DCML and Spinalthalamic Flashcards
what fibers go through the DCML?
a alpha
a beta
a delta
a alpha
- size and info
size: 1
info
- proprioceptors
a beta
- size and info
size: 2
info
- mechanoreceptors
a delta
- size and info
size: 3
- pain and temperature
c fibers
- size and info
size: 4
- temperature, pain, itch
what stimuli does DCML with?
epicritic
- touch and vibration
proprioception
- information about limbs in space
DCML pathway steps (4)?
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
where does dcml synapse?
- dorsal column nuclei
- ventral posterior nucleus
where does the dcml desscuate?
exact location and general location
- medulla
- in brain stem area = very high
what happens when you lesion above the medulla?
loss of touch contralteral
what happens when you lesion below the medulla?
loss of touch ipsilateral
how do you damage the dcml?
lesioning axons that decussate in the medulla or dorsal column
what aspect of the body is not involved in the dcml?
the face
what information does the spinothalmatic pathway carry?
- protopathic component of somatosensory system: pain, temp, ithc
what fibers go through the spinothalmatic pathway?
Adelta
C
name the steps of the spinothalmatic pathway?
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
where does the spinothalmatic pathway synapse?
- spinal cord
- ventral posterior nucleus
what happens when you damage the spino pathway?
loss of pain, itch contralateral
how can you damage this pathway?
lesioning axons that decussate anywhere in the spinal cord
