Cranial Nerves Quiz Brig

Which two cranial nerves are not true cranial nerves?

I and II

originate from forebrain instead of brain stem

what is the only cranial nerve to leave the brainstem on the dorsal surface

CN IV

CN I name

olfactory nerve

CN I composition

sensory

CN I origin

forebrain

CN I foramina

cribriform plate of ethmoid bone

CN I function

smell from nasal mucosa

CN II name

optic nerve

CN II composition

sensory

CN II origin

forebrain

CN II foramina

optic canal of sphenoid bone

CN II function

vision

CN III name

oculomotor nerve

CN III composition

motor (w/ parasympathetic output)

CN III origin

midbrain

CN III foramina

superior orbital fissure

CN III function

Motor innervation to all extrinsic eye muscles (except superior oblique and lateral rectus) and all intrinsic eye muscles

CN IV name

trochlear nerve

CN IV composition

motor

CN IV origin

midbrain

CN IV foramina

superior orbital fissure

CN IV function

motor innervation to superior oblique muscle of the eye

-rolls eyeball inferolaterally

CN V name

trigeminal nerve

CN V composition

mixed

CN V origin

Pons

CN V foramina (3 divisions)

Ophthalmic division, V1 - superior orbital fissure

Maxillary division, V2 - foramen rotundum of sphenoid bone

Mandibular division, V3 - foramen ovale of sphenoid bone

CN V functions

1. carry sensory information from face and jaws

2. motor innervation to muscles of mastication

CN VI name

abducens nerve

CN VI composition

motor

CN VI origin

pons

CN VI foramina

superior orbital fissure

CN VI function

motor innervation to lateral rectus muscle of eye

-moves eyeball laterally

CN VII name

facial nerve

CN VII composition

both (mixed)

CN VII origin

Pons

CN VII foramina

internal acoustic meatus and stylomastoid foramen of temporal bone

CN VII function

-muscles of facial expression

-taste sensory for anterior 2/3 of tongue

-parasympathetic for lacrimal, nasal, submandibular, and sublingual glands

CN VIII name

vestibulocochlear nerve

CN VIII composition

sensory

CN VIII origin

pons

CN VIII foramina

internal acoustic meatus of temporal bone

CN VIII function

Carry 2 forms of special sense information:

1. vestibular part carries equilibrium and balance information

2. cochlear part carries hearing information

CN IX name

glossopharyngeal nerve

CN IX composition

both (mixed)

CN IX origin

medulla

CN IX foramina

jugular foramen

CN IX functions

-motor to stylopharyngeus muscle

-parasympathetic to parotid gland

-sensation from pharynx

-special sensory taste from posterior 1/3 of tongue

CN X name

vagus nerve

CN X composition

both (mixed)

CN X origin

medulla

CN X foramina

jugular foramen

CN X functions

-motor innervation to pharynx muscles

-sensory information from larynx

-motor to muscles of larynx

-autonomic signals to smooth muscle of esophagus

-autonomic signals to myocardium

CN XI name

accessory nerve

CN XI composition

motor

CN XI origin

medulla

CN XI foramen

jugular foramen

CN XI function

provide motor innervation to SCM and trapezius muscles

CN XII name

hypoglossal nerve

CN XII composition

motor

CN XII origin

medulla

CN XII foramina

hypoglossal canal and occiput

CN XII function

motor innervation to intrinsic and extrinsic muscle of the tongue (except palatoglossal muscle)

Forebrain nerves

I and II

Midbrain nerves

III-IV

Pons nerves

V, VI, VII, and VIII

Medulla oblongata nerves

IX, X, XI, XII

CN mnemonic

Oh - olfactor

Oh - ocular

Oh - oculomotor

To - trochlear

Touch - trigeminal

And - abducens

Feel - facial

A - vestibulocochlear

Girls - glossopharyngeal

Vagina - vagus

Ah - accessory

Heaven - hypoglossal

CN composition mnemonic

Some

Say

Marry

Money

But

My

Brother

Says

Big

Brains

Mean

More

Eyeball nerves

III, IV, VI

Sensory tongue nerves

V, VII, and IX

general tongue sense nerve

V

special tongue sense nerves

VII and IX

what nerve supplies all extrinsic and intrinsic muscles of tongue

XII