Water enters the spongocoel through hundreds of tiny pores (ostia) and exits through the larger opening (osculum).
Depending on the body plan of the sponge (which can be asconoid, syconoid, or leuconoid), the spongocoel could be a simple interior space of the sponge or a complexly branched inner structure.
The spongocoel is lined by a variety of cell types, each having a unique function:[2]
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