Organisation of the ventral nervous system and alignment of leg nerves in the onychophoran Euperipatoides rowelli . Light micrographs of a dissected specimen with removed digestive and genital tracts. Anterior is up. Arrows point to nephridial ducts. (A) Internal view of ventral body wall showing the position of legs (black dotted circles). (B) Detail of leg nerves (arrowheads) extending into each limb. (C) Detail of nerve cord showing the position of the anterior and posterior leg nerves. Abbreviations: al, anterior leg nerve; br, brain; lo, labyrinth organ (modified nephridium of the fourth leg-bearing segment); mc, median commissure; nc, nerve cord; ph, remnant of the pharynx; pl, posterior leg nerve; sa, salivary gland; sl, slime gland. Scale bars: 500 μm (A), 300 μm (B) and 100 μm (C).