BPK 375 Lecture Notes - Lecture 4: Hypoglycemia, Bipolar Disorder, Abdominal Wall
28 Sep 2016
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Bpk 375 week 3 lecture & reading 3 notes. Introduction (review from last week, slide 2 on lecture 3) Separation by the placenta protects the fetus from potentially dangerous substances in maternal blood, and from high blood pressure which could damage the fetus. Placenta begins to develop in the pre-embryonic period when syncytiotrophoblast and chorionic villi invade the uterine endometrium. The maternal contribution to the placenta originates from the tissues surrounding the invaded region of the endometrium called the decidua basalis. The chambers separated by the placental septa result from the invasion by both the chorionic villi and the lacunae into the decidua basalis. The intervillous spaces that do not contain villi arose from the lacunae of the syncytiotrophoblast. Maternal blood enters the intervillous space from endometrial arteries and surrounds the chorionic villi (increases sa for exchange). Gases that pass through the villi walls move into the fetalcirculatory system via the umbilical vein.
