MIDTERM II

Question 1

Senses external stimuli applied to the skin

Answer 1

Exteroreceptive system

Question 2

Stimuli that are sensed by the exteroreceptive system

Answer 2

Mechanical (touch)
Thermal (temperature)
Nociceptive (pain)

Question 3

Monitors position of the body (body awareness)

Answer 3

Proprioceptive system

Question 4

Senses general info like temperature and blood pressure

Answer 4

Interoceptive system

Question 5

Simplest and multimodal receptors

Answer 5

Free nerve endings

Question 6

Mechanoreceptors which sense sudden skin displacements and adapt rapidly and respond immediately

Answer 6

Pacinian corpuscles

Question 7

Mechanoreceptor which adapts slowly to gradual skin indention

Answer 7

Merkels disks

Question 8

Mechanoreceptor which adapts slowly to gradual skin stretch

Answer 8

Ruffini ending

Question 9

Area of the body that is innervated by left and right dorsal roots of a given segment of spinal cord

Answer 9

Dermatomes

Question 10

2 major somatosensory pathway

Answer 10

1) haptic-proprioception (touch, body awareness)

2) pain

Question 11

Receive an relay pain touch and proprioception info to the primary somatosensory cortex; also receive input from 3 branches of trigeminal nerve

Answer 11

Ventral posterior thalamus

Question 12

Tract in the pain pathway which projects to the ventral posterior thalamus, similar to dorsal column medial lemniscus system

Answer 12

Spinothalamic tract

Question 13

Projects to reticular formation

Answer 13

Spinoreticular tract

Question 14

Effects of lesions on ventral posterior thalamus

Answer 14

Loss of sensation of touch, sharp pain and temperature cutaneously

Question 15

Effects of lesion on intralaminar and parafiscular nuclei of thalamus

Answer 15

Reduce deep chronic pain

Question 16

Areas/parts of the body with finest tactile determination (densely packeded with touch receptors)

Answer 16

Hands and mouth

Question 17

Can respond to activation of 2 different sensory systems (vision and touch)

Answer 17

Bimodal neurons

Question 18

Inability to recognize objects by touch

Answer 18

Asterognosia

Question 19

Failure to recognize one’s own body parts; usually unilateral

Answer 19

Asomatognosia

Question 20

Likely involved in emotional reaction to pain rather than pain stimuli itself

Answer 20

Anterior congulate cortex

Question 21

Ability of cognitive and emotional factors to suppress pain

Answer 21

Gate control theory of pain

Question 22

Contains specialized opiate receptors which when stimulated, patients feel no pain

Answer 22

Parieaqueductal gray (PAG)

Question 23

Severe chronic pain in the absence of painful stimuli which usually develops after injury; pain medication is not effective

Answer 23

Neuropathic pain