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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060

Mem. Inst. Oswaldo Cruz vol.86 no.1 Rio de Janeiro Jan./Mar. 1991 

Scanning electron microscopy of the dorsal vessel of Panstrongylus megistus (Burmeister, 1835) (Hemiptera: Reduviidae)

Nadir Francisca Sant'Anna Nogueira1 

Wanderley de Souza1 

Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Departamento de Parasitologia e Biofísica Celular, Rio de Janeiro, Brasil


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 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 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.

Key words: dorsal vessel; scanning electron microscopy; Panstrongylus megistus; Hemiptera; Reduviidae


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