AskDefine | Define conceptus

Dictionary Definition

conceptus n : an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life [syn: embryo, fertilized egg]

User Contributed Dictionary

English

Etymology

Derived from the Latin concipere

Noun

  1. The fetus or embryo, including all the surrounding tissues protecting and nourishing it during pregnancy.

Extensive Definition

Conceptus (latin is conceptio, derivatives of zygote) denotes the embryo and its adnexa (appendages or adjunct parts) or associated membranes (i.e. the products of conception) The conceptus includes all structures that develop from the zygote, both embryonic and extraembryonic. It includes the embryo as well as the embryonic part of the placenta and its associated membranes - amnion, chorionic (gestational sac), and yolk sac.
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