Nervous System
Dr. Brasington
Neuron
Neuroglia

Neuroglial cells fill spaces, support
neurons, provide structural frameworks,
produce myelin, and carry on
phagocytosis.
4
Types of neuroglial cells
Microglial cells are small cells that
phagocytize bacterial cells and cellular debris.
 Oligodendrocytes form myelin in the brain and
spinal cord.
 Schwann cells are the myelin-producing
neuroglia of the peripheral nervous system.
 Astrocytes are near blood vessels and support
structures, aid in metabolism, and respond to
brain injury by filling in spaces.
 Ependymal cells cover the inside of ventricles
and form choroid plexuses within the ventricles.
 Satellite Cells Surrounds neurons in PNS
ganglia  nourishes neurons and regulates
chemical environment

Fig09.03
Fluid-filled cavity
of the brain or
spinal cord
Neuron
Ependymal
cell
Oligodendrocyte
Astrocyte
Microglial cell
Axon
Capillary
Myelin
sheath (cut)
Node
6
Astrocytes
Microglial cell
Fig09.21
Meninges
10
Transverse
Fissure

Cranial Nerves

Olfactory, Optic, Oculomotor, Trochlear,
Trigeminal, Abducens, Facial,
Vestibulocochlear, Glossopharyngeal,
Vagus, Accessory, Hypoglossal

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funny—very good vehicle anyhow


Cranial Nerves
Olfactory, Optic, Oculomotor, Trochlear,
Trigeminal, Abducens, Facial, Vestibulocochlear,
Glossopharyngeal, Vagus, Accessory, Hypoglossal
Oh Oh Oh To Touch And Feel Virgin
Girl’s Vagina, AH
 Oh Oh Oh To Touch And Feel Virgin
Guy’s Valls, AH

Figure 13.6b Location and function of cranial nerves.
Cranial nerves
I – VI
I
II
III
IV
V
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
VI Abducens
Sensory
function
Motor
function
PS*
fibers
Yes (smell)
Yes (vision)
No
No
Yes (general
sensation)
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
Yes
No
Cranial nerves
VII – XII
VII Facial
VIII Vestibulocochlear
IX
X
XI
XII
Glossopharyngeal
Vagus
Accessory
Hypoglossal
Sensory
function
Motor
function
PS*
fibers
Yes (taste)
Yes (hearing
and balance)
Yes (taste)
Yes (taste)
No
No
Yes
Some
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
*PS = parasympathetic
Memory Tool
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Matter More
LR6 SO4 AO3- chemical equation for eye muscle innervation
Choroid
Ossicles
Otoliths
Plantar Reflex
L5, S1,2
Corticospinal
Toes point down
Weber Test
Reflex Arc
(Sensory
Neuron)
(Motor Neuron)
Plantar reflex (Babinski sign)
Snellen Eye Chart
Higher
Denominator,
Worse
vision
Ishihara Color Blindness
Plates
Astigmatism Test