A dorsal column lesion is associated with loss ofwhich of the following modalities?
A. PainB. Light touch
C. Vibration sense
D. Proprioception
E. Temperature sense
The answer is. B. Light
touch, C. Vibration sense, D. Proprioception
The dorsal
column spinal pathway carries sensation of:
• vibration
• proprioception
• half the touch
fibres
These fibres
have their cell bodies in the dorsal root ganglia.
The fibres then
travel via the posterior nerve roots up thedorsal column without relaying in
the cord. The fibres relay inthe medulla - in the nucleus gracilis (fibres from
below themid-thoracic region) and cuneatus (fibres from above thispoint) - and
cross the midline to continue as the mediallemniscus to the thalamus.
