4 ascending and descending tracts

Question 1

What separates the somatic sensory brain and motor sensory brain/

Answer 1

the central sulcus

Question 2

What sorts of sensory information do the dorsal columns carry?

Answer 2

low-threshold signals

proprioception and tactility

Question 3

What sorts of sensory information do the ventral spinocerebrellar tracts carry?

Answer 3

pain and temperature

Question 4

Where is concious sensation processed?

How does it get there?

Answer 4

sensory cortex

dorsal columns and spinothalamic tract

Question 5

Where is non-concious sensation processed?

Answer 5

cerebellum

Question 6

What facilitates division of the primary sensory neurone to synapse in its’ respective, superior, and inferior dorsal horns?

Answer 6

posterolateral tract of Lissauer

Question 7

What is significant about the lamina in which the primary sensory neurone terminates?

Answer 7

determined by the modality it represents

Question 8

Which laminae do pain fibres terminate in?

Answer 8

Laminae I and II of the dorsal horn

Question 9

What are Laminae III and IV otherwise called?

Answer 9

Nucleus Proprius

Question 10

What are decussation fibres otherwise known as?

Answer 10

anterior commissures

spinal arcuate fibres

Question 11

What happens to nerve fibres once they decussate?

Answer 11

they travel in the white matter of the contralateral side

Question 12

What happens in the 3rd stage of spinal sensation?

Answer 12

axons of 3rd order sensory neurons of the VPL ascend further to terminate in the post-central gyrus via the internal capsule

Question 13

At which level do fibres of the ventral spinocerebrelllar tract decussate?

Answer 13

same neural level as its’ respective dermatome

Question 14

At which level do fibres of the dorsal column decussate?

Answer 14

medulla

Question 15

What is syringomyelia?

Answer 15

a cyst of hte spinal canal caused by spinal irritation

Question 16

What happens if a syringomyelia grows inferiorly?

Answer 16

bilateral loss of sensation (in fingers a lot)

Question 17

What are the characteristics of Bernard Sequard syndrome?

Answer 17

hemiparaplegia

hemianesthesia

Question 18

Where does the non-pyramidal system originate?

Answer 18

brainstem / basal ganglia

Question 19

Where does the pyramidal system originate?

Answer 19

precentral gyrus

Question 20

What is the pathway of the non-pyramidal system?

Answer 20

cerebral cortex
thalamus
basal ganglia
spinal cord (ventral horn)

Question 21

What are the types of tracts associated with the non-pyramidal system?

Answer 21

rubrospinal
pontine reticulospinal
medullary reticulospinal
lateral vestibulospinal
tectospinal

Question 22

What are the 2 main types of pyramidal or cortical tracts?

Answer 22

corticospinal tract

corticobulbar tract

Question 23

What does the corticospinal tract connect with?

Answer 23

connects with LMN of skeletal muscle

Question 24

What does the corticobulbar tract connect with?

Answer 24

connects to the motor nuclei of the cranial nerve