Somatosensory

Question 1

Definition: taking physical energy and putting it into electrical energy which will eventually cause an action potential

Answer 1

transection

Question 2

What are the types of somatosensory receptors?

Answer 2

capsulated and unencapsulated

Question 3

What are the unencapsulated receptors?

Answer 3

free nerve endings
merkel’s

Question 4

What are free nerve endings responsible for?

Answer 4

pain and temperature

Question 5

What are merkel’s receptors responsible for?

Answer 5

tactile discrimination (ex: braille)

Question 6

What are the capsulated sensory receptors?

Answer 6

• pacinian
• muscle spindles
• GTO
• ruffini corpuscule
• meissner’s corpuscle

Question 7

What are the pacinian sensory receptors responsible for?

Answer 7

vibration and changing stimuli (found in the dermis)

Question 8

What are the ruffini corpuscles responsible for?

Answer 8

picking up the stretching of the skin

Question 9

What are meissner’s corpuscles responsible for?

Answer 9

vibration and a initial contact of a stimuli to the skin

Question 10

definition: the area of skin that stimulates the receptor found underneath the surface

Answer 10

receptive field

Question 11

definition: 2-point discrimination with location of the stimulus… stimulus intensity is greater in the receptor closest to it

Answer 11

inhibitory surround

Question 12

What type of skin has no hairs? Where is it found on the body?

Answer 12

glabrous skin… it is found on the soles of the feet and palms of the hands

Question 13

What are the functions of the dorsal column system/medial lemniscus?

Answer 13

• discriminative/fine touch
• vibration
• joint position

Question 14

What are the functions of the anterolateral system?

Answer 14

• crude touch
• temperature
• pain

Question 15

The anterolateral system contains (small/large)-diameter fibers

Answer 15

small diameter

Question 16

The dorsal column system/medial lemnicus contains (small/large)-diameter fibers.

Answer 16

large diameter

Question 17

How does one calculate the conduction velocity of an afferent fiber?

Answer 17

(fiber diameter) x 6

Question 18

What types of muscle nerves pick up metabolites?

Answer 18

III (smallest myelinated/alpha gamma) and IV (unmyelinated/c fibers)

Question 19

What type of afferent fiber group make up the pain and temperature receptors in the skin?

Answer 19

C fibers (unmyelinated)

Question 20

What areas of the primary somatosensory cortex (s1)
provide cutaneous information?

Answer 20

areas 3b and 1

Question 21

What areas of the primary somatosensory cortex (S1) provide proprioceptive afferents?

Answer 21

areas 3a and 2

Question 22

What area of the cortex is the primary motor cortex?

Answer 22

area 4

Question 23

What does the hippocampus provide?

Answer 23

memory about sensory stimuli

Question 24

What does the amygdala provide?

Answer 24

emotions

Question 25

What areas of the cortex affect the motor and premotor areas when processing sensation from the primary and secondary somatosensory cortex?

Answer 25

Areas 5 and 7