Trigeminal Pathways

Question 0

What are the three regions where there is only pain sensation?

Answer 0

Teeth, cornea, and eardrum

Question 1

Is trigeminal sensory ipsilateral or contra lateral?

Answer 1

Ipsilateral

Question 2

What do the motor output of the trigeminal nerve do?

Answer 2

Muscles of mastication

Tensor tympani

Question 3

How many sensory ganglia are there in CN V?

Answer 3

3
Mesencephalic - properiception in jaw
Main (principal or chief) - normal touch
Spinal (descending) trigeminal - pain and temp (like spinal thalamic tract)

Question 4

Where does the mesencephalic tract axons have their cell bodies of their primary neurons?

Answer 4

In the CNS

Question 5

Where are most primary sensory cell bodies?

Answer 5

Outside the CNS

Question 6

Where is the chief sensory nucleus of CN V?

Answer 6

The pons

Question 7

What is unique about the sensory inform to the oral cavity?

Answer 7

It is bilateral

Question 8

What side is pain?

Answer 8

It is ipsilateral

Question 9

What do we call the face, oral, and pain/temp nerves going to the thalamus and what does it carry?

Answer 9

The ventral trigeminothalamic tract

Have sensory to the face, oral cavity, and pain to the face

Question 10

What is contained in the DTT dorsal trigeminothalamic tract?

Answer 10

Sensory to the oral cavity

Question 11

At what level is the trigeminal ganglion?

Answer 11

Midpons

Question 12

What end of the pons is closed?

Answer 12

A little more caudal

Question 13

What is the ventral basal nuclei made of?

Answer 13

VPM

VPL

Question 14

What is the orientation of the VPM?

Answer 14

Face most laterally
Intraoral cavity in the middle
Taste most medically 
Face and taste is contralateral
Oral is both ipsilateral and contralateral

Question 15

What nucleuses of the trigeminal are involved in the jaw jerk reflex?

Answer 15

The mesencephalic trigeminal nucleus and the Motor nucleus. It is a two neuron reflex

Question 16

What side is motor neurons of the motor nucleus of the trigeminal nerve?

Answer 16

Ipsilateral

Question 17

What is the one exception of primary sensory neurons being in the CNS?

Answer 17

The mesencephalic nucleus of CN V

Involved in the jaw jerk reflex

Question 18

What is the afferent supply of the trigeminal?

Answer 18

Ipsilateral to face, top of head, eardrum, 2/3 of tongue, proprioceptors for the jaw

Question 19

What is the major input to the main sensory nucleus from?

Answer 19

Mechanoreceptors

Question 20

Is the main sensory nucleus ipsilateral or contralateral?

Answer 20

Contra to the VPM joins the VTT

BUT a small part is bilateral to the mouth

Question 21

Where are the cell bodies of the mesencephalic nucleus?

Answer 21

The pons and medulla NOT the trigeminal ganglion

Pseudounipolar

Question 22

What area involves the jaw jerk reflex?

Answer 22

The mesencephalic nucleus