Pain

Question 1

What is the posterior ascending/ sensory sytem

Answer 1

Dorsal column lemniscus

Question 2

What receptors are in the DCL

Answer 2

Mechano

Proprio

Question 3

what DCL fasicle receives sensation from below t6

Answer 3

Gracilis fasicle/ medial

Question 4

Which DCL fasicle receives sensation from above t6

Answer 4

Cuneate fasicle/ lateral

Question 5

Is there a decussation in the DCL tract? Where is it?

Answer 5

Decussation in medulla, where it also synapses on 2nd order neurons

Question 6

List the synapses and neurons in the DCL tract

Answer 6

1st neuron: body/spinal root –> up posterior SC
1st synapse: lower medulla (nucleus gracilis and nucleus cuneatus)
2nd neuron: decussates to contralateral medulla and ascends
2nd synapse: thalamus VPL
3rd neuron: thalamus –> cortex
3rd synapse: primary somatosensory
4th neuron: primary somatosensory cortex

Question 7

What is the function of the spinocerebellar tract

Answer 7

Coordination of muscles in the trunk and limbs

Thus, unconscious propriooceptive sensations

Question 8

How many order neurons does the spinocerebellar tract have

Answer 8

3

Question 9

List the synapses and neurons in the spinocerebellar tract

Answer 9

1st neuron: body –> sc grey matter
1st synapse: SC grey matter
2nd neuron: sc grey matter –> up spinocerebellar tract to cerebellus
2nd synapse: Ipsilateral cerebellar cortex
3rd neuron: to superior and inferior cerebellar peduncle