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Figure 1


Fig. 1. Scanning electron micrograph in a corrosion cast to show the heart, its two afferent vessels, the latero-lateral (llv) and the larger latero-dorsal (ldv) vessels, and the efferent latero-abdominal vessel (lav, inset). The afferent vessels receive blood from the capillaries of the integument and body wall musculature and are contractile up to their first bifurcation. Inset: removing the capillaries (circle) reveals the latero-abdominal sphincter (arrowhead) and the bifurcation of the efferent latero-abdominal vessel. Just anterior is the heart sphincter of the next anterior heart segment (arrow). Due to the pressure necessary for the resin injection (see text), the valves between the side vessels and the heart (asterisks) are closed, as indicated by the constriction between the two vessels. Some capillary beds were trimmed for viewing purposes. Right body side, anterior to the top. Scale bars, 500 µm.





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