Xenopus spinal cord in schematic view (above) and immunofluorescently

labeled with anti-ß tubulin antibodies (below) showing the primary fascicles

and several distinct neuronal cell types. Rohon-Beard (RB) sensory neurons

form the dorsal fascicile while motoneurons (MNs) and ascending interneurons

(AIs; not seen below) make up the ventral fascicle. Dorsal lateral ascending

(DLA) and commissural interneurons (CIs) are also evident. Image provided

by Timothy Gomez.