part of adult circulatory system adult hemocoel FBbt:00003150 Hemocoel of the adult. It is not divided into dorsal, perivisceral and ventral sinuses as in other insects. However, the hemocoel of each leg is divided into dorsal and ventral sinuses by a delicate membrane that extends across the leg and that bears the leg trachea. adult haemocoel fly_anatomy.ontology hemocoel