CN Exits

Question 1

1- Olfactory

Answer 1

Brain: olfactory bulb
Dural: cribriform plate
Cranial: cribriform plate

Question 2

2- Optic

Answer 2

Brain: optic chiasma
Dural: post. pole of the eyeball
Cranial: optic canal
Cistern: chiasmatic cistern

Question 3

3- Oculomotor

Answer 3

Brain: oculomotor sulcus in interpenuncular fossa (b/t PCA & SCA)
Dural: cavernous sinus- b/y ant. & post. petroclinoidal folds
Cranial: sup. orbital fissuer
Cistern: interpeduncular cistern

Question 4

4- Trochlear

Answer 4

Brain: both sides of the frenulum of sup. medullary velum
Dural: cavernous sinus at the ant. petroclinoidal fold
Cranial: sup. orbital fissure
Cistern: (1) quadrigeminal cistern (2) ambiens cistern

Question 5

5- Trigeminal

Answer 5

Brain: b/t pons and brachium pontis, anteriorly.
Dural: Trigeminal (Meckels cave) 1+2: cavernous sinus 3:foramen ovale
Cranial: 1- sup. orbital fissure. 2- foramen rotondum 3-foramen ovale
Cistern:lateral pontine cistern

Question 6

6- Abducent

Answer 6

Brain: pontomedullary junction, sides of foramen cecum
Dural: cavernous sinus- ascends in clivus in Dorello’s canal
Cranial: sup. orbital fissure
Cistern: median pontine cistern

Question 7

7-Facial + 8- Vestibulocochlear

Answer 7

Brain: b/t pons and brachium pontis post (8 lateral to 7)
Dural: fundus of internal acoustic meatus
Cranial: fundus of internal acoustic meatus
Cistern: lateral pontine cistern

Question 8

9-Glossopharyngeal+ 10-Vagus+ 11-Accessory

Answer 8

Brain: lateral parovilary sulcus (9 sup. & 11 inf.).
Dural: Jugular foramen- pars nervosa
Cranial: Jugular foramen- pars nervosa
Cistern: —

Question 9

12- Hypoglossal

Answer 9

Brain: medial parolivary sulcus
Dural+Cranial: Hypoglossal canal
Cisten:—