The temporary anatomical structures prominent in the first trimester may be fulfilling exchange functions assigned to the placenta in the second and third trimester.
نویسندگان
چکیده
The extra-embryonic coelom (EEC) and secondary yolk sac are prominent structures in the gestational sac during the first trimester of human pregnancy, at a time before the definitive placental circulation becomes established. We propose that the EEC and yolk sac play a critical role in the nutrition of early pregnancy, fulfilling exchange functions which are assumed by the placenta at a later stage.
منابع مشابه
Hemoperitoneum Caused by Placenta Percreta in the Third Trimester of Pregnancy
The placental adhesive disorders such as placenta accreta and placenta percreta are the rare causes of serious obstetric hemorrhages. They are associated with high maternal morbidity and mortality. Placenta percreta is usually diagnosed in the third trimester of pregnancy as a massive postpartum hemorrhage when an attempt to remove the placenta reveals lack of a cleavage plane. Here we report a...
متن کاملمقایسه تاثیر اکسی‌توسین وریدی با میزوپروستول رکتال در مرحله سوم زایمان بعد از القاء سقط طبی در سه ماهه دوم حاملگی
Background: Induction of medical abortion during the second trimester of pregnancy is considered under certain medical conditions. Abortion in the second trimester of pregnancy could be accompanied by several side effects including hemorrhage and placenta retention. Several types of medications including oxytocin, ergots, and prostaglandins are used to control and optimize the third stage of la...
متن کاملI-40: Ultrasound in Multiple Pregnancy
Ultrasound has revolutioned the care of women carring twins. First trimester evaluation is the best time to determine chorioniocity and amnioniocity in multiple gestations. First trimester diagnosis is based on the number of gestational sacs, amnions and yolk sacs. Growth rate in multiple multiple gestations during the fist and early second trimesters parallels the growth rate of singleton preg...
متن کاملبررسی ید دفعی در طول دوران بارداری بخش زیوه در شهرستان ارومیه
Background & Aims: Thyroxin is important for the development of fetus brain during early pregnancy. Low body iodine stores during gestation may be present as hypothyroidism in the mother and/or dysfunction in the fetus nervous system. The aim of the present study was to evaluate the trend of urinary iodine excretion (UIC) during pregnancy in Zive District of Urmia County. Materials & Me...
متن کاملSerum zinc level in third trimester of pregnant women
Zinc is one of the most important micronutrient with essential role in biochemical regulation of the body functions. The importance of zinc in pregnancy period was widely studied in various countries. Variation in zinc plasma levels during pregnancy needs more investigation, because maternal zinc deficiencies may cause some severe abnormalities in the fetus. In this study the plasma level...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Human reproduction
دوره 11 6 شماره
صفحات -
تاریخ انتشار 1996