Cranial Nerves

Question 1

Sequence of choise

Answer 1

Isotropic T2CISS 0.6mm with gad

Question 2

What is peculiar about the oculomotor (3) nerve?

What does an enlarged pupil mean?

Answer 2

It has a parasympathetic component that contricts the pupil

There is compression of the parasympathetic fibers of C3

Question 3

What is the function of the trochlear nerve?

Answer 3

Motor function - superior oblique m.

Question 4

What is the transitional zone of a nerve

What is the length of the TZ ?

Answer 4

The proximal part of the nerve where myelin is formed by oligodendrocytes while the rest from Schwann cells

Usually 1mm for III-XII except CN8 = 10mm

Question 5

Branches and function of the trigeminal nerve?

Answer 5

Opthalmic, Maxillary, Mandibular

Face sensation and Motor - mastication

Question 6

Where is the nucleus of the abducens (CN6)

Answer 6

Facial colliculus

Question 7

Facial (CN7) nerve functions

Answer 7

Motor function - facial expressions

Taste sensation

Parasympathetic component - tears and salivary glands

Question 8

Course of IX, X and XI nerve

Answer 8

Post-olivary sulcus to jugular foramen

Question 9

Functions of Glossopharyngeal IX

Answer 9

Oral Sensation and Taste - salivation

Question 10

Functions of Vagus nerve

Answer 10

Parasympathetic control of heart, lungs and digestive tract

Recurrent laryngeal nerve - speech

Question 11

Functions of Accessory nerve XI

Answer 11

Shoulder elevation (trapezius muscle)

Head - turning (SCM)

Question 12

Course of Hypoglossal XII

Function of Hypoglossal

Answer 12

Pre-olivary nucleus - hypoglossal canal

Tongue Movement - Motor

Question 13

What part of the Olfactory nerve is visible?

Answer 13

Olfactory bulb and filaments

Question 14

Foramen Rotondum

Pterygoid/vidian canal

Foramen ovale

Foramen lacerum

Answer 14

Rotondum - Maxillary n. V2

Pterygoid/vidian canal: Vidian n.

Foramen Ovale: Mandibular n. V3 (no course cavernous sinus)

Foramen lacerum: Ascending pharyngeal artery, Greater petrosal n. Deep Petrosal n. (give Vidian n.)

Question 15

Pterygopalatine fossa location and communications

Answer 15

Between posterior wall of maxillary sinus and anterior surface of pterygoid process sphenoid bone

Orbit: IOF

Nasal Cavity: Pharyngeal canal and sphenopalatine foramen

Oral cavity: Greater Palatine canal

Middle cranial Fossa: Foramen rotondum, vidian canal

Infratemporal fossa: Pterygomaxillary fissure