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Definition of Term

spiral valve
(english) A spiral or helical structure in the midgut of Petromyzontiformes, Elasmobranchii, Holocephali and some primitive Teleostomi; a spiral fold of mucous membrane projecting into the intestines. Functions to increase the surface area for processing food without lengthening the intestine. (See also: intestine, mucous membrane, projecting)
válvula espiral
(portuguese) Estrutura em espiral dos intestinos de alguns peixes; prega de membrana mucosa que se projecta no intestino. (See also: intestine, mucous membrane, projecting)

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