Cranial Nerves

Question 1

Cranial Nerves

Answer 1

Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Auditory (Vesitbulocochlear), Glossopharyngeal, Vagus, Spinal Accessory, Hypoglossal

Question 2

Special Sensory Nerves

Answer 2

Olfactory [I], Optic [II], Vetibulocochlear [VIII]

SVA, SSA, SSA

Question 3

Myotomal Nerves

Answer 3

Oculomotor [III], Trochlear [IV], Abducens [VI], Hypoglossal [XII]

GSE/GVE, GSE, GSE, GSE

Question 4

Branchiomeric Nerves

Answer 4

Trigeminal [V] - Save Gas - Branchial Arch 1
Facial [VII] - Save Gas, Give Saliva - Branchial Arch 2
Glossopharyngeal [IX] - Save Gas, Give Saliva to Godiva - Branchial Arch 3
Vagus [X] - Save Gas, Give Saliva to Godiva - Branchial Arch 4
Spinal Accessory [XI] - Save Geese - Branchial Arch 5-6

Question 5

Olfactory

Answer 5

CN I
Special Sensory Nerve
SVA (Sensory)
Smell
Exit: Cribiform plate (Ethmoid)
Tract, NOT nerve
Olfactory bulbs

Question 6

Optic

Answer 6

CN II
Special Sensory Nerve
SSA (Sensory)
Vision
Exit: Optic canal (Sphenoid)
Tract, NOT nerve
Optic chiasm

Question 7

Oculomotor

Answer 7

CN III
Myotomal Nerve
GSE, GVE (Motor)
Eye movement (levator palpebrae superioris, superior rectus, inferior rectus, medial rectus, inferior oblique) –> GSE
Pupillary constriction (sphincter pupillae muscle and ciliary muscles) –> GVE preganglionic parasympathetic synapsing in ciliary ganglion
Exit: Wall of cavernous sinus to superior orbital fissure

Question 8

Trochlear

Answer 8

CN IV
Myotomal Nerve
GSE (Motor)
Eye movement - Superior oblique muscle
Exit: Wall of cavernous sinus to superior orbital fissure

Question 9

Trigeminal

Answer 9

CN V
Branchiomeric Nerve
1st Branchial Arch
SVE, GSA (Sensory and Motor)
Three major branches: 1) Opthalmic, 2) Maxillary, 3) Mandibular
Facial sensation and muscles of mastication

Question 10

Opthalmic

Answer 10

CN V(1)
GSA (Sensory)
Sensation from eyes and nose
Exit: Wall of cavernous sinus to superior orbital fissure

Question 11

Maxillary

Answer 11

CN V(2)
GSA (Sensory)
Sensation from middle of face (including nose, upper jaw)
Exit: Foramen rotundum
*Pterygopalatine ganglia

Question 12

Mandibular

Answer 12

CN V(3)
SVE (Motor) and GSA (Sensory)
Sensation from lower jaw
Muscles of mastication
Exit: Foramen ovale

Question 13

Abducens

Answer 13

CN VI
Myotomal Nerve
GSE (Motor)
Eye abduction - lateral rectus muscle
Exit: Cavernous sinus to superior orbital fissure

Question 14

Facial

Answer 14

CN VII
Branchiomeric Nerve
2 Branchial Arch

SVE GSA GVE SVA
Muscles of facial expression (SVE)
Ear sensation (GSA)
Parasympathetic secretion: lacrimal, submandibular, sublingual, nasal and oral glands (GVE)
Taste: anterior 2/3rds of tongue (SVA)

Sensory and motor roots exit through internal acoustic meatus and fuse to form nerve –> Geniculate ganglion
Greater petrosal nerve, Nerve to stapedius, Chorda tympani
Exit: Stylostoid foramen

Branches: Temporal, Zygomatic, Buccal, Mandibular, Cervical

Question 15

Vestibulocochlear

Answer 15

CN VIII
Special Sensory Nerve
SSA (Sensory)
Vestibular --> Balance
Cochlear --> Hearing
Exit: Internal acoustic meatus

Question 16

Glossopharyngeal

Answer 16

CN IX
Branchiomeric Nerve
3rd Branchial Arch

SVE GSA GVE SVA GVA (Sensory and Motor)
Stylopharyngeus muscle (SVE)
Sensation: posterior 1/3rd of tongue, oropharynx, middle ear; pharyngotympanic tube (GSA)
Parasympathetic secretion parotid gland (GVE)
Taste: Posterior 1/3rd of tongue (SVA)
Sensation: carotid body and sinus (GVA)

Exit: Jugular foramen

Question 17

Vagus

Answer 17

CN X
Branchiomeric Nerve
4th Branchial Arch

SVE GSA GVE SVA GVA
Muscles of pharynx, larynx and soft palate (SVE)
Sensation of larynx, and ear (GSA)
Parasympathetic innervation of gut (GVE)
Taste: epiglottis and pharynx (SVA)
Sensation of thoracic and abdominal viscera (GVA)

Exit: Jugular foramen

Question 18

Accessory

Answer 18

CN XI
Branchiomeric Nerve
5th and 6th Branchial Arches
SVE GSE (Motor)
2 Roots: Cranial and Spinal

Cranial Root –> larynx muscles except cricothyroid (SVE)
Spinal Root –> Trapezius and sternocleidomastoid (GSE)

Spinal root enters through Foramen Magnum
Exit: Jugular foramen - cranial root then follows Vagus

Question 19

Hypoglossal

Answer 19

CN XII
Myotomal Nerve
GSE (Motor)
Tongue Muscles
Exit: Hypoglossal canal