Enterocoelic pouches

[ Gr. enteron - intestine; Gr. koilos - hollow]. Outpocketings of the archenteron (primitive gut) of the gastrula which form the mesodermal somites later in development. The cavities within the pouches will form the body cavity. Found in animals such as Amphioxus and many echinoderms. Synonym: coelomic sacs.