The inability to perceive the texture & shape an object occurs in lesion of.
Lateral spino-thalamic tract
Nucleus gracils
Spino reticular tract
Nucleus cuneatus
D. i.e. Nucleus cuneatus The middle pa of cuneate nucleus, the pars rotunds which receives impulses from digits, palm, dorsum of hand & forearm is specific for stereognosis.- Stereognosis is determination of texture & size of an object, is a function of cerebral coexThe sensory information of stereognosis to brain is carried by posterior column which includes tractus gracilis & tractus cuneatus Tractus gracilis bring sensation from lumber & sucral segments to nucleus gracilis (less specific for steriognosis)- Tractus cuneatus bring sensation from cervical & thoracic segments to nucleus cuneatus.Mnemonic - "Gracilis for lower segments & Cuneatus for upper segments - G comes after C