Trigeminal Pathways - 4/22 Stephens Flashcards Preview

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Flashcards in Trigeminal Pathways - 4/22 Stephens Deck (18)
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1
Q

Both the sensory and motor roots of V pierce what structure just posterolateral to the pons?

A

Middle cerebellar peduncle

2
Q

Precise tactile information to the face travels via what nucleus?

Short/long fibers?
Ascend/descending root?

A

Main sensory nucleus of V

Short ascending

3
Q

1 half of primary fibers descend only in the descending root of V, where do they terminate?

What information do they convey?

A

Subnucleus caudalis of the descending nucleus of V

A delta pain and temp info from the face

4
Q

Where do secondary axons decussate and ascend in the pain/temp pathway from the face?

Where do the secondary axons terminate?

A

Trigeminal nucleus (TL)

ventral posterior medial (VPM) nucleus of dorsal thalamus

5
Q

Tertiary axons from the VPM nucleus terminate where?

A

Post central gyrus (head region of primary somesthetic cortex)

6
Q

C type pain fibers covey slow pain to where?

Neurons from this location project to where?

A

Subnucleus caudalis

RF

7
Q

Primary axons conveying crude tactile pathways from the face convey information to what nuclei?

A

Main sensory nucleus (ascending)

Subnuclei rostralis and interpolates of the descending nucleus (descending)

8
Q

Secondary axons from the crude tactile pathway will travel in what ways before reaching the VPM of the thalamus?

A

TL

dorsal central Trigeminal tract (DCTT) REMAIN UNCROSSED

9
Q

Precise tactile information from the face has a primary neuron that travels where?

A

Ascends ONLY in the short ascending root of V and terminates in the main sensory nucleus of V

10
Q

Secondary neurons of the precise tactile pathway from the face travel how?

To where?

A

Ipsilateral dorsal central Trigeminal tract (DCTT)
TL

VPM

11
Q

Tertiary neurons from the precise tactile pathway will end up where?

A

Postcentral gyrus of the primary somesthetic cortex

12
Q

Proprioception to the face travels via what nucleus?

Crosses how?

Then where?

Final spot?

A

Main sensory nucleus

DCTT and TL

VPM

primary somesthetic cortex

13
Q

Which nuclei project to the cerebellum?

A

Subnuclei rostralis

Interpolaris

14
Q

Precise tactile and proprioception from the head to the cerebellum must coarse through what nucleus and structure?

A

Main sensory nucleus of V

Superior cerebellar peduncle

15
Q

Unilateral lesion of the Trigeminal nerve results in what?

A

Loss of sensation in Trigeminal dermatomes
Loss of jaw jerk reflex
Atrophy of muscles of mastication
Loss of ipsilateral and consensual corneal reflex

16
Q

Alternating analgesia is due to destruction of what?

Patients demonstrate what?

A

Primary fibers in descending tract of V
Secondary fibers in the SL

Ipsilateral hemianalgesia of the face
Contralateral hemianalgesia of the body

17
Q

Alternating Trigeminal hemiplegia is a result of what?

Results in what?

A

Unilateral destruction of the Trigeminal nerve and corticospinal tract (SL) in the pons

Ipsilateral Trigeminal anesthesia and paralysis
Contralateral spastic hemiplegia

18
Q

What is the only pseudounipolar neuron in the CNS?

A

Mesencephalic nucleus of CN V