Answer
The dorsal columns in L4 to S1.
In this case posterior columns of the lower (lumbar) region of the spinal cord (SC) have been injured. The function of the posterior columns is to convey impulses of touch and proprioception (awareness of spatial positions) as well as sensations of light pressure and vibration sensations
Work Step by Step
A person with medial lemniscal pathway injury will suffer loss of balance (Romberg sign), will fail a two point test, will not recognise skin writing when blindfolded (graphesthesia) and will lose sensitivity to touch.
Region of spinal cord usually affected L4, L5, S1.
