sensory and motor elements of periphery

Question 1

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

Answer 1

skeletal muscle

proprioception

Question 2

types of A alpha sensory fibres and orginination

Answer 2

1a muscle spindles

1b Golgi tendon organs

Question 3

what do A gamma fibres innervate and originate

Answer 3

muscle spindles

dorsal root

Question 4

name the sensory neurones

Answer 4

A beta
A delta
C fibres
C sympathetic

Question 5

name the mechanoreceptors

Answer 5

messier corpuscle
merkel cell
pacinian corpuscle
ruffini ending

Question 6

A beta fibres

Answer 6

touch and pressure

use mechanoreceptors

Question 7

A delta fibres

Answer 7

nociceptors

fast pain and temp

Question 8

C fibres

Answer 8

slow pain and temp

fibres and noiceptors

Question 9

C sympathetic

Answer 9

post ganglionic sympathetic fibres

impulses from autonomic ganglia to organs

Question 10

messier corpuscle

Answer 10

light touch

Question 11

merkel cell

Answer 11

texture and object shape

Question 12

pacinian corpuscle

Answer 12

vibration

Question 13

Ruffini ending

Answer 13

tension in skin

Question 14

what is sensory transduction

Answer 14

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

Question 15

describe sensory transduction

Answer 15

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

Question 16

what does deformation of the tissue of pacinian corpuscle lead to

Answer 16

sodium influx and receptor potential

local circuit of current flow

Question 17

how does the pacinian corpuscle feed to the SC

Answer 17

dorsal root ganglion

Question 18

what is the pacinian corpuscle q

Answer 18

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

Question 19

which receptors are slowly adapting

Answer 19

merkel

ruffini

Question 20

which receptor is fast adapting

Answer 20

pacinian corpucle

Question 21

what does the CNS determine from merkle or Ruffini receptors

Answer 21

strength and duration of stimulus

Question 22

what do nociceptors respond to

Answer 22

intense stimuli that may be damaging

Question 23

which receptors respond to temperatire

Answer 23

transient receptor potentials

Question 24

which axons will have lower thresholds?

Answer 24

larger ones e.g. A alpha

Question 25

describe neuromuscular transmission

Answer 25

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