What is the chorionic vesicle?

The chorionic vesicles are invaginations of the chorion opposite the mouths of uterine glands. A layer of columnar trophoblastic cells covered the villi of the vesicles. These cells had abundant vacuoles and coated pits and vesicles.

What means chorion?

Chorion: The outermost of the two fetal membranes (the amnion is the innermost) that surround the embryo. The chorion develops villi (vascular finger-like projections) and develops into the placenta.

What does chorion mean in medical terms?

: the highly vascular outer embryonic membrane of reptiles, birds, and mammals that in placental mammals is associated with the allantois in the formation of the placenta.

What is the definition of an embryo medical terminology?

Embryo: An organism in the early stages of growth and differentiation, from fertilization to the beginning of the third month of pregnancy (in humans). After that point in time, an embryo is called a fetus.

What is chorionic plate?

The chorionic plate is a synonym for the fetal side of the placenta. The maternal side of the placenta is termed the basal plate. Some pathologies and processes are localized to the chorionic plate, and evaluation of the chorionic plate is a part of placental grading.

What is the main purpose of the chorionic villi?

Chorionic villi make up a significant portion of the placenta and serve primarily to increase the surface area by which products from the maternal blood are made available to the fetus.

What is the function of chorionic villi?

Does chorion mean placenta?

The placental membrane separates maternal blood from fetal blood. The fetal part of the placenta is known as the chorion. The maternal component of the placenta is known as the decidua basalis.

What is the difference of zygote and embryo?

A zygote is defined as the union of male gamete and female gamete during the fertilization process. On the other hand, an embryo is defined as the unborn offspring that is under development. 2. A zygote is the first stage of development.

What is the chorionic plate made of?

The chorionic plate (great part of the placenta on the fetal side) consists of the amnion, the extra-embryonic mesenchyma, the cytotrophoblast and the syncytiotrophoblast.

What is chorionic villi in biology?

Chorionic villi are villi that sprout from the chorion to provide maximal contact area with maternal blood. After circulating through the capillaries of the villi, blood returns to the embryo through the umbilical vein. Thus, villi are part of the border between maternal and fetal blood during pregnancy.

What does the term chorionic villi stand for?

[kor″e-on´ik] pertaining to the chorion. chorionic villi numerous branching projections from the external surface of the chorion that provide for exchange between the maternal and fetal circulation. Oxygen and nutrients in the maternal blood diffuse through the walls of the villi and enter the blood of the embryo or fetus.

What is the medical definition of a chorion?

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. chorion. an extraembryonic fetal membrane, composed of trophoblast lined with mesoderm; it develops villi, becomes vascularized, and forms the fetal part of the placenta. chorion frondo´sum the placental part of the chorion; it is covered by villi.

Where does the chorion develop in the fetus?

Here the chorion develops finger-like outgrowths, the chorionic villi, which project into blood spaces in the uterus of the mother. see CHORIONIC BIOPSY. The outermost membrane of the sac enclosing the fetus.

How are chorionic villi used in early pregnancy?

Chorionic villus sampling has become an important method of early pre-natal screening for genetic defects. Microscopic, finger-like projections that emerge from the outer sac which surrounds the developing baby. Chorionic villi are of fetal origin and eventually form the placenta.