ascending sensory pathways 1

Question 1

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

Answer 1

thin, poorly myelinated or unmyelinated fibres - slow conduction

Question 2

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

Answer 2

large diameter, thick, heavily myelinated fibres - fast conduction

Question 3

how many neurons are in a general sensory pathway?

Answer 3

3

Question 4

where do the cell bodies of sensory pathway reside?

Answer 4

dorsal root ganglia

Question 5

which neutron always crosses the midline?

Answer 5

2nd order neurons

Question 6

which neutron projects to the thalamus?

Answer 6

3rd order neuron

Question 7

which pathway is pain, temp, touch and pressure?

Answer 7

spinothalamic

Question 8

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

Answer 8

the spinothalamic tract

Question 9

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

Answer 9

ventral white commissure

Question 10

which pathway is for discriminative touch and proprioception?

Answer 10

dorsal column pathway

Question 11

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

Answer 11

in the internal arcuate fibres at level of closed medulla

Question 12

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

Answer 12

the medial lemniscus

Question 13

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

Answer 13

ipsilaterally - cross at level of closed medulla

Question 14

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

Answer 14

contralaterally - cross at level of spinal cord entry