Mechanoreception No2

Question 1

what is mechanoreception

Answer 1

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

Question 2

what is the purpose of a small receptive field

Answer 2

degree of fine perception - pixel analogy

Question 3

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

Answer 3

Merkel cells

Ruffini

Question 4

what type, receptive field nd adaption of merkel cells

Answer 4

SA I
small receptive field
slow adaptation

Question 5

what type, receptive field and adaptation of ruffini cells

Answer 5

SA II
large receptive field
slow adapting

Question 6

what mechanorectors roles
velocity
acceleration
vibration

Answer 6

meissner

Paccinian

Question 7

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

Answer 7

RA I
small receptive field
rapd adaptation

Question 8

what si the type, receptive field, adaptation of paccinian

Answer 8

RA II
large receptive field
rapid adaptive

Question 9

what are PDLM’s aligned wth

Answer 9

collagen fibres

Question 10

what are PDLM’s

Answer 10

ruffini ending deep, large receptive field and slow adapt

Question 11

what do PDLM’s respond to

Answer 11

PDL tension

Question 12

where is there more tension on the PDLM

Answer 12

moe tension at apex as move more

Question 13

what d forces from the labile side of the tooth activate

Answer 13

from labile side only activate mechanoreceps with tension, palatal side

Question 14

how sesntitve PDLM

Answer 14

very sensitive
small movements: 8.5uM
small forces:

Question 15

what si the experiment to see fine motor control of PLDM

Answer 15

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

without PDLM not able to have this fine control

Question 16

what is stage 1 of sensory pathway

Answer 16

mehanorecpetion
transduction stimulus
propagation along primary afferent

Question 17

what is stage 2 of sensory pathway

Answer 17

processing at first synapse

bigeminal nuclei or spinal nuclei

Question 18

what is stage 3 of sensory pathway

Answer 18

processing in thalamus

Question 19

what is stage 4 of sensory pathway

Answer 19

conscious perception

somatosensory cortex

Question 20

see general sensory pathway

Answer 20

diagram

Question 21

what is a dermatome

Answer 21

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

Question 22

what happens when dermatomes manifest with bac

Answer 22

microorganisms in ganglia such as herpes simplex, shingles

Question 23

what are the trigeminal afferent nerves

Answer 23

cell bodies in

• V ganglion
• V mesencephalic nucleus

Question 24

what is the purpose of V mesencephalic nucleus

Answer 24

proprioception

Question 25

where do he trigeminal afferent nerves enter

Answer 25

at brainstem via trigeminal root

Question 26

where re the primary afferent cell bodies for V path

Answer 26

``` V ganglion mesencephalic Nucleus (PDL) ```

Question 27

where si synapse for V path

Answer 27

mainly in main sensory nucleus | project to spinal V nuclei as well

Question 28

where do V path project to

Answer 28

sensory cortex via thalamus contralaterally | oralis, interpliss, cadalis

Question 29

what is a processing process at the first synapse

Answer 29

``` surround inhibition (pre syn inhibition) sharpens touch perception ```

Question 30

describe surround inhibitor

Answer 30

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

Question 31

what gives a proportional representation of sensory of body

Answer 31

sensory homunculus in somatosenoy cortex