Lecture: Ascending Sensory Pathways II Flashcards Preview

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Flashcards in Lecture: Ascending Sensory Pathways II Deck (13)
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1
Q

in which cranial nerves is general sensation from the head carried?

A

V
VII
IX
X

2
Q

where do sensory fibres from the cranial nerves carrying sensation from the head run?

A

Trigeminal Sensory Nucleus

part of the Trigeminal Sensory Pathway

3
Q

What are the major divisions of the Trigeminal Sensory Nucleus

A

From rostral to caudal:
Mesencephalic nucleus
Pontine/Chief sensory nucleus
Spinal Nucleus

4
Q

To which part of the TSN does pain and temperature information travel?

A

The most caudal part of the spinal nucleus

the caudal end

5
Q

To which part of the TSN does touch and pressure information travel?

A

To the most rostral part of the spinal nucleus

the caudal end

6
Q

Where are the primary neuron cell bodies for pain, temperature, touch, pressure and discriminatory touch pathways?

A

In the trigeminal ganglion

situated prior to entry to the brainstem and the TSN

7
Q

What type of fibres carry information regarding pain, temperature, touch and pressure?

A

Thin, slow fibres

8
Q

What would be the consequences of a lesion on the right of the medulla

A

loss of sensation from RIGHT side of face

loss of sensation from the LEFT side of body

9
Q

What is different about Propriocetion fibres travelling to the mesencephalic nucleus?

A

First order neuron cell body not located in the peripheral ganglia, but actually within the TSN itself, in mesencephalic nucleus

10
Q

Where do fibres carrying information about discriminatory touch travel?

A

Travel to Pontine (chief sensory) nucleus

large one in the middle of TSN

11
Q

What type of fibres carry information about discriminatory touch?

A

Large diameter
myelinated
fast conduction fibres

12
Q

How do secondary fibres ascend to the thalamus?

A

In the Trigeminothalamic tract

to the ventroposteromedial thalamus (VPM)

13
Q

How do fibres in the proprioception pathway synapse?

A

Unlike the other pathways, does not synapse in the TSN but alongside it, next to the mesencephalic nucleus
+ gives off a motor branch which synapses in trigeminal motor nucleus - sends a branch back to msucles of face, e.g mastication (jaw jerk reflex)