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Flashcards in Sensory Physiology Deck (34):
1

Sensory receptors are depolarized except

Photorecptors: hyperpolarized

2

Mechanoreceptor:
an encapsulated receptor found deep in the skin throughout the body as well as in fascial layers where they detect indentation of the skin (pressure) and movement across the surface (high-frequency vibration)

Pacinian corpuscle

3

Mechanoreceptor:
elongated, encapsulated receptor found in the dermal pegs of glabrous skin and is especially abundant on lips and fingertips
movement of objects, low-frequency vibration

Meissner's corpuscle

4

Mechanoreceptor: heavy and prolonged touch (pressure), joint rotation

Ruffini's corpuscle

5

Mechanoreceptor:
an expanded tip tactile receptor found in the dermis of hairy skin that is specialized to detect continuously applied touch sensation
localizing touch sensation and to determine texture

Merkel's disk

6

Myopia

biconcave lens

7

Hyperopia

convex lens

8

Photoreceptors: greater sensitivity

rods

9

Photoreceptors: greater acuity

cones

10

Which of the photoreceptors adapt first in the dark?

cones

11

Tactile cutaneous stimulation involving ___ can lead to pain suppression

type A–beta fibers

12

Layer __ of the somatosensory cortex receives the
bulk of the input from the somatosensory nuclei of the
thalamus.

layer IV

13

organ of corti is contained in

scala media

14

responsible for the inward-directed sodium current in the outer segments of the photoreceptors in dark current

cGMP

15

Outer/inner cells transmit majority of auditory stimuli

inner cells

16

stereocilia are embedded in what membrane? A) Basilar B) Reissner’s C) Tectorial D) Tympanic E) Vestibular

tectorial

17

Which of the following sensory systems has the smallest range of intensity discrimination? A) Auditory B) Gustatory C) Olfactory D) Somatosensory E) Visual

olfactory

18

most cells in the nervous system are depolarized by sodium except

sterocilia: potassium

19

neurotransmitter of retinal ganglion cells

glutamate

20

which tactile receptor forms the Iggo dome receptors?

Merkel disc

21

decussation of dorsal column

near the medulla

22

decussation of anterolateral tract

immediately

23

nerve fibers of dorsal column

large myelinated

24

nerve fibers of anterolateral tract

small unmyelinated

25

thalamus: dorsal column-medial lemniscus

VPL

26

thalamus: trigeminothalamic pathway

VPM

27

thalamus: anterolateral system

VPI

28

neurotransmitter for fast pain

glutamate

29

neurotransmitter for slow pain

substance P

30

Photoreceptor: adapts more rapidly

cones

31

Photoreceptor: adapts longer

rods

32

nerve fibers for olfaction

C fibers

33

vestibular apparatus: linear acceleration

otolith organs

34

vestibular apparatus: angular acceleration

semicircular canals