Body Layers and Cavities

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Diagrams of the body layers and cavities in A, coelenterates; B, flatworms; C, annelids; D, vertebrates. Labels: G, gastric cavity; g, cavity of the gonad; a, primary body cavity (blastocoele) filled with branched cells (mesenchyme); c, secondary body cavity (coelom); d, dorsal mesentery; m, mesenchyme filling space of original primary body cavity; n, nerve tube.


Beach, Fredrick Converse The Encyclopedia Americana (New York, NY: The Americana Company, 1903)


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