Cranial Nerves

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Everything about the 12 Cranial Nerves!

brainstem

Where do most of the cranial nerves originate?

Olfactory

Cranial Nerve #1

Optic

Cranial Nerve #2

Oculomotor

Cranial Nerve #3

Trochlear

Cranial Nerve #4

Trigeminal

Cranial Nerve #5

Abducens

Cranial Nerve #6

Facial

Cranial Nerve #7

Acoustic

Cranial Nerve #8

Glossopharyngeal

Cranial Nerve #9

Vagus

Cranial Nerve #10

Spinal Accessory

Cranial Nerve #11

Hypoglossal

Cranial Nerve #12

first order neuron

What part of the sensory pathway is outside the CNS in a ganglion?

second order neuron

What part of the sensory pathway is in the brainstem?

third order neuron

What part of the sensory pathway is in the thalamus?

sensory

Which pathway begins in a ganglion, synapses and crosses in the brainstem, synapses in the thalamus, and then travels to the cortex?

motor

Which pathway begins in the precentral gyrus, travels through the internal capsule, synapses in the brainstem, and then travels to different muscles?

flaccid

What is a LMN symptom of weakened muscle tone?

spastic

What is the symptom described as increased muscle tone?

protection

Why are most cranial nerves bilateral?

contralateral

Are bilateral or contralateral projections stronger?

olfactory

Which cranial nerve bypasses the thalamus and brainstem?

optic

Which cranial nerves bypasses the brainstem (not the thalamus)?

mucosa
uncus

The olfactory nerve starts in the _______ of the navel cavity, synapses at the olfactory bulb, travels through the olfactory tract, and then to the _______ of the cortex.

retina
chiasm
thalamus
visual cortex

The optic nerve originates from the _____, travels down the optic nerve, crosses at the optic _____, travels down the optic tract through the _____, and ends in the_____ in the occipital lobe.

olfactory

Which nerve provides the sensory for smell?

optic

Which nerve provides the sensory for vision?

left

Through the optic nerve which hemisphere of the brain receives the left half of vision from both eyes?

oculomotor, trochlear, abducens

Which nerves provide the motor for the eyes?

oculomotor

The inferior rectus, medial rectus, superior rectus, and inferior oblique are controlled by this nerve.

oculomotor

Ptosis of eyelid, dilation of pupil, and eye abducted are damage symptoms of which nerve?

oculomotor, trochlear

Which nerves have nuclei in the midbrain?

trochlear

Which nerves is the only one to start dorsally and then project ventrally?

trochlear

The superior oblique is controlled by this nerve.

trochlear

Which nerve controls eye gaze lateral and downward?

abducens

Which nerve controls eye gaze only lateral?

abducens, trigeminal, facial, acoustic

Which nerves have nuclei in the pons?

abducens

The lateral rectus is controlled by this nerve.

trigeminal

Which nerve has the largest diameter?

sensory

The larger root of the trigeminal nerve is _____?

opthalmic, maxillary, and mandibular

What are the three branches of the trigeminal nerve?

opthalmic

This branch of the trigeminal nerve provides sensory to the upper face inculding the conjunctiva, corena, forehead, eyelid, and bridge of nose?

maxillary

This branch of the trigeminal nerves provides sensory to the middle face including the cheeks, nasal cavity, and upper jaw.

mandibular

This branch of the trigeminal nerve provides sensory and motor to the lower face including the jaw, teeth, gums, anterior 2/3 of tongue, external auditory meatus, and external tympanic membrane.

three

How many trigeminal nuclei are there?

main trigeminal nucleus

Which trigeminal nucleus is responsible for fine touch and vibration?

spinal trigeminal nucleus

Which trigeminal nucleus is responsible for pain and temperature?

mesencephalic trigeminal nucleus

Which trigeminal nuclei is responsible for proprioception?

motor

Is the facial nerve primarily sensory or motor?

facial

Which cranial nerve wraps around the abducens before exiting the brainstem?

Bell's palsy

This is a LMN lesion in the facial nerve that results in paralysis in the ipsilateral face.

facial

Which cranial nerve mediate the taste from the anterior 2/3 of the tongue?

glossopharyngeal

Which cranial nerve mediates the taste from the posterior 1/3 of the tongue?

trigeminal

Which cranial nerve mediates the sensory of the anterior 2/3 of tongue?

lower
opposite

Damage in the UMN of the facial nerve results in damage of the _____ face on the _____ side of the face?

hearing

The acoustic part of the acoustic nerve is responsible primarily for _____.

balence

The vestibular division of the acoustic nerve is responsible primarily for _____.

both

Is the glossopharyngeal nerve sensory or motor?

glossopharyngeal, vagus

Which cranial nerves are important for phonation and swallowing?

90
10

The vagus nerve is _____% sensory and _____% motor.

spinal accessory

The nerve helps the vagus nerve by helping to innervate the muscles of the larynx.

hypoglossal

This cranial nerve innovates the tounge muscles.

glossopharyngeal, vagus, hypoglossal

Which nerves have nuclei in the medulla?

spinal accessory

Which nerve has its nuclei in the spinal cord?

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