nucleus gracilis

They are caused by masses of gray matter known as the nucleus gracilis and the nucleus cuneatus.

VPC receives axons from the dorsal column nuclei located in the lower medulla oblongata: the nucleus gracilis (Goll) medial and the nucleus cuneatus (Burdach) lateral.

Once the fasciculus gracilis reaches the nucleus gracilis and the fasciculus cuneatus reaches the nucleus cuneatus in the lower medulla, they begin to cross over the medulla as the internal arcuate fibers.

Either way, the primary axon ascends to the lower medulla, where it leaves its fasiculus and synapses with a secondary neuron in one of the dorsal column nuclei: either the nucleus gracilis or the nucleus cuneatus, depending on the pathway it took.