Each segment has a number of sensory ganglial cells that are located in foramen between adjacent vertebrae. These pseudo-unipolar cells have peripheral projections as receptor organs and central projections as roots fibers forming pathways in the cord or else segmental synapses.

• Each segment has a number of sensory ganglial cells that are located in foramen between adjacent vertebrae. These pseudo-unipolar cells have peripheral projections as receptor organs and central projections as roots fibers forming pathways in the cord or else segmental synapses.