Pinacoderm consists of porocytes cells which bear openings called ostia. The body wall of the sponges consists of two epitheloid layers the outer pinacoderm and the inner choanoderm. Water current plays the most vital role in the physiology of the sponges. Inside the body, the water current flows through a certain system of spaces where by the food is captured from the incoming water and the excretory material is sent out into the outgoing water. The numerous perforations on the body surface of the sponges for ingression and egression of water current are the main constituents of the canal system. The canal system of sponges helps in food acquisition, respiratory gas exchange and also in excretion. Canal system is also known as aquiferous system. The water circulatory system of sponges also called as canal system is the characteristic feature of the phylum Porifera.
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