Fig. 2. Photomicrographs showing wholemount preparations of the crocodile right aorta (A), vena cava (B), aortic anatomosis (C) and dorsal aorta (D) following processing for NADPH-d histochemistry (A,D) and neural NOS IHC (B,C,). A moderate plexus of neural NOS-positive perivascular nerve fibres (arrows) was observed in the outer layers of the wall of each vessel. In addition, some neural NOS-positive perivascular nerve bundles (arrowhead) were observed. Scale bars, 100 µm.