Cranial nerves III Flashcards Preview

Year 1 Neuroanatomy > Cranial nerves III > Flashcards

Flashcards in Cranial nerves III Deck (11)
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1
Q

what are the sensory nuclei of the trigeminal nerve? where are they located specifically?

A
  1. mesencephalic - midbrain 2. principal (main) - midpons 3. spinal - pons, medulla, C1-2/3
2
Q

what are the functions of the trigeminal sensory nuclei?

A
  1. mesencephalic - general proprioception 2. main - discriminatory touch 3. spinal - nociceptive, tactile, and thermal sensation
3
Q

where is the motor nucleus of the trigeminal located?

A

midpons

4
Q

what are the components of the discriminatory touch pathway from the orofacial region?

A

trigeminal ganglion (1st order) - main sensory nucleus (2nd order) - dorsal trigeminal lemniscus - VPM of thalamus (3rd order) - postcentral gyrus

5
Q

what are the components of the pain and temperature pathway from the orofacial region?

A

trigeminal ganglion (1st order) - spinal tract - spinal nucleus (2nd order) - ventral trigeminal lemniscus - VPM of thalamus (3rd order) - postcentral gyrus / anterior cingulate / anterior insular cortices

6
Q

what are the components of the general proprioception pathway from the orofacial region?

A

mesencephalic nucleus (1st order) - branches of trigeminal nerve - main sensory nucleus (sensation) / motor nucleus (reflex)

7
Q

what is the role of the trigeminal in the corneal blink reflex?

A
  1. afferent limb - opthalmic division 2. efferent limb - facial nerve
8
Q

what is the result of damage to the mandibular division of the trigeminal?

A

reduced sensation over V3 area, jaw deviation to side of lesion

9
Q

what is the result from a lesion to the spinal tract and/or spinal V nucleus between the midpons and C2/3?

A
  1. loss of pain and temperature sensation 2. dimunition of tactile sense IPSILATERAL orofacial region and GSA territory of CN 7, 9, 10
10
Q

what is the result of a lesion to the ventral V lemniscus?

A
  1. loss of pain and temperature sensation 2. dimuniation of tactile sense CONTRALATERAL orofacial region and GSA territory of CN 7, 9, 10
11
Q

what is the result of a lesion to the dorsal V lemniscus between the midpons and thalamus?

A

partial dimunition of tactile sense from ipsilateral orofacial region