-
nociceptors: pain stimuli come in different varieties
polymodal
-
nociceptors: heat or cold
thermal
-
nociceptors: cut with something sharp
mechanosensitive
-
free nerve endings
nociceptors
-
reception of the stimulus
nociception
-
Pain and temperature pathway receptors are located in:
the dermis and epidermis
-
afferent fiber type that has brief, sharp pain
A-delta
-
afferent fiber type that transmits dull, prolonged pain
C
-
What part of the dermatomes share innervation?
boundaries of adjacent dermatomes share innervation
-
Afferent fibers of the pain and temperature pathway run to the spinal cord via _______
posterior root ganglion (1st order neuron)
-
Afferent fibers terminate in the _____ where it synapses with __________ and ____________
- posterior gray horn
- 2nd order neuron
- interneurons
-
The interneurons synapse with _________ in the _______ forming ________
- motoneurons
- anterior gray horn
- reflex arcs
-
Send terminals into dorsolateral column (_______), ascend and descend to adjacent spinal cord segments- _________
- Substantia gelantinosa
- second overlap
-
third overlap
multisegmental
-
Cross to contralateral side via ______
ventral white commissure
-
Enters lateral white column and ascends via ______ to ________
- lateral spinothalamic
- VPL
-
In the VPL, synapses with 3rd order neurons and ascends to the _______ via the ______
- postcentral gyrus (primary somatosensory area)
- Posterior internal capsule
-
Sensation sent back to point of stimulus, visceral pain not highly localized in brain (vague, spread), pain experienced on surface of the body
Referred pain
-
Cerebellum interprets impulse as arising form the skin of the missing limb
phantom pain
-
spinal cord degeneration
syringomyelia
-
Syringomyelia is spinal cord damage of lamina ___
X
-
Symptom of syringomyelia wher some sensations are lost but some are preserved
dissociative anesthesia
-
mechanoreceptors for the pressure and crude touch pathway are in the ____
dermis
-
The first order neurons enter ______ where it ____.
- ipsilateral dorsal white column
- bifurcates
-
Pressure and crude touch pathway afferent fibers run from the spinal cord via _____
DRG (1st order neuron)
-
1st branch into ____
posterior gray horn
-
2nd branch ascends via _____ and synapses with ______
- dorsal white column
- 2nd order neuron
-
Both branches cross and enter _____ and form the ________ which enters the ______ and synapses with ______
- ventral white column
- ventral spinothalamic tract (part of lateral tract)
- VPL
- 3rd order neurons
-
Runs through the ______ to the postcentral gyrus
internal capsule
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