Dorsal Column Medial Lemniscus

Question 1

The pathway that lets you feel things

Answer 1

Dorsal Column/medial lemniscus

Question 2

identifying object based on shape/texture

Answer 2

Sterognosis

Question 3

drawing of number/letter on palm and all receptors are involved

Answer 3

graphesthesia

Question 4

Trasmists sensation of light touch, pressure, vibration, proprioceptoin

Answer 4

Dorsal column/medial lemniscus

Question 5

1st neuron of DC/ML is in

Answer 5

sensory ganglion w/ cell body in DRG

Question 6

2nd neouron of DC/ML is in

Answer 6

sp cd or brainstem– will cross midline here and asencnd to thalamus

Question 7

where does the DC/ML cross the midline

Answer 7

in the caudal medella

Question 8

location of 3rd neuron in DC/ML

Answer 8

thalamus

Question 9

Function of first neuron

Answer 9

peripheral process trasmits info from mechano–> Cell body in DRG

Question 10

When central process leave DRG is ascends _______ with the dorsal columns

Answer 10

IPSILATERALLY

Question 11

Where does the 1st neuron end?

Answer 11

terminates in dorsal column nuclie

Question 12

2nd neuron cell body located

Answer 12

nucleas gracilic or nucleus cuneatus

Question 13

Where does axon decussation occur for DC/ML

Answer 13

goes to contralateral side after synapsing on F.gracilis or cuneatus

Question 14

After decussation on Fgracilis or F. cuneatous, axon ascends….

Answer 14

as the Medial Lemniscus

Question 15

Level of brain the 2nd neuron axon synapses at

Answer 15

cuadal medulla on the F. cuneatus or F. Gracilis

Question 16

F.Gracilis if for

Answer 16

pahtways form lower body

Question 17

F. Cuneatus is for

Answer 17

pathways from upper body

Question 18

Where does the 2nd neuron terminate

Answer 18

In the Ventral posterior lateral nucleus or VPL in the thalamus

Question 19

where is the VPL located

Answer 19

thalamus

Question 20

Where is the cell body of 3rd neuron

Answer 20

Cell body in the VPL of thalamus

Question 21

Where do the axons pass through after then synapse on VPL

Answer 21

axons pass through posterior limb of internal capsule

Question 22

Where does the 3rd neuron terminate

Answer 22

in the SI cortex (poscentral gyrus, primary somatosensory cortex

Question 23

a cluster of NCB with lots of dif nuclei with lots of dif names

Answer 23

thalamus

Question 24

Dorsal colum with axons below T7

Answer 24

fasiculus gracilis

Question 25

Dorsal column with axons above T7

Answer 25

F. cuneatus

Question 26

What gets added on latter, F. gracilis or cuneatus

Answer 26

F. cuneatus bc has from upper body

Question 27

1st neuron: from sp cd to caudal medulla, where are the sacral dermatomes located

Answer 27

medially

Question 28

lumbar, thoracic, cerical dermatomes are located progressively more ______ as we ascend from sp cd to caudal medulla

Answer 28

laterally

Question 29

CC: unilateral sp cd lesion causes loss of what functions

Answer 29

light touch, pressure, vibration and proprioception on SAME SIDE of lesion from derms below level of lesion as well as loss of other seosry and motor fnx

Question 30

lesion here results in loss of lt, pressure, vb from derms below level of lesion on same side as well as loss of other sensory and motor function

Answer 30

unilateral (one side) spinal cord lesion

Question 31

lesion on the left side of spinal cord in sacral region results in

Answer 31

loss of all touch, sensation, vibration and proproception and motor function on SAME SIDE of lesion

Question 32

Bilateral sp cd lesion results in

Answer 32

loss of lt, pressure, vb from dermatomes just below level of lesion and loss of other sensory and motor

Question 33

loss of light touch, pressure, vibration and proprioception from derms below level of lesion while other sensory and motor funx intact

Answer 33

Posterior cord syndome

Question 34

Posterior cord sydrome results in:

Answer 34

loss of lt touch, pressure, vibration from derms below lesion while other sensory and motor functions are intact.

