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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
    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: 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
  • What Is the Placenta — and How Does It Help Your Baby Grow?
    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: Overview, Anatomy, Function Complications
    The placenta forms in your uterus during pregnancy It provides oxygen and nutrients to your baby through the umbilical cord It's delivered after your baby
  • 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
  • Human Placenta Project: How Does the Placenta Form?
    Human Placenta Project: How Does the Placenta Form? The following illustrations show how the human placenta develops The timeline of placental development illustrates how the placenta changes over the course of pregnancy





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