Download Optic Nerves * Jack Baesman

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Olfactory
Optic
Oculomotor
Trochlear
Trigeminal (3 divisions…)
Abducens
Facial
Vestibulocochlear (2 divisions)
Glossopharyngeal
Olfactory Nerves
Eric Johnson
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Sensory Nerves associated with
sense of smell
Contains only axons of sensory,
bipolar neurons.
Located in upper nasal cavity
Olfactory receptor cells carry
impulses to neurons in olfactory
bulbs
Sensory impulses travel from
bulbs along olfactory tracts to
the
cerebral centers where they are
interpreted into the sensation of
smell.
Optic Nerves – Jack Baesman
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A pair of nerves that leads from the eyes to the brain
Enable sight
Sensory nerves
The cell bodies form ganglion in the eyes, and the axons
pass through the optic foramina
The impulses are interpreted in the visual cortices of
the occipital lobes
Bipolar
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Primarily Motor
Arise from the midbrain
Pass into the orbits of the eyes
The motor fibers transmit impulses
to the muscles to:
 Raise eyelids
 Move eyes
 Adjust the amount of light
entering the eyes
 Focus lenses
Primarily Motor
 The motor fibers
transmit impulses to
move the eyes.
 Some sensory fibers
transmit impulses
associated with the
condition of the
muscles.
 Smallest cranial
nerves
 Arise from the
midbrain
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Trochlear Nerve
Trigeminal Nerves
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Largest cranial nerves
Arise from pons
Mixed nerves
Sensory portions more
extensive than motor portions
3 large branches
 Ophthalmic
 Maxillary
 Mandibular
Abducens
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6th cranial nerve
Small nerves that
originate from the pons
near the medulla
oblongata
Are primarily motor
Enter the orbit of the eye
and control motor
impulses in the muscles
that move the eye
#7: Facial Nerve
By Lauren Sayers
• Location: Arises from the
lower part of the pons +
emerges on the sides of the
face.
• Function:
Sensory fibers transmit impulses
associated with taste receptors
of the anterior tongue.
Motor fibers transmit impulses
to muscles of facial
expression/tear/salivary glands.
Vestibulocochlear nerves (VIII)
• Sensory nerves from medulla
oblongata
• Two parts- vestibular branch and
cochlear branch
• Vestibular Branch- cell body
associated with inner ear and reflexes
that help maintain equilibrium.
• Cochlear Branch- Cell body houses
hearing receptors, these signals pass
through medulla oblongata and pons
to be sent to the temporal lobe, where
they are interpreted and sent back out.
Glossopharyngeal nerves
9th pair
 Arise from medulla
oblongata
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Predominately sensory
fibers, carry impulses to
linings of pharynx,
tonsils, back of tongue
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Innervate muscles of
the pharynx that
function in swallowing
Vagus Nerves
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10th pair
Originate in the medulla
oblongata , extend down
the neck into chest
abdomen
Somatic and autonomic
branches
Somatic fibers carry
impulses to larynx, help
with speech and
swallowing
Autonomic fibers supply
heart and smooth
muscles and glands in
thorax and abdomen
Accessory Nerves
11th pair
 Originate in medulla
oblongata and spinal
cord (have cranial and
spinal branches)
 Cranial branch- joins
vagus nerve, innervates
muscles of soft palate,
pharynx, and larynx
 Spinal branch- drops into
neck, innervaes trapezius
and sternocleidomastoid
muscles
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12th pair
 Arise from medulla oblongata, into
tongue
 Motor fibers innervate muscles that
move the tongue for speaking, chewing,
and swallowing.
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Hypoglossal
nerve