Dorsal Column- Medial Lemniscus Pathway

Front 1

1. What sensations are carried by the dorsal column - medial lemniscus pathway?
2. What do almost all sensory pathways do?

Back 1

1. Fine touch, vibation, proprioception and pressure
2. cross the midline then go through the thalamus then on to the cerebral cortex (primarily post central gyrus aka somatosensory gyrus)

Front 2

1. Term for the orderly fashion in which fibers are added to sensory pathways that correlates with the part of the body they came from
2. Term for a loss of sensation on the opposite side
3. Term for a loss of sensation from the same sie

Back 2

1. Somatotopic organization
2. Contralateral
3. Ipsilateral

Front 3

Commonalities in pathways
1. How many neuron chains are the sensory pathways made of?
2. Are 1st order neurons on the ipsi or contralateral side
3. 2nd neurons on ipsi or contralateral side, terminate where?
4. 3rd order neurons begin and terminate where?

Back 3

1. 3
2. Ipsilateral
3. Contralateral- thalamus
4. Begin in thalamus and terminate in the post-central gyrus aka somatosensory gyrus aka Brodman's areas 3, 1, 2

Front 4

1. Where does the dorsal column - medial lemniscus pathway cross?
2. Name for the bundle of fibers that cross midline?

Back 4

1. In the caudal medulla
2. Medial lemniscus

Front 5

1. What is a main disease that demyelinates the dorsal column? (sensations lost?)
2. Sensation below C6 travels up what bundle of fibers? (2ndary nerve is where?)
3. Sensation between C2-C6 travels up what bundle of fibers? (2ndary n. is where?)DORSAL COLUMN – MEDIAL LEMNISCUS PATHWAY

Back 5

1. Syphilis (Fine touch, pressure, proprioception, vibration)
2. Fasciculus gracilis (synapses on nucleus gracilis)
3. Fasciculus cuneatus- lateral to gracilis (synapses on nucleus cuneatus- lateral to nucleus gracilis)

Front 6

1. Fasciculus is another name for what?
2. Why is the dorsal column - medial lemniscus pathway C2 and below and does not include C1?
3. Where does this pathway cross at?
4. What is the highest sensory for this pathway?

Back 6

1. a nerve tract
2. C1 is motor only
3. Medial lemniscus
4. posterior 1/3 of the head via the greater and lesser occipital

Front 7

1. What a. supplies the post central gyrus?
What should you add to the vertebral level to get the spinal cord level in the:
1. Cervical vertebra
2. Thoracic vertebra
3. Low thoracic

Back 7

1. Anterior cerebral a.
2. Add about 1
3. about 2
4. About 3

so spinal segment at the T8 vertebral level is for T10... fracture at T8 causes Sx in T10 dermatome

Front 8

1. What is the combined name for the fasciculi cuneatus and gracilis? DORSAL COLUMN – MEDIAL LEMNISCUS PATHWAY
Give the location of the cell body and where fibers terminate for the:
2. First order neuron
3. 2nd order
4. Third order

Back 8

1. Dorsal columns of spinal cord
2. Body (DRG), Term (nucleus gracilis or cuneatus)
3. Body (nucleus gracilis/cuneatus), Term (ventral posterolateral nucleus VPL of thalamus)
4. Body (VPL), Term (post central gyrus)

Front 9

1. What do the 3rd order neurons travel through on their way to the post central gyrus? DORSAL COLUMN – MEDIAL LEMNISCUS PATHWAY

Back 9

1. leave the VPL, travel through the posterior limp of internal capsule, ascend through the corona radiata