Unit 3: Pain and Pathways Flashcards Preview

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Flashcards in Unit 3: Pain and Pathways Deck (39):
1

Fast pain

Spinothalamic, initial and immediate sharp sensation

2

Slow pain

Spinolimbic, dull throbbing ache following fast pain that is not well localized

3

Fast pain pathway

neurons bring info to dorsal horn, cross midline go to thalamus, thalamus to cerebral cortex via VPL

4

Facial pain pathway

fast pain travels to trigeminal, to pons down to spinal nucleus, crosses and ascends trigeminal lemniscus to thalamus, to cortex

5

Arrangement of facial pain pathway can lead to?

crossed analgesia

6

Lesion cerebrum, midbrain and pons causes

Contralateral paralysis

7

Medial pain system

divergent ascending network of neurons, uses several pathways, not like fast pain

8

Activity of medial pain system elicits?

affective, motivational, witdrawal, arousal, and autonomic responses

9

Spinolimbic tract perceives

Pain

10

Which tracts are involved with arousal, motivation, reflexes, control of sensory?

Spinoreticular, spinomesecephalic

11

Spinomesencephalic tract

Involved with visual auditory reflex, carries pain info to superior colliculus and periaqueductal gray matter

12

Periaqueducatl gray matter is part of?

Descending pain control system

13

Periaqueducatl gray matter is part of?

Descending pain control system

14

Spinoreticular tract

synapse in reticular formation, modulates attention, arousal, can disturb sleep cycle

15

Spinolimbic tract

Transmit slow pain info, emotional response to pain and reflexive movement

16

Cerebellar pathways

Posterior spinocerebellar, and cuneocerebellar

17

Cuneocerebellar pathway

Transmits info from upper r half of body and arms, 2nd synapse with lateral cuneate nucleus, entirely ipsilateral ascending

18

Posterior spinocerebellar pathway

Transmits info from lower half of body and legs, 2nd synapses with nucleus dorsalis, entirelly ipsilateral

19

Basal ganglia

receives input from motor and sensory parts of brain to aid in control of movement

20

Motor loop of basal ganglia

excites putamen, inhibits globus pallidus, thus activating thalamus, intiates movement commands, stopping cortical activation inhibits thalamus again

21

Globulus pallidus

always actively inhibiting the thalamus

22

Parkinson's

Substantia nigra degenerates reducing inhibition of GP, VL nucleus in thalamus cannot depolarize as readily

23

Hungtington's

Loss of inhibitory neurons results in VL firing without restraint

24

Cerebellum function

Maintain posture, coordinate contraction sequence, provides error correction in slow movement

25

Vermis contributes to

ventromedial pathways

26

Pontine nuclei

axons from layer V pyramidal cells in the sensorimotor cortex form massive projections to pons

27

Corticopontocerebellar projections

20 times larger than puramidal tract, pons supplies input to CB outputs flow through the deep nuclei and to thalamus, thalamic projections terminate on primary motor cortex to coordinate movement

28

Corticopontocerebellar projections

20 times larger than puramidal tract, pons supplies input to CB outputs flow through the deep nuclei and to thalamus, thalamic projections terminate on primary motor cortex to coordinate movement

29

Pyramindal tract

Direct order to make a muscle move, 2 motor neurons

30

Corticospinal tract

voluntary control of torso including limbs, sequence of two motor neurons, crossover at the brain stem

31

Corticobulbar tract

motor control of head via cranial nerves, crossover and stay in brainstem at cranial nerve nuclei

32

Internal capsule

Large confluence of the descending axons

33

Ventromedial pathway

indirect cortical control-proximal musculature, uses sense info about balance, vision, body position; can activate LMN

34

Lateral pathways

Direct cortical control-distal musculature

35

Vestibulospinal tract

posture and balance

36

Tectospinal tract

Orienting response

37

Pontine

Enhances antigravity reflexes

38

Medullary

Liberates antigravity muscles from reflex during voluntary movements

39

Motor cortex

Intitiates voluntary movement instruction along laeral paths