Overview of Central Sensory and Motor Pathways

Question 1

Where does the spinal cord exit the brain

Answer 1

Foramen magnum. Extension of the medulla

Question 2

Which part of the CNS is more vascularised

Answer 2

Grey matter as it has more cell bodies

Question 3

Describe C spine

Answer 3

Oval shaped, prominent ventral and dorsal horns reflecting extensive sensory input and motor input to upper limbs.

Question 4

Describe T spine

Answer 4

Lateral horn. Thin grey matter. V. small dorsal and ventral

Question 5

Describe L Spine

Answer 5

Prominent dosal and ventral horns that supply the LL

Question 6

Describe S Spine

Answer 6

Mainly grey matter, round and small

Question 7

What is Somatotrophic Organisation

Answer 7

Densely innervated areas of body occupy larger regions of cortex in brain

Question 8

In the ascending pathway, what is the 1st neurone

Answer 8

From receptor to SC

Synapse in DRG

Question 9

In the ascending pathway, what is the 2nd neurone

Answer 9

Decusates

Synapses in DRG with 1st and thalamus

Question 10

In the ascending pathway, what is the 3rd neurone

Answer 10

From thalamus to primary sensory cortex

Question 11

In the descending pathway, what are the 2 neurone pathways

Answer 11

Upper Motor neurone

Lower Motor neurone

Question 12

Describe path of UMN

Answer 12

Primary motor cortex to SC
Decussates
Synapse on interneurone/ LMN

Question 13

Describe path of LMN

Answer 13

From SC to muscle

From ventral horn

Question 14

Is Ischaemia CNS or PNS

Answer 14

Mostly CNS

Question 15

What does Ischaemia cause

Answer 15

Stroke, Haemorrhage. Cannot move UL