Final answer:
The cross section of the spinal lemniscus in the medulla most accurately corresponds to the Medial lemniscus, a component of the dorsal column system responsible for carrying touch and proprioception information and decussating within the medulla.
Step-by-step explanation:
The question is asking about the cross section of the spinal lemniscus in the medulla. The correct answer to the question is the Medial lemniscus. The Medial lemniscus is part of the dorsal column system, which carries information about touch and proprioception, and it crosses the midline in the medulla. This system begins with the axon of a dorsal root ganglion neuron entering the dorsal root and joining the dorsal column white matter in the spinal cord. It then forms two distinct component tracts: the fasciculus gracilis, carrying axons from the legs and lower body, and the fasciculus cuneatus, carrying axons from the upper body and arms. On the other hand, the Spinothalamic tract carries pain and temperature sensation and decussates at the level of the spinal cord. The Corticospinal tract is mainly responsible for control over different domains of the musculature and decussates at the pyramidal decussation at the junction of the medulla and the spinal cord.