Answer :
Decussation on their way to cross over to the opposite side of the body, the axons of some trigeminothalamic pathway neurons synapse with second-order neurons here.
Second-order neurons make up these two nuclei (the dorsal column nuclei). The internal arcuate fibers, which comprise the medial lemniscus on each side, are the name given to their axons as they cross over to the other side of the medulla.
Sensory decussation is the term for this transition. So that they can switch sides, the axons of the neurons in each of these cortexes must bifurcate (split in two) at some point during their descent to the spinal cord.
This decussation or crossing takes place right before At the base of the brain, the nerve conveying the impulse does a U-turn and travels to the opposite side. The spinal cord receives the stimulation. The spinal cord's nerve fibers and a motor nerve share a synapse as the impulse travels there.
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