Pathways in the spinal cord and brainstem

Question 1

what modality is the medium lemniscal pathway

Answer 1

light touch and vibrational sense

Question 2

in the dorsal column pathway for the lower limb where does the 1st order neuron axon run and where is its synapse

Answer 2

runs in the gracile fasciculus at the back of the spinal cord, most medial fasciculus, and then synapses to the 2nd order at the Gracile nucleus

Question 3

describe the path of the 2nd order neuron in the dorsal column pathway for lower limb

Answer 3

cell body gracile nucleus, crosses over going into the medial lemniscus through the medulla, runs in this space until the VPL of the internal capsule

Question 4

what level are the gracile and cuneate nuclei located

Answer 4

in the medulla more so the caudal part

Question 5

describe the path of the 1st order neuron in the dorsal column pathway for the upper limb

Answer 5

DRG cell body
axon up the cuneate fasciculus
synapse in the cuneate nucleus

Question 6

describe the path of the second order neuron in the dorsal column pathway

Answer 6

cell body is in the cuneate nucleus in the medulla, cross over in the medulla to other side, running up the medial lemniscus

Question 7

describe the path of the spinothalamic first order neuron

Answer 7

DRG cell body, then coming in immediately and synapsing in the dorsal horn

Question 8

describe the path of the second order neuron of the spinothalamic pathway

Answer 8

the synapse is in the dorsal horn of the spinal cord, the axon then runs and crosses over via the ventral white commisure then runs up the lateral spinothalamic tract to the VPL

Question 9

what is the modality of the spinothalamic pathway

Answer 9

pain and temperature sensation

Question 10

whats the modality of the cuneocerebellar tract

Answer 10

upper limb proprioception

Question 11

how many neurons in the cuneocerebellar tract and the posterior spinocerebellar tract

Answer 11

2
-“2?” in a rich texan voice

Question 12

what levels of the spinal cord are the first order neurons for the cuneocerebellar tract

Answer 12

superior to C8

Question 13

whats the nucleus which the first order neuron of the cuneocerebellar tract synapses in

Answer 13

the lateral cuneate nucleus in the medulla

Question 14

what is the nucleus called where the first order neuron of the posterior spinocerebellar tract synapses

Answer 14

Clarkes Nucleus in the thoracic and lumbar spinal cord segments

Question 15

where is clarkes nucleus

Answer 15

in the thoracic and lumbar spinal cord segments.
this is for the posterior spinocerebellar pathway remember

Question 16

describe the path of the 1st order neuron in the cuneocerebellar tract

Answer 16

cell body is in the DRG superior to C8, axon then ascends ipsilaterally in cuneate fasciculus until synapsing in the lateral cuneate nucleus

Question 17

describe the path of the 2nd order neuron in the cuneocerebellar tract

Answer 17

cell body in the lateral cuneate nucleus, axon of this then ascends up the cuneocerebellar tract and into the cerebellum via the ICP.

Question 18

what can the lateral cuneate nucleus also be called

Answer 18

the accessory cuneate nucleus

Question 19

whats the sensory modality of the posterior spinocerebellar tract

Answer 19

proprioception for the lower limb at or below the level of C8

Question 20

describe the path for the first order neuron in the posterior spinocerebellar tract

Answer 20

cell body is in the DRG at or below the level of C8 to L2 ish, once axon comes into the spinal cord it immediately synapses onto 2nd order neuron in clarkes nucleus

Question 21

whats the path of the 2nd order neuron in the posterior spinocerebellar tract

Answer 21

cell body in clarkes nucleus (in the spinal cord), it ascends in the posterior spinocerebellar tract and into the cerebellum via the ICP