Mechanoreception No2 Flashcards

1
Q

what is mechanoreception

A

physiological process mechanical stimuli detected sometimes sensation of touch but some just feedback info proprioception

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2
Q

what is the purpose of a small receptive field

A

degree of fine perception - pixel analogy

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3
Q

what are the mechanoreceptors involved in intensity and duration and also velocity

A

Merkel cells

Ruffini

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4
Q

what type, receptive field nd adaption of merkel cells

A

SA I
small receptive field
slow adaptation

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5
Q

what type, receptive field and adaptation of ruffini cells

A

SA II
large receptive field
slow adapting

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6
Q

what mechanorectors roles
velocity
acceleration
vibration

A

meissner

Paccinian

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7
Q

what is the type, receptive field, adaptation of messier cells

A

RA I
small receptive field
rapd adaptation

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8
Q

what si the type, receptive field, adaptation of paccinian

A

RA II
large receptive field
rapid adaptive

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9
Q

what are PDLM’s aligned wth

A

collagen fibres

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10
Q

what are PDLM’s

A

ruffini ending deep, large receptive field and slow adapt

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11
Q

what do PDLM’s respond to

A

PDL tension

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12
Q

where is there more tension on the PDLM

A

moe tension at apex as move more

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13
Q

what d forces from the labile side of the tooth activate

A

from labile side only activate mechanoreceps with tension, palatal side

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14
Q

how sesntitve PDLM

A

very sensitive
small movements: 8.5uM
small forces:

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15
Q

what si the experiment to see fine motor control of PLDM

A

metal device between teeth
flexible bar peanut
transducer shows tension on peanut without breaking

without PDLM not able to have this fine control

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16
Q

what is stage 1 of sensory pathway

A

mehanorecpetion
transduction stimulus
propagation along primary afferent

17
Q

what is stage 2 of sensory pathway

A

processing at first synapse

bigeminal nuclei or spinal nuclei

18
Q

what is stage 3 of sensory pathway

A

processing in thalamus

19
Q

what is stage 4 of sensory pathway

A

conscious perception

somatosensory cortex

20
Q

see general sensory pathway

A

diagram

21
Q

what is a dermatome

A

area of skin innervated by the
trigeminal div (max, man, opthalmic)
single spinal segment

22
Q

what happens when dermatomes manifest with bac

A

microorganisms in ganglia such as herpes simplex, shingles

23
Q

what are the trigeminal afferent nerves

A

cell bodies in

  • V ganglion
  • V mesencephalic nucleus
24
Q

what is the purpose of V mesencephalic nucleus

A

proprioception

25
Q

where do he trigeminal afferent nerves enter

A

at brainstem via trigeminal root

26
Q

where re the primary afferent cell bodies for V path

A
V ganglion 
mesencephalic Nucleus (PDL)
27
Q

where si synapse for V path

A

mainly in main sensory nucleus

project to spinal V nuclei as well

28
Q

where do V path project to

A

sensory cortex via thalamus contralaterally

oralis, interpliss, cadalis

29
Q

what is a processing process at the first synapse

A
surround inhibition (pre syn inhibition)
sharpens touch perception
30
Q

describe surround inhibitor

A

affected nerves give off branches to inhibitory interneurones, presyn inhibitory to nerves

stop peripheral activation of nerves focused to sharpen edges sometimes faded in middle

31
Q

what gives a proportional representation of sensory of body

A

sensory homunculus in somatosenoy cortex