Sensory Systems and Associated Structures

Question 1

what three pathways carry sensory information to the brain

Answer 1

dorsal column pathway
spinothalamic pathway
spinocerebellar pathway

Question 2

what are the 7 sensory modalities

Answer 2

special senses
discriminative touch
proprioception
pain
temperature
pressure
non discriminative touch

Question 3

what sensory modality would help you determine the texture of something you touch

Answer 3

discriminative touch

Question 4

where does sensory information first split from being entangled with motor information

Answer 4

dorsal and ventral roots to spinal cord
(spinal nerves are mixed)

Question 5

where are the cell bodies of sensory neurons found

Answer 5

dorsal root ganglion which is found between the mixed spinal nerve and dorsal horn

Question 6

where is the dorsal column pathway found

Answer 6

big section in behind dorsal horn (look up diagram)

Question 7

where is spinocerebellar tract found

Answer 7

thin strip round lateral rim of spinal cord

Question 8

where is spinothalamic tract found

Answer 8

thin strip ventral to ventral horn

Question 9

what information does the dorsal column pathway carry

Answer 9

discriminative touch and proprioception

Question 10

what does gracilis refer to

Answer 10

lower body/limb

Question 11

does cuneatus refer to

Answer 11

upper body/limb

Question 12

what are the two parts of the dorsal column and which is more medial

Answer 12

fasiculus gracilis - more medial (info from lower body so enters first and gets ‘pushed in’ by info from upper body - cuneatus)
fasiculus cuneatus - more lateral

Question 13

how many neurons make up the dorsal column

Answer 13

3

Question 14

learn and draw pathways

Question 15

where are the second order cell bodies found in the dorsal column pathway

Answer 15

caudal medulla
in the nucleus gracillis and nucleus cuneatus

Question 16

where is the medial lemniscus found

Answer 16

brain stem

Question 17

what are the three parts of the internal capsule

Answer 17

anterior limb
genu - bend
posterior limb

Question 18

where is the thalamus found in relation to the internal capsule

Answer 18

medial to posterior limb

Question 19

what is found lateral to the genu of the internal capsule

Answer 19

lentiform nucleus

Question 20

what is found medial to the anterior limb of the internal capsule

Answer 20

caudate nucleus

Question 21

what information is carried in the spinothalamic pathway

Answer 21

pain
non-discriminative touch
temperature

Question 22

where is the ventral white commissure found

Answer 22

in spinal cord
ventral
white matter connection between two halfs of spinal cord

Question 23

where is spinal lemniscus found

Answer 23

brain stem

Question 24

where does the dorsal column pathway and spinothalamic pathway enter the thalamus

Answer 24

VPL nucleus

Question 25

where does the spinocerebellar pathway enter the thalamus

Answer 25

VPM nucleus

Question 26

what information is carried in the spinocerebellar pathway

Answer 26

proprioception

Question 27

where does the spinocerebellar pathway end

Answer 27

cerebellum

Question 28

how many neurons form the spinocerebellar pathway

Answer 28

2

Question 29

what are the two types of spinocerebellar pathway

Answer 29

dorsal and ventral

Question 30

what’s the difference between the dorsal and ventral spinocerebellar pathways

Answer 30

dorsal doesn’t decussates
ventral decussates and then crosses back again
both have same function

Question 31

what nerve carries general sensation for the head and neck

Answer 31

trigeminal - CN5

Question 32

where do the different sensory modalities of general sensation from the head and neck segregate

Answer 32

in the brain stem
they are all carried together to there by the trigeminal nerve

Question 33

which nerve supplies the skin covering the belly button

Answer 33

T10

Question 34

which nerve supplies the skin covering the thumb

Answer 34

C6

Question 35

which nerve supplies the skin covering the middle finger

Answer 35

C7

Question 36

which nerve supplies the skin covering the pinkie

Answer 36

C8

Question 37

which nerve supplies the skin covering the kneecap

Answer 37

L4

Question 38

which nerve supplies the skin covering the nipple in males

Answer 38

T4

Question 39

where can diaphragm pain be referred to

Answer 39

shoulder