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Neuroscience 2 > Somatosensory Tracts > Flashcards

Somatosensory Tracts Flashcards

1
Q

what sensors do proprioception?

A

receptors in joint capsules- position and speed of movement

receptors in muscles detect tension and stretch- muscle spindle and golgi tendon organs

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2
Q

what does each peripheral nerve fiber type do?

A

A-a- largest- muscle spindles
A-b- touch, pressure, and joint proprioception
A-g motor and muscle spindles
A-d- pain

B- sympathetic preganglionic

C- pain, thermo

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3
Q

first, second, third order neurons

A

first- peripheral axon, cell body in DRG

second- CNS tract ends in thalamus

third- thalamocortical

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4
Q

what are the two pathways do tactile and proprioceptive info?

A

dorsal column/medial lemniscus

trigemninal mechanosensory system

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5
Q

what are the two pathways that do pain and crude touch

A

anterolateral (spinothalamic)

spinal trigeminal

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6
Q

what two pathways do unconscious proprioception

A

dorsal spinocerebellar

cunceocerebellar

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7
Q

are ALT receptors encapsulated or no? what do they sense?

A

not encapsulated- free nerves- Ad and C fibers

pain/crude touch

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8
Q

heat/cold receptor range

A

heat- 29-45 C
cold 5-40 C

TRP receptors

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9
Q

fast v slow pain

A

fast A-d- sharp pain

slow- C- dull, aching, burning

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10
Q

sensitization of nociceptos

A

when excited, become more sensitized via prostaglandins/bradykinins

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11
Q

substance P

A

released by activated nocioceptors, cause dilation, swelling and histamine

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12
Q

allodynia

A

benign stimuli percieved as dangerous

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13
Q

hyperalgesia

A

painful stimuli perceived as more painful

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14
Q

where do ALT fibers dessucate

A

spinal cord, w/in a few segments of entering

dessucate through the anterior commissure

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15
Q

how are the fibers in the ALT organized?

A

legs lateral, arms medial, trunk in between

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16
Q

where do ALT neurons synapse in thalamus?

A

VPL nucleus- travel to primary somatosensory cortex in postcentral gyrus

17
Q

periaqueductal gray

A

pain modulating pathways that project to substantia gelatinosa

18
Q

gate control theory of pain

A

descending inputs synapse on interneurons that release inhibitor NTs on nocioceptor synapses

19
Q

what mechanoceptors do fine touch?

A

meissner corpuscle- fine touch
pacininan corpuscle- pressure
ruffini ending- stretch

20
Q

where do first order fibers synapse in the dorsal columns?

A

the gracile and cuneate nucleus to internal arcuate fibers

21
Q

second order neurons in DC-ML

A

from gracile/cuneate nucleus, thru internal arcuate fibers, and up to VPL

22
Q

organization with medial lemniscus

A

legs is most anterior, arms most posterior. slowly legs swing laterally while arms stay medially

23
Q

the only sensory ganglion cells inside the CNS

A

proprioceptive sensory fibers of trigeminal. the rest of the trigeminal sensory cell bodies are in the trigeminal ganglion

24
Q

difference between the 3 sensory trigeminal ganglia

A

principle nucleus (chief) - well localized touch/pressure

mesencephalic- proprioceptive

spinal nucleus- pain/temp

25
Q

second order trigeminal touch neurons

A

anterior/ventral trigeminothalamic tract

some ipsilateral fibers

26
Q

where do second order neurons for trigeminal touch terminate

A

VPM

27
Q

spinal tract of the trigeminal nerve

A

enter w/ trigeminal nerve in pons, run caudally

conveys pain/temp

ipsilateral sensation

28
Q

second order neurons of spinal nucleus of trigeminal

A

anterior trigeminothalamic

contralateral, runs near medial lemniscus

synapses at VPM

29
Q

reflexs of trigeminal

A 
corneal reflexes (motor 7)
tearing (motor 7)
cough and sneeze
oculocardiac (motor 10)
jaw jerk (motor 5)
30
Q

spinal reticular fibers

A

collateral spinothalamic

31
Q

dorsal spinocerebellar pathway

A

ipsilateral- arising from muscle spindles, golgi tendon

unconscious proprioception to cerebellum

only lower body

32
Q

nucleus dorsalis

A

where the dorsal spinocerebellar first order neurons synapse with second order neurons in the spinal cord

33
Q

cunceocerebellar

A

upper limb equivalent of dorsal spinocerebellar tract

ascends w/ fasiculus cuneatus

second order neurons arise from cuneate nucleus

ispilateral

Neuroscience 2 (7 decks)

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