Cranial Nerves for PA School

name CN VI

Abducens

CN III function

Eye movement, pupil constriction

name CN IX

Glossopharyngeal

trochlear nerve number and innervation

IV motor: superior oblique muscle of eye

glossopharyngeal number and innervation

IX sensory: taste on posterior 1/3 of tongue, sensation in pharynx, tonsillar sinus, pharyngotympanic tube, middle ear cavity motor: stylopharyngeus muscle, parotid gland

vesicles on the tip of the nose should be associated with

Opthalmic herpes zoster infection involving the Trigeminal CN V

name CN II

Optic

S, M, or B: CN I

Sensory

name CN X

Vagus

accessory nerve number and innervation

XI motor: sternocleidomastoid and trapezius muscles

decussate

crossing to other side of brain or spinal cord

Trigeminal CN V

nerve A

name CN XI

Accessory

name CN VII

Facial

name CN XII

Hypoglossal

olfactory nerve number and innervation

I sensory: olfactory epithelium

optic nerve number and innervation

II sensory: retina ganglion cells

oculomotor nerve number and innervation

III motor: ciliary muscles, sphincter pupillae, all extrinsic muscles of eye except those listed for CN IV and VI

S, M, or B: CN IV

Motor

name CN III

Oculomotor

name CN I

Olfactory

On Occasion Our Trusty Truck Acts Funny Very Good Vehicle Any How

Olfactory Optic Oculomotor Trochlear Trigeminal Abducens Facial Vestibulocochlear Glossopharyngeal Vagus Accessory Hypoglossal

On Occasion Our Trusty Truck Acts Funny, Very Good Vehicle Any How

Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulocochlear, Glossopharyngeal, Vagus, Accessory, Hypoglossal

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On Occasion Our Trusty Truck Acts Funny, Very Good Vehicle Any How

the three branches of the Trigeminal CN V

Ophthalmic CN V-1 Maxillary CN V-2 Mandibular CN V-3

When a latent herpes zoster infection involves Trigeminal CN V, which of its branches is most commonly involved in a viral reactivation eruption?

Opthalmic V-1

sensory motor mnemonic

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Maxillary V-2, infraorbital foramen

This nerve block (internal and external approaches) is targeting which nerve exiting which foramen?

name CN V

Trigeminal

name CN IV

Trochlear

trigeminal number and innervation

V sensory: face, sinuses, teeth

abducens number and innervation

VI motor: lateral rectus muscle of eye

facial nerve number and innervation

VII sensory: taste on anterior 2/3 of tongue, soft palate motor: submandibular, sublingual, and lacrimal glands

vestibulocochlear number and innervation

VIII sensory: orientation, motion cochlear nerve branch: hearing

the two branches of the Vestibulocochlear CN VIII

Vestibular Cochlear

name CN VIII

Vestibulocochlear

skin of the upper lip and cheek

What area of the face will be anesthetized by this nerve block?

vagus nerve number and innervation

X sensory: pharynx, larynx, reflex sensory from tracheobronchial tree, lungs, heart, GI tract to left colic flexure motor: palate, pharynx, larynx, trachea, bronchial tree, heart, GI tract to left colic flexure

hypoglossal number and innervation

XII motor: all intrinsic and extrinsic muscles of tongue except palatoglossus

testing corneal reflex involves which nerves and fiber types

afferent fibers of Opthalmic V-1 and efferent fibers of Facial CN VII

without the optic chiasm, we would not have ___ ___ or sense ___ _ __

binocular vision, depth of field

corneal reflex

both eyes blink when cotton lightly touched to one eye from the side

Mandibular CN V-3

cranial nerve branch that exits the cranium through the foramen ovale

Maxillary CN V-2 of Trigeminal nerve

cranial nerve branch that exits the cranium through the foramen rotundum

Vestibular and Cochlear branches of the Vestibulocochlear CN VIII

cranial nerve branches that exit the cranium through the internal acoustic meatus

Hypoglossal CN XII

cranial nerve that exits the cranium through the hypoglossal canal

Facial CN VII

cranial nerve that exits the cranium through the internal acoustic meatus, the facial canal, and the stylomastoid foramen

C2 spinal nerve

dermatome A is innervated by

Opthalmic V-1 branch of Trigeminal CN V

dermatome B is innervated by

Maxillary V-2 branch of Trigeminal CN V

dermatome C is innervated by

Mandibular V-3 branch of Trigeminal CN V

dermatome D is innervated by

spinal nerve C3

dermatome E is innervated by

spinal nerve C4

dermatome F is innervated by

spinal nerve C5

dermatome H is innervated by

Olfactory CN I

exits the cranium through the foramina in cribiform plate of ethmoid bone

Optic CN II

exits the cranium through the optic canal

CN IV function

eye movement

right, left

fibers from the right halves of both retinas form the __ optic nerve tract, and fibers from the left halves of both retinas form the __ optic nerve tract

anosmia may be a clue to

fractured cranial base and cerebrospinal fluid rhinorrhea, or COVID, Parkinson's

CN VIII function

hearing and balance

if all Olfactory nerve bundles are torn on one side, then complete loss of smell occurs on the __ side

ipsilateral (same)

CN VI function

lateral eye movement

anosmia definition and causes

loss of smell aging, smoking, cocaine use, viral or allergic rhinitis, torn olfactory bulbs, fractured cribriform plate, psychiatric disorders (schizophrenia & epilepsy)

CN XI function

muscles of head movement

Opthalmic V-1 branch

nerve B

Mandibular V-3 branch

nerve C

Maxillary V-2 branch

nerve D

Optic CN II is a paired nerve whose right and left fibers enter the middle cranial fossa to form the __ __ where some of the fibers from each nerve __.

optic chiasm, cross

cranial nerves are like spinal nerves in that they contain __ or __ fibers, or a ___ of these

sensory, motor, combination

CN X function

sensory: sensation from viscera of neck, thorax, and abdomen, and taste from epiglottis and palate motor: muscles of larynx, pharynx, and palate parasympathetic: to viscera of neck, thorax, and abdomen

CN V function

sensory: somatosensory information from face and head motor: muscles for mastication

CN VII function

sensory: taste on anterior 2/3 of tongue, somatosensory information from ear motor: facial expression

CN IX function

sensory: taste on posterior 1/3 of tongue, somatosensory information from tongue, tonsil, pharynx motor: some swallowing muscles

CN I function

smell

Oculomotor CN III, Trochlear CN IV, Abducens CN VI, Opthalmic CN V-1 of Trigeminal nerve

three cranial nerves and one CN branch that exit the cranium through the superior orbital fissure

Glossopharyngeal CN IX, Vagus CN X, and Accessory CN XI

three cranial nerves that exit the cranium through the jugular foramen

CN XII function

tongue movement

CN II function

vision