Chapter 16: Sense Organs Flashcards Preview

Human Anatomy & Physiology 1 > Chapter 16: Sense Organs > Flashcards

Flashcards in Chapter 16: Sense Organs Deck (94)
Loading flashcards...
1

sensory receptor

a structure that detects a stimuli

2

transduction

the conversion of one form of energy to another
(stimulus energy to nerve signal)

3

sensation

an awareness of the stimulus

4

most ____ signals delivered to the CNS produce no ____ sensation

sensory; conscious

5

What are the 4 types of info transmitted by sensory receptors?

-modality
-location
-intensity
-duration

6

modality

type of stimulus or the sensation it produces
(vision, hearing, taste)

7

What does the brain use to interpret what modality a signal represents?

labeled line code

8

Why does the body have a labeled line code?

because all action potentials are the same

9

location

encoded by which nerve fibers are issuing signals to the brain

10

area that detects stimuli for a sensory neuron

receptor field

11

intensity

encoded in 3 ways
-which fibers are sending signals
-how many fibers are doing so
-how fast these fibers are firing

12

duration

how long the stimulus last

13

phasic receptors

generate a burst of action potentials when first stimulated, but then dull down after the stimulus adapts QUICKLY even though the action potential continues

14

tonic receptors

adapt slowly, generate nerve signals more steadily

15

an example of a tonic receptor is?

proprioceptors

16

How can receptors be classified? (3)

-by modality
-by distribution
-by origin of the stimuli

17

Classification of receptor?
thermoreceptors, photoreceptors, chemoreceptors, mechanoreceptors, nocireceptors

by modality

18

Classification of receptor?
exteroceptors, interoceptors, proprioceptors

by origin of the stimuli

19

Classification of receptor?
general (somoesthetic) senses: widely distributed

by distribution

20

What are 4 types of encapsulated nerve endings?

-tactile corpuscles
-krause end bulbs
-lamellar corpuscles (phasic)
-bulbous corpuscles (tonic)

21

From receptors to final destinations, most signals travel by way of _____ neurons

3

22

first order neuron (somatosensory projection pathways)

afferent (toward CNS)

23

first order neuron
from body, enter the __ ___ of the spinal cord
from heard, enter ___ and the ____ via cranial nerves

dorsal horn
pons; medulla

24

Touch, pressure, and proprioceptors are on _______; while heat & cold are on _____

large myelinated axons; small unmyelinated axons

25

second order neurons (somatosensory projection pathways)

interneurons the decussate to opposite sides in the spinal cord

26

Where do second order neurons end up?

in the thalamus except for proprioceptors (cerebellum)

27

third order neurons (somatosensory projection pathways)

thalamus to primary cortex of cerebrum (postcentral)

28

pain

discomfort caused by tissue injury

29

nociceptors

provide different pain sensations

30

somatic pain

skin, muscle, joins