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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 - Wikipedia
    In humans, a thin layer of maternal decidual (endometrial) tissue comes away with the placenta when it is expelled from the uterus following birth (sometimes incorrectly referred to as the 'maternal part' of the placenta)
  • 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: Purpose, Anatomy, Function Complications
    The placenta is a temporary organ that forms in your uterus during pregnancy It attaches to your uterine wall and provides nutrients and oxygen to the fetus through the umbilical cord
  • What Is the Placenta — and How Does It Help Your Baby Grow?
    The placenta is your baby’s lifeline This pancake-shaped organ connects your baby to your body via the umbilical cord, delivering nutrients, oxygen, and removing waste — all while keeping harmful germs at bay
  • 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 Your Placenta and What Does It Do? - ScienceInsights
    The placenta nourishes your baby, produces hormones, and does much more Here’s what it is, how it works, and what happens after birth





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