Trigeminal Nerve

Question 1

Where does the spinal nucleus of CN V located?

Answer 1

• Lower Pons
• Medulla
• Upper spinal cord

Question 2

Where are the primary sensory and motor nuclei of CN V located?

Answer 2

• Middle pons

Question 3

Where is the mesencephalic nucleus located?

Answer 3

• Upper pons and midbrain

Question 4

What are the 3 portions of the trigeminal nerve?

Answer 4

V1: Opthalamic
V2: Maxillary
V3: Mandibular

Question 5

What functional components does CN V have?

Answer 5

SVE

GVA

Question 6

What is the GVA component of the trigeminal nerve?

Answer 6

• Sensory to face
• Oral cavity
• Dura mater of anterior and middle cranial fossa

Question 7

What is the SVE of CN V?

Answer 7

• Muscles of mastication

Question 8

What sensory information is processed in the mesencephalic nucleus of CN V?

Answer 8

• Proprioception

Question 9

What information is processed by the chief nucleus of CN V?

Answer 9

• Somatosensory information to the face and head

Question 10

What information is processed at the spinal nucleus of CN V?

Answer 10

• Pain and temperature of the face and head

Question 11

What division of CN V is the only one containing motor fibers?

Answer 11

V3: Mandibular

Question 12

What reflex travels through the motor nucleus of CN V?

Answer 12

• Jaw jerk

Question 13

What types of fibers synapse on the mesencephalic nucleus?

Answer 13

Ia
Ib
II

Question 14

What reflex travels through the mesencephalic nucleus?

Answer 14

Stretch reflex

Question 15

What are the 3 parts of the spinal nucleus?

Answer 15

• Caudalis
• Interpolaris
• Oralis

Question 16

Which part of the spinal nucleus is concerned with pain and temperature to the face?

Answer 16

• Caudalis

Question 17

How is the caudalis portion of the spinal nucleus arranged somatotopically?

Answer 17

• V1 ventrolateral

- V3 dorsomedial

Question 18

What does the interpolaris provide sensation to?

Answer 18

The teeth

Question 19

What does the oralis provide sensation to?

Answer 19

Touch from mouth, lip, nose

Question 20

What pain and temperature sensation does CN VII supply through CN V?

Answer 20

• External ear
• External auditory meatus
• Outer surface of ear drum

Question 21

What pain and temperature sensation does CN IX supply through CN V?

Answer 21

• Ear
• Posterior 1/3 of tongue
• Auditory tube
• Upper pharynx

Question 22

What pain and temperature sensation does CN X supply through CN V?

Answer 22

• Ear
• Lower pharynx
• Upper esophagus

Question 23

What is trigeminal neuroalgia?

Answer 23

• Episodic paroxysmal pain of CN V distribution

- Mild stimuli cause pain ipsi-laterally to lesion

Question 24

Describe the path of the ventral trigeminal thalamic tract.

Answer 24

• GVA from the face descend down to the spinal nucleus

- Projectional tract cells cross over and ascend up to thalamus

Question 25

How do fibers from the muscles of mastication regular jaw jerk reflex?

Answer 25

- Collateral from proprioceptive fibers synapse on the motor nucleus