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Flashcards in somatosensory II Deck (31):
1

spinothalamic tract projects to

VPL and intralaminar nuclei of thalamus

2

spinomesencephalic tract projects to

periaquaductal gray and tectum

3

spinoreticular tract projects to

reticular formation of medulla, pons, midbrain

4

spinobulbar tract projects to

brainstem nuclei

5

spinohypothalamic tract projects to

hypothalamus

6

allodynia

body says "turn down for what?!"
this is CENTRAL SENSITIZATION so where normal sensory information (like touch) can be percieved as pain.

7

sensory neurons enter the dorsal roots and bifurcate.
whats medial?
whats lateral?

medials are more MEATY (large fibers); synapse on lamina III-V
laterals are small fibers; synapse on lamina I, II, V

8

senses in ALS that are different from PCML system

hypesthesia, paresthesia, anesthesia

9

feel the burn: (pain and temp)
what are the fast burners? why?
lamina?

A delta are lightly myelinated
1 and 5

10

feel the burn: (pain and temp)
what are the slow burners? why?
lamina?

C are unmyelinated
1 and 2 and 3 (specific tracts in ALS have different lamina for C fibers)

11

lamina 2/3 is responsible for

cock-blocking the incoming pain signal.
SUBSTANTIA GELATINOSA it is the gate keeper for which signals are painful. pain is modulated at the level of the dorsal horn

12

lamina of nucleus proprius

4,5,6

13

what is a triple response to pain

you get fast pain sensation(A delta). slow pain sensation(C fibers), and inflammation

14

what is the role of hypothalamus in pain

connects the pain to emotion and ALS
=> this is is why people like S&M

15

what is the role of the insular cortex in pain

connections give you the "dislike" part of feeling pain

16

what is the role of the hippocapus in pain? amygdala?

hippocampus does pain memory
amygdala does the fear and anxiety part of pain

17

you get stuck by a needle. what is the role of substance P in pain

1 - substance P (a peptide) is in nerves
2 - it is released at the site to bind with arterioles leading to the FLARE RESPONSE
3 - it binds to mast cells for inflammation/histamine - WHEAL RESPONSE

18

what neurons DESCEND and synapse on lamina 2/3? why?

RAPHESPINAL pain modulation!
(remember?! thats what happens in those two lamina!!)

19

I sprayed you with pepper spray.
what system is it?
fibers?
synapse?

paleospinothalamic tract
C fibers
lamina II and III

20

you accidentally got warming lube on your face
what system is it?
first order neurons?
second order neurons?
decussate?

anterior trigeminothalamic tract is most important
1 = trigeminal ganglion
2 = spinal trigeminal nucleus
decussate to form the ventral trigeminothalamic tract

21

what are the cock-blocker cells of the dorsal horn?

enkephalinergic interneurons. they work PRE-synaptically.

22

opiates are also cock-blockers. How?

made in the PAG, they "go down" on the raphe nucleus so that when the pain signal comes in, it gets turned off

23

serotonin is a ____

cock-blocker. but its for the primary aferents. aka the pain signal gets to the spinal cord, but serotonin kills the mood

24

trans cutaneous nerve stimulation treatment is based off of

gate control theory

25

rhizotomy is

transection of dorsal roots

26

ventral trigeminothalamic tract mediates?

pain and temp sensation from the face and oral cavity

27

dorsal trigeminothalamic tract mediates?

tactile discrimination and pressure sensation from the face and oral cavity (meissner/pacinian corpuscles)

28

afferent/efferent limb of corneal reflex

ophthalmic n (V1)
facial n

29

afferent/efferent limb jaw jerk reflex

mandibular n (V3)
mandibular n (V3)

30

afferent/efferent limb tearing (lacrimal) reflex

ophthalmic n (V1)
facial n

31

afferent/efferent limb oculocardiac reflex

ophthalmic n (V1)
vagal n