Question 35

loss of lt, pressure, vb from dermatomes just below level of lesion and loss of other sensory and motor (on both sides)

Answer 35

bilateral cord lesion or transecion

Question 36

Large central cord syndrome

Answer 36

a. loss of light touch/pressure/ vibration/proprioception from derms below level of lesion b. Sacral region may be spared because these guys head more lateral higher up we get c. loss of sensory and motor fnx

Question 37

a. loss of light touch/pressure/ vibration/proprioception from derms below level of lesion b. Sacral region may be spared because these guys head more lateral higher up we get c. loss of sensory and motor fnx

Answer 37

Large central cord syndrome

Question 38

get sparing of sacral region, everything else below lesion is fucked

Answer 38

Large central cord syndrome

Question 39

cell bodies in caudal medulla: F. gracilis or F. cunateus

Answer 39

2nd neuron

Question 40

Axons decussate here as interal arcuate fibers

Answer 40

2nd neuron

Question 41

After 2nd neurons decussate, they from axons called

Answer 41

medial lemniscus

Question 42

Axons of medial lemniscus travel from ______ through these regions

Answer 42

caudal medulla | rostral medulla, pons and midbrain

Question 43

Where does the medial lemniscus terminate in

Answer 43

VPL

Question 44

At rostroal medullas, somatotopy

Answer 44

headless hemiman standing on pyramids

Question 45

At level of pons, somatotopy

Answer 45

fibers from face added via trigeminal | and from lateral--center: SLTC

Question 46

At the rostral medulla, what happens to sacral fibers

Answer 46

become more ventral

Question 47

When can we add somatotopy of head

Answer 47

midpons or above

Question 48

Lesion of Medial Lemniscus results in:

Answer 48

loss of lt touch/pressure/vibration from dermatomes BELOW level and on CONTRALATERAL side

Question 49

loss of lt touch/pressure/vibration from dermatomes BELOW level and on CONTRALATERAL side

Answer 49

Lesion of Medial Lemniscus or Medial medullary syndrome

Question 50

Thalamas has VPL: for sensations from VPM for sensations from

Answer 50

body | face

Question 51

Somatotopy of Thalamus

Answer 51

add fibers from face in VPM anlong with VPL | face more medial==> legs more lateral in the thalamus

Question 52

Where do the axons of the third neuron pass through

Answer 52

posterior limb of internal capsule

Question 53

Axons from thalamus fan out in something called

Answer 53

corona radiata

Question 54

Fibers from VPL and VPM head to

Answer 54

SI cortex

Question 55

SI cortex somatotopy

Answer 55

think about face being big and outside laterally, while toward the central sulcus we have the legs and arms

Question 56

Lesion of thalamus or SI cortex result in

Answer 56

loss of sensation from contralateral half of body

Question 57

loss of sensation on right half of face, right half of body d/t

Answer 57

lesion in the contraleral half of thalmus or SI cortex

Question 58

Area 3a for

Answer 58

limb movement

Question 59

Area 3b for

Answer 59

basic tactile info, edges and texture

Question 60

Area 1 for

Answer 60

motion and direction of movment of object

Question 61

Area 2 for

Answer 61

limb position, shape of objects

Question 62

SI neurons project to

Answer 62

SII cortex along upper border of sylvian fissure and insular cortex

Question 63

where is SII cortex at

Answer 63

along upper border of sylvnain fissure and insular cortex

Question 64

Where are Parieatal Association cortices located

Answer 64

intrapariatal sulcus

Question 65

What do parietal association cortices do

Answer 65

recieve senosory info and project it to motor cortex

Question 66

parietal association cortices are both:

Answer 66

unimodal and multimodal

Question 67

lesion in unimodal part of Parietal Association cortices results in

Answer 67

agnosias (cant reconginze an object or property of object

Question 68

Lesion here results in contralateral neglect

Answer 68

in Multimodal part of Parietal Association cortex

Question 69

Region responsible for combining sensation with motivation, attention and relevance

Answer 69

Multimodal part of Parietal association cortex

Question 70

Region for visual, auditory and somatorsensory input from SI or SII

Answer 70

Unimodal Parietal association Cortex