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Flashcards in ascending sensory pathways 1 Deck (14):
1

what type of fibres are associated with modalities essential to survival? - pain temp, touch, pressure

thin, poorly myelinated or unmyelinated fibres - slow conduction

2

what type of fibres are associated with modalities that increase detail? - discriminatory touch, proprioception

large diameter, thick, heavily myelinated fibres - fast conduction

3

how many neurons are in a general sensory pathway?

3

4

where do the cell bodies of sensory pathway reside?

dorsal root ganglia

5

which neutron always crosses the midline?

2nd order neurons

6

which neutron projects to the thalamus?

3rd order neuron

7

which pathway is pain, temp, touch and pressure?

spinothalamic

8

which tract do the secondary neurons ascend in the spinothalamic pathway?

the spinothalamic tract

9

where does the secondary axon cross the midline in the spinothalamic pathway?

ventral white commissure

10

which pathway is for discriminative touch and proprioception?

dorsal column pathway

11

where do the secondary neurons of dorsal column cross the midline?

in the internal arcuate fibres at level of closed medulla

12

what tract do the fibres ascend to the thalamus in the dorsal column pathway?

the medial lemniscus

13

do dorsal column fibres travel contra laterally or ipsilaterally in the cord?

ipsilaterally - cross at level of closed medulla

14

do spinothalamic fibres travel contra laterally of ipsilaterally in the cord?

contralaterally - cross at level of spinal cord entry