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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Assessing segmental versus non-segmental features in the ventral nervous system of onychophorans (velvet worms)

Fig. 1

General anatomy and organisation of the central nervous system in Onychophora. Walking specimens of Principapillatus hitoyensis (a) and Euperipatoides rowelli (b). c Simplified diagram showing the entire onychophoran central nervous system with the brain situated within the head and the two ventral nerve cords located in the trunk. d Dissected single nerve cord from a specimen of P. hitoyensis. Anterior is up. Note the slight swelling in each leg-bearing region (dotted brackets). an, antenna; at, antennal tract; br, brain; le, leg; ln, leg nerve; nc, nerve cord; mc, median commissure; rc, ring commissure; sp, position of slime papilla. Scale bar: 50 μm (d)

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