HSS 3305 Lecture Notes - Lecture 14: Haematopoiesis, Blood Proteins, Choriocarcinoma
10 Mar 2016
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Decidua parietalis: lines rest of the uterus. Amnionic sac: enclosed within chorion forms a protecive environment. Uteroplacental circulaion: maternal blood circulates around villi: no actual intermixing of maternal and fetal blood. Has endocrine funcion: synthesizes hormones (estrogen; progesterone; protein hormones) Absorbed from fetal intesinal tract into fetal circulaion. Balance is maintained in secreion and excreion of amnionic luid: quanity varies with stage of pregnancy. Fetus unable to swallow and luid accumulates (anencephaly) Fluid is swallowed but not absorbed due to congenital obstrucion of fetal upper intesinal tract: oligohydramnios: reduced volume of amnioic luid. Fetal kidneys failed to develop and no urine is formed. Congenital obstrucion of urethra does not allow urine to form amnionic luid. Hormones produced by endocrine glands by her placenta. Maintains the pregnancy and sustains the fetus: nausea & vomiing during early pregnancy. Usually subsides by the end of the irst trimester. Excessive vomiing, more prolonged and severe than normal.
