The chorion is the outermost membrane around the embryo in mammals, birds and reptiles. It develops from an outer fold on the surface of the yolk sac.^[1] In insects, the chorion is the outer shell of the insect egg^[1], which lies outside the vitteline envelope and is developed by the follicle cells while the egg is in the ovary.^[2]

[edit] Footnotes

1. ^ ^{a b} Entry of 'chorion' in the Encyclopaedia Brittanica website [1]. Retrieved on 26 Sep 2009.
2. ^ Chapman, R.F. (1998) "The insects: structure and function", Section The egg and embryology. Previewed in Google Books [2] on 26 Sep 2009.

[edit] References

• Chapman, R.F. (1998) The insects: structure and function. (4th Ed). Cambridge University Press. ISBN 0521578906, ISBN 9780521578905.

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