DCML and Spinalthalamic

Question 1

what fibers go through the DCML?

Answer 1

a alpha
a beta
a delta

Question 2

a alpha
- size and info

Answer 2

size: 1
info
- proprioceptors

Question 3

a beta
- size and info

Answer 3

size: 2
info
- mechanoreceptors

Question 4

a delta
- size and info

Answer 4

size: 3
- pain and temperature

Question 5

c fibers
- size and info

Answer 5

size: 4
- temperature, pain, itch

Question 6

what stimuli does DCML with?

Answer 6

epicritic
- touch and vibration
proprioception
- information about limbs in space

Question 7

DCML pathway steps (4)?

Answer 7

1) enter spinal cord through dorsal horn and synapse in the dorsal column nuclei (spinal cord + medulla junction)
2) second order neuron decussate at medulla
3)synapse at ventral posterior nucleus with third order neuron
4) projects to the thalamus S1

Question 8

where does dcml synapse?

Answer 8

• dorsal column nuclei
• ventral posterior nucleus

Question 9

where does the dcml desscuate?
exact location and general location

Answer 9

• medulla
• in brain stem area = very high

Question 10

what happens when you lesion above the medulla?

Answer 10

loss of touch contralteral

Question 11

what happens when you lesion below the medulla?

Answer 11

loss of touch ipsilateral

Question 12

how do you damage the dcml?

Answer 12

lesioning axons that decussate in the medulla or dorsal column

Question 13

what aspect of the body is not involved in the dcml?

Answer 13

the face

Question 14

what information does the spinothalmatic pathway carry?

Answer 14

• protopathic component of somatosensory system: pain, temp, ithc

Question 15

what fibers go through the spinothalmatic pathway?

Answer 15

Adelta
C

Question 16

name the steps of the spinothalmatic pathway?

Answer 16

1) axons from dorsal root ganglia enter through dorsal horn
2) synapse in the dorsal horn with neuron that has a body in the substantia gelatinosa
3) second order decussates immediately in the spinal cord
4) synapses in the ventral posterior nucleus to third order neuron
5) goes to S1

Question 17

where does the spinothalmatic pathway synapse?

Answer 17

• spinal cord
• ventral posterior nucleus

Question 18

what happens when you damage the spino pathway?

Answer 18

loss of pain, itch contralateral

Question 19

how can you damage this pathway?

Answer 19

lesioning axons that decussate anywhere in the spinal cord