Reptile Development

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“Origin of amnion and allantois. 1. Rise of amniotic folds (a.f.) around embryo (e); p.p., pleuro-peritoneal cavity; y., yolk. 2. Further growth of amniotic folds (a.f.) over embryo and around yolk. 3. Fusion of amniotic folds above embryo; a.p., amnion proper; s.z.m., subzonal membrane; y.s., yolk-sac. 4. Outgrowth of allantois (al.); amniotic cavity (a.c.); h., head end; t. tail end. 5. Complete enclosure and reduction of yolk-sac (y.s.); s.z.m, subzonal membrane; a.p., amnion proper; al., allantois; g., gut of embryo.” -Thomson, 1916

Keywords

reptile development, reptile amnion, reptile allantois, reptile embryo, reptile egg

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Reptile Anatomy

Source

J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)

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