Lecture: Ascending Sensory Pathways II Flashcards Preview

C&M Term 2 > Lecture: Ascending Sensory Pathways II > Flashcards

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

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

V
VII
IX
X

2

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

Trigeminal Sensory Nucleus

part of the Trigeminal Sensory Pathway

3

What are the major divisions of the Trigeminal Sensory Nucleus

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

4

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

The most caudal part of the spinal nucleus
the caudal end

5

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

To the most rostral part of the spinal nucleus
the caudal end

6

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

In the trigeminal ganglion
situated prior to entry to the brainstem and the TSN

7

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

Thin, slow fibres

8

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

loss of sensation from RIGHT side of face

loss of sensation from the LEFT side of body

9

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

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

10

Where do fibres carrying information about discriminatory touch travel?

Travel to Pontine (chief sensory) nucleus
large one in the middle of TSN

11

What type of fibres carry information about discriminatory touch?

Large diameter
myelinated
fast conduction fibres

12

How do secondary fibres ascend to the thalamus?

In the Trigeminothalamic tract
to the ventroposteromedial thalamus (VPM)

13

How do fibres in the proprioception pathway synapse?

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)