Figure 4From: A revision of brain composition in Onychophora (velvet worms) suggests that the tritocerebrum evolved in arthropodsPosition of neuronal cell bodies innervating segmental cephalic appendages in the onychophoran Euperipatoides rowelli. Differential staining by retrograde fills with dextran. Confocal projections. Scale bars: 50 μm. (A) Antennal nerve (an) filled with dextran-tetramethylrhodamine. Note the antero-median position of neuronal cell bodies (arrow) within the protocerebral brain region. Anterior is in the upper right corner. (B) Partial projection of the same stack as in A showing that some filled axons of the antennal nerve terminate in the antennal glomeruli (ag). (C) Detail of a jaw nerve (jn) filled with dextran-tetramethylrhodamine. (D) Detail of slime papilla nerves (sn) filled with dextran-fluorescein. Arrowheads indicate the position of neuronal cell bodies in C and D. Abbreviations: ag, antennal glomeruli; an, antennal nerve; ey, eye; jn, jaw nerve; nc, nerve cord; sn, slime papilla nerves.Back to article page