sensory systems 1

Question 1

ascending pathways

Answer 1

trunk and extremeties
info from receptors 
to spinal cord 
ascend through spinal cord 
ascend through brainstem 
to thalamus
to cortex

Question 2

touch gets to cortex from limbs and trunk via

Answer 2

dorsal column/medial lemniscus pathway

Question 3

touch gets to cortex from head via

Answer 3

trigeminal nerve and trigeminalthalamic pathway

Question 4

meissner corpuscle

Answer 4

tactile shapes and surfaces
low frequency vibration, flutter, two point touch
superficial

Question 5

pacinian corpuscle

Answer 5

vibrations
deeper in skin
slowly adapting fibers

Question 6

ruffinis corpuscles

Answer 6

shapes and stretching

joint rotation

Question 7

merkels disks

Answer 7

tactile indentations

edges and shapes

Question 8

free nerve endings

Answer 8

temperature and tissue damage

some touch

Question 9

proprioception ascends from CNS following __ column

Answer 9

dorsal column-medial lemniscus pathway for the trunk and extremeties

Question 10

pain primarily carried by

Answer 10

anterolateral system (ALS), AKA spinothalamic tract.

Question 11

temp pain itch
axons from skin
axons from muscles

Answer 11

C

IV

Question 12

pain, temp
axons from skin
axons from muscles

Answer 12

Adelta

III

Question 13

mechanoreceptors of skin
axons from skin
axons from muscles

Answer 13

Abeta

II

Question 14

properioreceptors of skeletal muscle
axons from skin
axons from muscles

Answer 14

Aalpha

group I

Question 15

____ are the primary afferent neurons that transmit information from peripheral receptors into spinal cord

Answer 15

dorsal root ganglion neurons

Question 16

fasciculus gracilis carries infro from

Answer 16

lower extremities

Question 17

which way do axons ascend in lower and upper limbs

Answer 17

medial and laterally

Question 18

which are are dorsal columns and ascending axons of anterolateral system organized

Answer 18

somatotropically

Question 19

the first order neurons for the PWC/medial lemniscus pathway ascend to the ___

Answer 19

dorsal column nuclei

Question 20

third order neurons project to what via what

Answer 20

primary somesthetic cortex(in postcentral gyrus) via posterior limb of internal capsule

Question 21

where second order neurons synapse on third order neurons

Answer 21

ventral posterior lateral nucleus of thalamus

Question 22

medial lemniscus second order neurons ascend in ___ of the pons and midbrain as they head toward the thalamus

Answer 22

contralateral tegmentum

Question 23

thalamus project to

Answer 23

primary somatic sensory cortex

Question 24

thalamus function

Answer 24

localize stimulation to particular site on body

Question 25

deep mechanoreceptors

Answer 25

joints and muscles
course body representation
limb position and shape detection

Question 26

superficial mechanoreceptors

Answer 26

skin
complete and detailed body representation
texture representation

Question 27

unimodal cortex

Answer 27

initial synaptic relays

encode perceptual character of sensory experience

Question 28

temporal lobe involved in

Answer 28

object recognition

Question 29

posterior parietal cortex involved in

Answer 29

perception of body image

important for integrating all sensory info