Objective 25 - CN function and Foramina

Question 1

CN 1
Cranial Exit?
Main Action?

Answer 1

Olfactory
Cribiform plate of ethmoid
Smell

Question 2

CN 2
Cranial Exit?
Main Action?

Answer 2

Optic
Optic canal
Vision from retina

Question 3

CN 3
Cranial Exit?
Main Action?

Answer 3

Oculomotor
Superior Orbital Fissure
Motor - superior, inferior and medial rectus, inferior oblique, levator palpebrae
Parasympathetic - sphincter pupillae and ciliary muscles

Question 4

CN 4
Cranial Exit?
Main Action?

Answer 4

Trochlear
Superior Orbital Fissure
Motor to superior oblique

Question 5

CN 5
Cranial Exit?
Main Action?

Answer 5

Trigeminal
V1 - Superior Orbital Fissure - sensation from cornea, skin of forehead
V2 - Rotundum - sensation over maxilla
V3 - Ovale - sensatoin over lower lip, teeth, anterior 2/3 tongue; motor to muscles of mastication

Question 6

CN 6
Cranial Exit?
Main Action?

Answer 6

Abducent
Superior Orbital Fissure
Motor to lateral rectus

Question 7

CN 7
Cranial Exit?
Main Action?

Answer 7

Facial
Internal acoustic meatus/stylomastoid foramen
Motor to muscles of facial expression; stapedius
Taste - anterior 2/3
Parasympathetic to submandibular and sublingual glands

Question 8

CN 8
Cranial Exit?
Main Action?

Answer 8

Vestibulocochlear
Internal acoustic meatus
Vestibular sensation from semicircular ducts, utricle and saccule (position/movement)
Hearing from spiral organ

Question 9

CN 9
Cranial Exit?
Main Action?

Answer 9

Glossopharyngeal
Jugular Foramen
Motor: stylopharyngeus
Parasympathetic to parotid
Visceral sensation - parotid, carotid, sinus etc
Taste - posterior 1/3

Question 10

CN 10
Cranial Exit?
Main Action?

Answer 10

Vagus

Jugular Foramen

Question 11

CN 11
Cranial Exit?
Main Action?

Answer 11

Spinal Accessory
Jugular Foramen
Motor - SCM, trapezius

Question 12

CN 12
Cranial Exit?
Main Action?

Answer 12

Hypoglossal
Hypoglossal canal
Motor- intrinsic and extrinsic muscles of tongue (except palatoglossus)