This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Appreciation of shape and size of an object placed in hand is lost in damage of- 
Select and explain. 
A. Tractus cuneatus, B. Tractus gracilis, C. Lateral spinothalamic tract, D. Spinocerebellar tract
A: Tractus cuneatus
Answer: A: Tractus cuneatus 
Explanation: Ans. is 'a' i.e., Tractus cuneatus * Tractus cuneatus is the lateral part of dorsal column pathway (fasciculus cuneatus in spinal cord and nucleus cuneatus in the medulla) which carries tactile senses and proprioception from the upper body (finger, hand). So, its lesion will cause loss of proprioception and tactile senses (two point discrimination, astereognosis/ stereoanaesthesia, fine touch) from the upper body.* Tractus gracilis is the medial part of dorsal column pathway (fasciculus gracilis in spinal cord and nucleus gracilis in medulla) which carries tactile senses and proprioception from the lower body (foot). So, its lesion will cause loss of proprioception and tactile senses from the lower body.