngeal Nerves
Location: medulla
Mixed
Motor
Muscles of
Sensory
Proprioception
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19. j) X = The Vagus Nerves Location: Lateral medulla
Nerve extends beyond head
Mixed
Motor– mostly Autonomic
*Parasympathetic Organs:
skeletal muscles of larynx and pharynx
Sensory– visceral:
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20. k) XI = The Accessory Nerves (Spinal Accessory)
*Location:
Mixed– mostly motor
Motor: Head & Neck muscles
trapezius & sternocleidomastoid muscles
Sensory
proprioception
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21. l) XII = The Hypoglossal Nerves
Location: Medulla: near midline, inferior to abducens
Mixed– mostly motor
Motor: Tongue muscles & muscles attached to Tongue for manipulation of food
Sensory: proprioception
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