Fine structure of the abdominal neurosecretory organs of Rhodnius prolixus Stål.

Abstract
Abdominal segments II–V of female Rhodnius prolixus adults each contain a pair of abdominal neurosecretory organs (ANO). They are attached to the anterolateral borders of their respective tergites and sternites. The ANO consist of neurosecretory neurons containing granules approximately 120 nm in diameter, together with glial and connective tissue elements. Apparent neurohaemal areas are located dorsally.