different types of receptors

Question 1

what are the different types of nerve endings?

Answer 1

free nerve endings and encapsulated nerve endings

Question 2

free nerve endings

Answer 2

pain
thermal
tickle
itch
some touch

Question 3

encapsulated nerve endings

Answer 3

touch pressure and vibration

Question 4

what type of nerve senses touch

Answer 4

encapsulated, large diameter, myelinated A fibres

Question 5

what type of nerve senses pressure

Answer 5

encapsulated, large diameter, myelinated A fibres

Question 6

what type of nerve senses vibration

Answer 6

encapsulated, large diameter, myelinated A fibres

Question 7

what type of nerve senses itch

Answer 7

free nerve ending, small diameter, unmyelinated C fibres

Question 8

what type of nerve senses tickle

Answer 8

free nerve ending, small diameter, unmyelinated C fibres

Question 9

what are the different touch receptors?

Answer 9

meissner corpuscle
hair root plexus
merkel disc
ruffini corpuscle

Question 10

which touch receptors are rapidly adapting?

Answer 10

meissner corpuscle

hair root plexus - around hair follicle

Question 11

which touch receptors are slow adapting?

Answer 11

merkel disc

ruffini corpuscle

Question 12

meissner corpuscle

Answer 12

tactile

hairless skin - hands, lips, tongue

Question 13

hair root plexus

Answer 13

around hair follicle

Question 14

merkel disc

Answer 14

fine touch

free nerve endings

Question 15

ruffini corpuscle

Answer 15

encapsulated
deep in dermis
sensitive to stretching during movement

Question 16

what detects pressure

Answer 16

pacinian/ lamellar corpuscle - rapidly adapting

Question 17

what detects vibration?

Answer 17

all corpuscles

sensation due to combination of rapidly repetitive signals

Question 18

pain sensation

Answer 18

nociceptors
very little adaptation
everywhere except brain

Question 19

proprioception

Answer 19

kinesthesia 
info about muscle contraction, tension in tendons and position of joints
slowly adapting
muscle spindles
tendon organs
joint kinesthetic receptors

Question 20

what is kinesthesia?

Answer 20

perception of motion

Question 21

what do muscle spindles do?

Answer 21

monitor length of muscle

Question 22

what do tendon organs do?

Answer 22

protect from excessive tension

Question 23

what do joint kinesthetic receptors do?

Answer 23

joint position and movement

Question 24

thermal sensation

Answer 24

free nerve endings

rapidly adapting, but continue to fire at low frequencies

Question 25

cold receptors

Answer 25

abundant
connected myelinated A fibres or unmyelinated C fibres
between 10-40 degrees
painful if below 10 degrees

Question 26

warm receptors

Answer 26

between 32-48 degrees

painful if above 48 degrees

Question 27

thalamic lesion

Answer 27

sensory loss throughout opposite side

Question 28

brainstem lesion

Answer 28

contralateral sensory loss below face and ipsilateral on face

Question 29

central cord lesion

Answer 29

asymmetrical and dissociated areas of loss

not all sensations are lost

Question 30

unilateral cord lesion

Answer 30

contralateral spinothalamic loss with ipsilateral weakness and dorsal column loss below lesion

Question 31

transverse cord lesion

Answer 31

loss of all modalities - including motor below lesion