placentation(redirected from free central placentation)
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Related to free central placentation: axile placentation, basal placentation, apical placentation, parietal placentation, Hemochorial
the series of events following implantation of the embryo and leading to development of the placenta.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
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.
Farlex Partner Medical Dictionary © Farlex 2012
a. Formation of a placenta in the uterus.
b. The type or structure of a placenta.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
placentationObstetrics The formation of the placenta in the uterus; the process by which a placenta grows and develops in the uterus. See Extrachorial placentation.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
The structural organization and mode of attachment of fetal to maternal tissues in the formation of the placenta.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
placentationthe arrangement of PLACENTAS (2) in the plant ovary, which can be classified into several categories including:
- (a) apical, at the ovary apex,
- (b) basal, at the ovary base,
- (c) parietal, on the ovary wall,
- (d) free-central, on a column growing up from the ovary base.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005