Cranial Nerves And Foramina

Question 1

What are the 12 cranial nerves?

Answer 1

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

Question 2

What nerves are sensory and which are motor?

Answer 2

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Olfactory - sensory
Optic - sensory
Oculomotor - motor
Trochlear - motor
Trigeminal - both
Abducens - motor
Facial - both
Vestibulocochlear - sensory
Glossopharyngeal - both
Vagus - both
Accessory - motor
Hypoglossal - motor

Question 3

Where do all the cranial nerves originate from?

Answer 3

Nuclei on the brainstem

Olfactory - cerebrum

Optic - diencephalon

Accessory nerve originates in spinal cord

Question 4

Label all the foramina and what exits there

Answer 4

Question 5

Origin, course and function and name of CNI

Answer 5

Olfactory

Origin in cerebrum, runs through the cribiform foramina and innervates nasal cavity with sensory info

Question 6

Name, Origin, course and function of CN2

Answer 6

Optic

Origin in diencephalon, leaves skull via optic Canal and provides sensory innervation to the eye

Question 7

Name, Origin, course and function of CNIII

Answer 7

Occulomotor

Origin in brainstem, leaves skull via superior orbital fissure and provides motor innervation to eye muscles minus the other 2 CN muscles

Question 8

Name, Origin, course and function of CNIV

Answer 8

Trochlear

Origin in brainstem, leaves skull from the superior orbital fissue and provides motor innervation to the eye

(superior oblique muscle)

Question 9

Name, Origin, course and function of CNV

Answer 9

Trigeminal

Origin in brainstem,

V1 leaves via superior orbital fissue

V2 leaves via foramen rotundum

V3 leaves via foramen ovale

V1 = sensory to forehead and scalp
V2 - sensory to maxilla and sinuses, oral cavity
V3 - sensory to mandible and motor to muscles of mastication

Question 10

Name, Origin, course and function of VI

Answer 10

Abducens

Origin in brainstem, leaves via superior orbital fissue, motor innervation to lateral rectus muscle

Question 11

Name, Origin, course and function of CNVII

Answer 11

Facial nerve

Origin in brainstem, leaves via internal acoustic meatus,

Motor function to muscles of face inc suprahyoid muscles, and submandibular glands

Sensory to the tongue and soft palate

Question 12

Name, Origin, course and function of CNVIII

Answer 12

Vestibulocochlear

Origin in brainstem, leaves via internal acoustic meatus, sensory function to the ear

Question 13

Name, Origin, course and function of CN IX

Answer 13

Glossopharyngeal

Origin in brainstem, leaves via jugular foramen,

Motor to parotid gland

Sensory to posterior 1/3 tongue tasted and tonsils, pharynx and middle ear

Question 14

Origin, course and function of X

Answer 14

Vagus

Origin in brainstem, leaves via jugular foramen

Motor to the heart, lungs, trachea, palate, bronchi, GIT

Sensory to heart, lungs, trachea, bronchi, GIT, external ear

Question 15

Name, Origin, course and function of CNXI

Answer 15

Accessory nerve

Origin in spinal cord, enters/leaves via jugular foramen

Motor to the sternocleidomastoid and trapezius

Question 16

Name, Origin, course and function of CNXII

Answer 16

Hypoglossal

Origin in brainstem, leaves via hypoglossal canal,

Motor to the tongue muscles and infrahyoid muscles