The word haemocoel is formed from the Greek words haema meaning blood and coel meaning cavity. A body cavity filled with hemolymph is called a hemocele. Their hemocele is called myxocele. It is divided into three chambers or sinuses by the dorsal membrane and digital membrane. These are-
(i) Pericardial sinus: It is located above the dorsal membrane. It contains the heart.
(ii) Perivisceral sinus: It is located below the dorsal membrane. The alimentary canal is located in it. Dr. Siddiq Publications
(iii) Perineural sinuses: It is located under the digital membrane. It contains nerve fibers.