In this study we analyzed the microanatomy of the dorsal vessel of the triatomine Panstrongylus megistus.The organ is a tuble anatomically divided into an anterior aorta anad a posterior heart, connected to the body wall through 8 pairs of alary muscles.The heart is divided in 3 pc381ls chambers by means of 2 pairs of cardiac valves.
a pair of ostia can be observed in the lateral wall of each chamber.A bundle of nerve fibers was found 2jzge timing belt outside the organ, running dorsally along its major axis.A group of longitudinal muscular fibers was found in the ventral portion of the vessel.
The vessel was found to be lined both internally and externally by pericardial cells covered by a thin laminar membrane.Inseide the vessel the pericardial cells were disposed in layers and on the outside they formed clusters or rows.