POSTERIOR COLUMNS

Question 1

What are the two major components of the PCML system

Answer 1

Fasciculus Cuneatus

Fasciculus Gracilis

Question 2

What does PCML stand for

Answer 2

Posterior column-medial lemniscus

Question 3

What information does the PCML transmit

Answer 3

• Discriminative touch
• Pressure
• Vibration
• Proprioception

Question 4

What artery is responsible for blood supply to the PCML

Answer 4

posterior spinal artery

Question 5

Axons of the PCML enter the spinal cord from the spinal ganglion and pass directly to the ipsilateral posterior column. what occurs here

Answer 5

rostral fibres (above T6) enter fasciculus cuneatus to ascend and caudal fibres (below T6) enter fasciculus gracilis (medial) to ascend

Question 6

Int he rostral medulla the fibres of the PCML travel as the…

Answer 6

Medial lemniscus

Question 7

Where does the medial lemniscus terminate

Answer 7

in the VPL of the thalamus

Question 8

The final location of the PCML following the thalamus is the

Answer 8

somatosensory cortex