Pathway for pain, temperature and crude touch of the face

Question 1

Where are the primary neuron cell bodies for pain,temperature and crude touch of the face found?

Answer 1

Located in Gasserian (trigeminal) Ganglion

Question 2

What kind of neurons are the primary neurons pain,temperature and crude touch of the face?

Answer 2

Pseudounipolar neurons

Question 3

What are the nerve fiber types for pain and temperature of the face?

Answer 3

A delta and C fibers

Question 4

What are the nerve fiber types for crude touch of the face?

Answer 4

A beta, A delta, and C fibers

Question 5

How are the peripheral processes of the primary neurons pain,temperature and crude touch of the face distributed?

Answer 5

Via divisions of the trigeminal nerve:
V1 - opthalmic
V2 - Maxillary
V3 - Mandibular

Question 6

Where do the central processes pain,temperature and crude touch of the face enter the brainstem?

Answer 6

The pons with the V nerve

Question 7

How do the processes descend in the brainstem?

Answer 7

Descending the brainstem as the spinal trigeminal tract or the spinal tract of the V nerve

Question 8

Where do fibers from the central process for crude touch terminate for the face??

Answer 8

Pars Rostralis of the spinal trigeminal nucleus

Question 9

Where do the fibers of the central process for pain and temperature terminate for the face?

Answer 9

Pars caudalis of the spinal trigeminal nucleus

Question 10

Where are the secondary neuron cell bodies for pain, temperature and crude touch of the face found?

Answer 10

Cell bodies of the spinal trigeminal nucleus (pars rostralis and caudalis)

Question 11

Where do secondary neurons project axons to for pain, temperature and crude touch of the face?

Answer 11

To the contralateral side of the brainstem

Question 12

Where do the projected axons from the secondary neurons ascend for pain, temperature and crude touch of the face?

Answer 12

Via the (ventral) trigeminothalmic tract (TT tract)

Question 13

Where do secondary neuron fibers terminate for pain, temperature and crude touch of the face?

Answer 13

Fibers of the trigeminothalmic tract ascend the brainstem and terminate in the Ventral Posterior Medial nucleus of the thalamus

Question 14

Where do the tertiary neurons for pain, temperature and crude touch of the face project?

Answer 14

Teritiary neurons in the VPM nucleus project axons from the VPM through the posterior limb of the internal capsule and they terminate in the “face” area of the post central gyrus

Question 15

What is the functional signicance of projections to the primary somesthetic cortex for pain sensation in the face?

Answer 15

Processes data to experience perception of fast, sharp, well localized pain of the face therefore discriminative pain

Question 16

Does painful stimuli to the face activate other pathways of neurons?

Answer 16

Yes it also provides for the slow stage of the pain experience or nondiscriminative pain

Question 17

Where do the alternative pathways for pain, temperature and crude touch of the face project to?

Answer 17

Project to the brainstem reticular formation and to the posterio, intralaminar and mediodorsal nuclei of the thalamus, and their projections to wide areas of the cerebral cortex