Trigeminal System

Question 1

Which of the 3 major divisions of CN V has both motor and sensory?

Answer 1

V3- Mandibular (muscles of mastication)

Question 2

What is the dorsal root ganglion equivalent in the trigeminal system?

Answer 2

trigeminal ganglion

Question 3

Chief sensory nucleus is the ________ equivalent of the trigeminal system. Whereas the spinal nucleus of the trigeminal system is the _______ equivalent

Answer 3

DCML, ALS

*Chief sensory nucleus sends signal to both ipsilateral (dorsal) and contralateral (ventral)

Question 4

Where does the trigeminal nucleus synapse in the thalamus?

Answer 4

VPM (ventral posteromedial)

Question 5

Second order trigeminal neurons originate in which two brain stem nuclei?

Answer 5

1-Principal (chief) trigeminal nucleus (pons, mostly tactile/DCML)
2-Spinal trigeminal nucleus (Medulla/spinal cord, pain/temp/ALS)

Question 6

Where do you find Third order trigeminal neurons?

Answer 6

projecting from VPM to the post central gyrus via the internal capsule

Question 7

What is the most common nerve to mess up in dental procedures?

Answer 7

Inferior alveolar nerve

Question 8

What are the 5 most common ways to cause inferior alveolar nerve damage?

Answer 8

1-implant placement
2-root canal treatment
3-fracture of mandible
4-Local anesthetic
5-Surgical extraction of lower molars (usually 3rd molars)

Question 9

What are the 3 nerve types in a tooth?

Answer 9

1–nociception ( develops 1st, in dentin)
2-proprioception (develops 2nd, in pulp)
3-sympathetic (last, after tooth eruption, controls inflammation)