Definitionn. the outermost membranous sac enclosing the embryo in higher vertebrates
Last update: June 28, 2015
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Most insect eggs are of an elongate oval shape; some are globular, others flattened, while others again are flask-shaped, and the outer envelope (chorion) is often beautifully sculptured (figs. [Please select]
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Exochorion: that part of the chorion derived from the ectoderm: the outer layer of the chorion. [Please select]
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The one layer of the allantois is spread over the outer surface of the amnion and the other over the inner surface of chorion. [Please select]
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