cotyledon (redirected from Cotyledons)

cotyledon /cot·y·le·don/ (kot″ĭ-le´d'n)

1. the seed leaf of the embryo of a plant.

2. any subdivision of the uterine surface of the placenta.

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cot·y·le·don (ktl-dn)

n.

1. One of the lobules constituting the uterine side of the placenta, consisting mainly of a rounded mass of villi.

2. A leaf of the embryo of a seed plant, which, upon germination, either remains in the seed or emerges, enlarges, and becomes green; a seed leaf.

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cotyledon

[kot′ilē′don]

Etymology: Gk, kotyledon, cup-shaped

one of the visible segments on the maternal surface of the placenta. A typical placenta may have 15 to 28 cotyledons, each consisting of fetal vessels, chorionic villi, and intervillous space.

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cotyledon [kot″ĭ-le´don]

1. any subdivision of the uterine surface of the placenta.

2. irregular convex areas on the chorionic surface of the placenta, consisting of two or more stem villi and their many branch villi; by the end of the fourth month the decidua basalis is almost entirely replaced by the cotyledons.

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Cotyledon

African genus of the plant family Crassulaceae; contains bufadienolide, cardiac glycosides; causes krimpsiekte (cotyledonosis). Includes C. orbiculata (C. decusata, C. leucophylla), C. umbilicus (Umbilicus rupestris, navelwort, pennywort). Many species have been reclassified as Tylecodon spp.

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cotyledon

1. any subdivision of the uterine surface of the human placenta.

2. discrete elevations of chorioallantoic tissue of the ruminant fetal membranes that adhere intimately with the maternal caruncles to form placentomes. See also caruncle.