chapter 13-touch Flashcards Preview

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Flashcards in chapter 13-touch Deck (34):
1

somatosensation

collective term for sensory signals from the body; external

2

kinesthesis

the perception of the position and movement of our limbs in space; internal

3

proprioception

perception mediated by kinesthetic and vestibular receptors; internal

4

touch receptors

embedded in outer layer and underlying layer of skin

5

epidermis

outer layer of skin

6

dermis

underlying layer of skin; nutritive and connective tissues, within which lie the mechanoreceptors

7

SA receptors

slow adapting

8

FA

fast adapting

9

SA I receptor

slow adaption, small receptive field; texture perception, pattern/form

10

SA II receptor

slow adaption, large receptive field; finger position

11

FA I receptor

fast adaptation, small receptive field; meissner corpuscle; low-frequency vibration detection, stable grasp

12

FA II receptor

fast adaptation, large receptive field; pacinian corpuscle; high-frequency vibration detection, fine texture perception

13

kinesthetic receptors

mechanoreceptors in muscles, tendons and joints; stretched and pulled to get response

14

kinesthetic receptors play important role in what

sense of where limbs are, what kinds of movements are made

15

muscle spindle

sensory receptor located in a muscle that senses its tension

16

importance of kinesthetic receptors from case of who

ian waterman

17

thermoreceptors

sensory receptors that signal information about changes in skin temperature; warmth and cold fibers

18

nociceptors

sensory receptors that transmit information about noxious stimulation that could damage skin

19

what are the three types of nociceptors

extreme heat/cold, split/slice/tear, chemical--free nerve endings

20

spinothalamic pathway

carries most of the information about skin temperature and pain (slower); free nerve endings; unmeyelinated

21

dorsal column-medial lemniscal (DCML)

carries signals from skin, muscles, tendons, and joints (fast); mechanoreceptors; myelinated

22

phantom limb

sensation perceived from a physically amputated limb of the body; parts of brain listening to missing limbs not fully aware of altered connections, so they attribute activity in these ares to stimulation from missing limb

23

touch sensations are represented how in the brain

somatotopically

24

primary somatosensory cortex

S1, parietal lobe

25

homunculus

maplike representation of regions of the body in the brain; adjacent areas on skin connect to adjacent areas in brain

26

cortical magnification

some body parts (hands, lips) occupy a much greater cortical area than others (torso) even though they are physically smaller

27

von Frey esthesiometer

filaments of varying diameter; face is most sensitive, lower extremities less sensitive

28

two point threshold

minimum distance at which two stimuli are just perceptible as separate; extremities (fingertips, face, toes) show highest acuity

29

haptic perception

knowledge of the world, such as the properties of objects that is derived from sensory receptors in skin, muscles, tendons and joints; touch and kinestesis=end result; 96% correct identification

30

fMRI research for haptic perception

ventral (what) and dorsal (where) regions

31

nerve endings for SA I

merkel cells

32

nerve endings for SA II

ruffini ending

33

nerve endings for FA I

meissner corpuscle

34

nerve endings for FA II

Pacinian corpuscle