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placenta    音标拼音: [pləs'ɛntə]
n. 胎盘,胎座

胎盘,胎座

placenta
n 1: that part of the ovary of a flowering plant where the
ovules form
2: the vascular structure in the uterus of most mammals
providing oxygen and nutrients for and transferring wastes
from the developing fetus

Placenta \Pla*cen"ta\, n.; pl. L. {Placent[ae]}, E. {Placentas}.
[L., a cake, Gr. ? a flat cake, from ? flat, fr. ?, ?,
anything flat and broad.]
1. (Anat.) The vascular appendage which connects the fetus
with the parent, and is cast off in parturition with the
afterbirth.
[1913 Webster]

Note: In most mammals the placenta is principally developed
from the allantois and chorion, and tufts of vascular
villi on its surface penetrate the blood vessels of the
parental uterus, and thus establish a nutritive and
excretory connection between the blood of the fetus and
that of the parent, though the blood itself does not
flow from one to the other.
[1913 Webster]

2. (Bot.) The part of a pistil or fruit to which the ovules
or seeds are attached.
[1913 Webster]


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  • Placenta: How it works, whats normal - Mayo Clinic
    The placenta is an organ that forms in the womb, also called the uterus, during pregnancy The placenta is connected to a developing baby by a tubelike structure called the umbilical cord
  • Placenta - Wikipedia
    Placenta The placenta (pl : placentas or placentae) is a temporary embryonic and later fetal organ that begins developing from the blastocyst shortly after implantation
  • Placenta: Overview, Anatomy, Function Complications
    The placenta enables the exchange of oxygen and nutrients between the bloodstreams of you and your baby without ever mixing them It acts as your baby's lungs, kidneys and liver until birth
  • What the Placenta Is and How It Forms During Pregnancy
    The placenta is a pancake-shaped organ that develops in the uterus exclusively during pregnancy It’s made up of blood vessels and provides your developing baby with nutrients, water, oxygen, antibodies against diseases and a waste removal system
  • Placenta - What Is It and How It Works | Biology Dictionary
    The placenta is an organ which is responsible for nourishing and protecting a fetus during pregnancy It is unique in that it is a temporary organ; it grows alongside the fetus during pregnancy, and then is expelled along with the fetus at birth
  • The placenta: What it is and how it works - BabyCenter
    The placenta is a pancake-shaped organ that develops within the wall of your uterus and connects to your baby though the umbilical cord By the end of pregnancy, it grows to be about 9 inches in diameter and about an inch thick at the center
  • What Is the Placenta? - TheBump. com
    Exhibit A: the placenta This fascinating organ develops during pregnancy along with baby and plays a crucial role in keeping your little one healthy in the womb But what is placenta, exactly, and what does a placenta do? Pull up a seat for you and your growing bump—there’s a lot to cover
  • Placenta 101: What Every Expectant Mother Should Know
    The placenta is an essential organ that helps keep your baby healthy and growing during pregnancy Learn more about its purpose and other important facts
  • Behind Every Healthy Baby is a Healthy Placenta
    A healthy placenta is the single most important factor in producing a healthy baby The placenta, which is in fact part of the fetus, is critical for all aspects of pregnancy from implantation to delivery





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