Fig. 2
Anatomy of the anterior nervous system in the onychophoran Euperipatoides rowelli. Light micrograph (a) and simplified diagram (b) of dissected brain and anterior nerve cords in ventral view. Anterior is up. Anteriormost post-oral commissures numbered (#1 to #5). at antennal tract, cc connecting cord (characterized by the absence of ring commissures), dc deutocerebrum, ey eye, ho hypocerebral organ, jn jaw nerve, L2 and L3 second and third lip papillae nerves; mc, median commissure, nc nerve cord, pc protocerebrum, pn1 and pn2 anterior and posterior pharyngeal nerves, rc ring commissure, sn slime papilla nerves. Scale bar (in a) 200 µm