Somatosensation

Question 1

What do the pacinian corpuscles sense?

Answer 1

Vibration and deep pressure

Question 2

What is the function of meissner’s corpuscles?

Answer 2

• They sense 2 point discrimination or fine touch

- allow specific, precise, location of stimuli

Question 3

What do merkel’s cells do?

Answer 3

They detect crude touch

Question 4

What do the hair follicle receptors do?

Answer 4

they detect light touch

Question 5

What do the ruffini corpuscles do?

Answer 5

they detect the stretching of the skin.

Question 6

When are thermal receptors are inactive at which points?

Answer 6

above 122 degrees F (50 dg C) and below 41 degrees F (5 dg C)

Question 7

What are the 4 types of nociceptors?

Answer 7

• mechanical- pinch of skin, median nerve compression.
• thermal hot
• thermal cold
• polymodal (activated by mechanical stimuli and chemicals released during inflammation)

Question 8

Proprioceptors are located where?

Answer 8

-muscles
-tendons
-ligaments
joint capusle

Question 9

What do muscle spindles sense?

Answer 9

detect the stretch in the muscle length

Question 10

What is the function of the golgi tendon organ?

Answer 10

Senses the muscle and tendon tension.

Question 11

What is somatosensation?

Answer 11

sensations experienced by the skin and subcutaneous tissue as well as by muscles, tendons, bones and joints

Question 12

Touch receptors are

Answer 12

• receptors that contain specialized nerve endings
• when stimulated by touch, an action potential is created
• all touch receptors convert a mechanical stimulus into a nerve impulse

Question 13

Where are pacinian corpuscles located?

Answer 13

• dermis
• subcutaneous tissue
• periosteum ligaments
• intramuscular connective tissue
• dorsal columns

Question 14

Where are meissners corpuscles located?

Answer 14

• located in skin mostly on fingertips

- dorsal columns

Question 15

Where are merkels cells located?

Answer 15

• fingertips
• lips
• external genitalia
• anterior spinothalamic

Question 16

What are hair follicle receptors made from?

Answer 16

small nerve fibers that wrap around roots of hair

Question 17

How do hair follicle receptors act?

Answer 17

they bend the hair which creates an action potential

Question 18

where are hair follicle receptors found?

Answer 18

• all over hair skin

- anterior spinothalamic

Question 19

Where are ruffini corpuscles found?

Answer 19

• near fold of skin at joints and beneath fingernails and toenails
• anterior spinothalamic

Question 20

Where are thermal receptors located?

Answer 20

in subcutaneous tissue all over the body

Question 21

Where are muscle spindles found?

Answer 21

• most skeletal muscle
• posture muscles
• extraocular muscles
• intrinsic muscles of the hand

Question 22

Muscle spindles send info about

Answer 22

• if length is changing

- how quickly

Question 23

Where is the golgi tendon organ located?

Answer 23

tendons of most skeletal muscle

Question 24

Anterior spinothalamic sensations and destination

Answer 24

• pressure, texture, light touch, stretching of skin

- sensory cortex (contralateral side)

Question 25

Lateral spinothalamic sensations and destination

Answer 25

• pain, temperature

- sensory cortex (contralateral side)

Question 26

Dorsal columns sensations and destination

Answer 26

• vibration, 2 point discrimination, conscious proprioception
• sensory cortex (contralateral side)

Question 27

Spinocerebellar sensation and destination

Answer 27

• unconscious proprioception

- cerebellum

Question 28

C fibers

Answer 28

• small, unmyelinated
• slow, dull, aching
• long lasting

Question 29

A delta fibers

Answer 29

• small myelinated
• quck but short
• sharp, stabbing, pricking