Lesion of the dorsal column of the spinal cord:
It leads to lesion of Gracil & Cuneate tracts of both sides. This lead to:
1- Loss of fine touch (tactile localization, tactile discrimination, steriognosis and texture of material).
2- Loss of vibration sense.
3- Loss of proprioceptive sensation (sense of position, movement, deep pressure, muscle stretch and tension), this leads to:
o “Sensory ataxia” which means disturbance and incoordination of voluntary movements. The proprioceptive sensations are needed by the cerebellum to coordinate the movements.
 
o “Romberg’s sign”; in this condition the patient losses his equilibrium and falls down if he closes his eyes. After loss of sense of position, the patients depends only on his vision to keep his equilibrium.

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