Question

The 2nd-order neuron of the dorsal column-medial lemniscal tract decussates in the caudal medulla. What is the decussation point of the 2nd-order neuron of the dorsal column-medial lemniscal tract?

1) Caudal medulla
2) Rostral medulla
3) Midbrain
4) Spinal cord

Answer 1

The 2nd-order neuron of the dorsal column-medial lemniscal tract decussates at the caudal medulla. This tract is involved in conveying touch and proprioception information to the brain.

Step-by-step explanation:

The decussation point of the 2nd-order neuron of the dorsal column-medial lemniscal tract is in the caudal medulla. After synapsing with the second neuron in either the nucleus gracilis or the nucleus cuneatus, these second-order neurons cross the midline of the medulla, a process known as decussation. This tract is responsible for carrying information about touch and proprioception. It differs from the spinothalamic tract, which carries information about pain and temperature, and decussates at the level of the spinal cord.