placentation

placentation

 [plas″en-ta´shun]

the series of events following implantation of the embryo and leading to development of the placenta.

plac·en·ta·tion

(plas'en-tā'shŭn),

The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta. Types of placentation are defined under placenta.

placentation

(plăs′ən-tā′shən)

n.

a. Formation of a placenta in the uterus.

b. The type or structure of a placenta.

placentation

Obstetrics The formation of the placenta in the uterus; the process by which a placenta grows and develops in the uterus. See Extrachorial placentation.

plac·en·ta·tion

(plas'en-tā'shŭn)

The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta.

placentation

the arrangement of PLACENTAS (2) in the plant ovary, which can be classified into several categories including:

1. (a) apical, at the ovary apex,
2. (b) basal, at the ovary base,
3. (c) parietal, on the ovary wall,
4. (d) free-central, on a column growing up from the ovary base.