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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: Overview, Anatomy, Function Complications - Cleveland Clinic
    The placenta helps to keep your baby alive and healthy during pregnancy Your blood passes through the placenta and provides oxygen, glucose and nutrients to your baby through the umbilical cord The placenta can also filter out harmful waste and carbon dioxide from your baby's blood
  • Placenta - Wikipedia
    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 a structure that develops in the uterus during pregnancy In most pregnancies, the placenta is located at the top or side of the uterus In placenta previa, the placenta is located low in the uterus The placenta might partially or completely cover the cervix, as shown here
  • 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
  • Placenta: Its Role and Complications - Verywell Health
    The placenta has two different sides, the maternal side and the fetal side These are held together by outgrowths, called anchoring villi, from the maternal component The placenta is surrounded by a placental membrane or barrier, where the exchange of substances occurs between mother and fetus
  • What is the placenta? - American Journal of Obstetrics Gynecology
    Discarded at birth, the placenta is a highly complex and fascinating organ During the course of a pregnancy, it acts as the lungs, gut, kidneys, and liver of the fetus The placenta also has major endocrine actions that modulate maternal physiology and metabolism and provides a safe and protective milieu in which the fetus can develop
  • What the Placenta Is and How It Forms During Pregnancy - What to Expect
    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
  • What Is a Placenta? Types, Development, Complications - MedicineNet
    The placenta of humans is discoid and hemochorial, which means the shape of the placenta is disc-shaped, and the fetal part of the placenta (chorion) is in direct contact with the blood of the mother
  • 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? - PubMed
    Discarded at birth, the placenta is a highly complex and fascinating organ During the course of a pregnancy, it acts as the lungs, gut, kidneys, and liver of the fetus The placenta also has major endocrine actions that modulate maternal physiology and metabolism and provides a safe and protective …





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