Somatosensory Pathways

Question 1

Lesion on 1st order neuron

Answer 1

same side deficit

Question 2

Lesion on 3rd order neuron

Answer 2

contralateral deficit

Question 3

Only sensory pathway that does not go through thalamus

Answer 3

Olfactory

Question 4

Posterior column-medial lemniscus (DCML) carry

Answer 4

proprioception, vibration, fine touch, and stereognosis

Question 5

Where does the DCML pathway cross?

Answer 5

at medulla

Question 6

T7 and below DCML pass through what posterior column?

Answer 6

Fasiculus gracilis

Question 7

T6 and above DCML pass through what column?

Answer 7

Fasiculus cuneatus

Question 8

ALS is how many pathways?

Answer 8

2- anterior spinothalamic & lateral spinothalamic

Question 9

Where do the ASL pathways cross?

Answer 9

in the spinal cord

Question 10

Lissauer’s tract is applicable to what pathways?

Answer 10

ASL

Question 11

What are Lissauer’s tract?

Answer 11

asl pathway that travels to its corresponding spinal level and then up 2 levels as collateral branches, in case of injury can still have sensory in that spot

Question 12

Somatosensory information goes through what part of thalamus?

Answer 12

VPL and VPM- ventral posterior lateral/medial

Question 13

How many spinocerebellar tracts are there?

Answer 13

2- anterior and posterior

Question 14

Which spinocerebellar tract crosses?

Answer 14

Anterior- crosses twice to stay on same side of cerebellum via superior peduncle

Question 15

Posterior spinocerebellar tract passes through …

Answer 15

inferior peduncle- never crossing and going straight up and on same side to cerebellum

Question 16

Information moved with spinocerebellar tracts

Answer 16

proprioceptive info of muscles, tendons, and joints