sensory and motor elements of periphery Flashcards

1
Q

What do A alpha motor fibres inervate and what do A alpha sensory do

A

skeletal muscle

proprioception

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2
Q

types of A alpha sensory fibres and orginination

A

1a muscle spindles

1b Golgi tendon organs

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3
Q

what do A gamma fibres innervate and originate

A

muscle spindles

dorsal root

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4
Q

name the sensory neurones

A

A beta
A delta
C fibres
C sympathetic

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5
Q

name the mechanoreceptors

A

messier corpuscle
merkel cell
pacinian corpuscle
ruffini ending

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6
Q

A beta fibres

A

touch and pressure

use mechanoreceptors

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7
Q

A delta fibres

A

nociceptors

fast pain and temp

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8
Q

C fibres

A

slow pain and temp

fibres and noiceptors

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9
Q

C sympathetic

A

post ganglionic sympathetic fibres

impulses from autonomic ganglia to organs

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10
Q

messier corpuscle

A

light touch

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11
Q

merkel cell

A

texture and object shape

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12
Q

pacinian corpuscle

A

vibration

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13
Q

Ruffini ending

A

tension in skin

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14
Q

what is sensory transduction

A

conversion of a physical stimulus into a string of action potentials that can be interpreted by the sensory cortex

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15
Q

describe sensory transduction

A
stimulus applied
deformation of tissue
altered permabilitu of receptor membrane
depolarisation
receptor potential graded
action potential
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16
Q

what does deformation of the tissue of pacinian corpuscle lead to

A

sodium influx and receptor potential

local circuit of current flow

17
Q

how does the pacinian corpuscle feed to the SC

A

dorsal root ganglion

18
Q

what is the pacinian corpuscle q

A

series of connective tissue lamella that responds to change rather than constant

19
Q

which receptors are slowly adapting

A

merkel

ruffini

20
Q

which receptor is fast adapting

A

pacinian corpucle

21
Q

what does the CNS determine from merkle or Ruffini receptors

A

strength and duration of stimulus

22
Q

what do nociceptors respond to

A

intense stimuli that may be damaging

23
Q

which receptors respond to temperatire

A

transient receptor potentials

24
Q

which axons will have lower thresholds?

A

larger ones e.g. A alpha

25
Q

describe neuromuscular transmission

A
AP leads to calcium influx
vesicles fuse with presynaptic membrenae
Ach diffuses across cleft
activates Act receptor 
sodium influx
musclce contraction