Lexic.us

Definition of Chorion

1. Noun. The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals).

Definition of Chorion

1. n. The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.

Definition of Chorion

1. Noun. The protective and nutritive membrane that attaches higher vertebrate fetuses to the uterus. ¹

2. Noun. The outer case of an insect egg. ¹

3. Noun. The outer membrane of seeds of plants. ¹

¹ Source: wiktionary.com

Definition of Chorion

1. an embryonic membrane [n -S]

Medical Definition of Chorion

1. 1. Protective membrane around the eggs of insects and fishes. 2. Extraembryonic membrane surrounding the embryo of amniote vertebrates. The outer epithelial layer of the chorion is derived from the tropoblast. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Chorion

Literary usage of Chorion

Below you will find example usage of this term as found in modern and/or classical literature:

1. Anatomy: Descriptive and Surgical by Henry Gray (1897)
"The chorion.—We have seen that in the formation of the amnion we had two layers ... The chorion is formed out of the vitelline membrane with the false ..."

2. A Treatise on Human Physiology by John Call Dalton (1882)
"The capillary blood-vessels, with which the chorion is supplied, ... 201), and retrace their course, to unite finally with the venous trunks of the chorion. ..."

3. A Text-book of obstetrics by Barton Cooke Hirst (1909)
"THE chorion. Ill tissue elements continuous with the substance of the umbilical cord and very delicate, atrophied villi connecting it with the decidua ..."

4. A Laboratory Manual and Text-book of Embryology by Charles William Prentiss (1915)
"chorion Laeve and Frondosum.—The villi at first cover the entire surface of the chorion. As the embryo grows more and more out into the uterine cavity the ..."

5. The Principles of Midwifery: Including the Diseases of Women and Children by John Burns (1843)
"At the second month, for instance, it is distinctly seen reflected on the chorion, from the margin of the placenta, and as thick as paper. SECTION TENTH. ..."

6. The Elements of Embryology by Michael Foster, Francis Maitland Balfour, Walter Heape, Adam Sedgwick (1883)
"Since however the allantois does not always come in contact with the whole inner surface of the subzonal membrane the term chorion is apt to be somewhat ..."

7. Manual of physiology by William Senhouse Kirkes (1857)
"The villi of the chorion consist at first entirely of cells bounded by an external layer of ... When the ovum, with its villous chorion, reaches the uterus, ..."

8. A Laboratory Text-book of Embryology by Charles Sedgwick Minot (1903)
"The origin of the chorion laeve and the disappearance of its villi have been ... Pieces of the decidua vera of from six to nine months with the chorion and ..."

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