Chorion and Placenta Presentation PDF
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Uploaded by WonderfulMagicRealism
Dubai Medical College for Girls
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Summary
This presentation details the chorion and placenta, their development, and functions in pregnancy. It outlines the key concepts, including the formation of chorionic villi, placental circulation, and functions such as respiration, nutrition, and hormone secretion, along with identifying anomalies related to shape and size of the placenta.
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Chorion and Placenta KEY CONCEPTS AND OVERVIEW Chorion Overview The chorion is a membrane formed by the trophoblast and the extraembryonic mesoderm. After implantation, the trophoblast differentiates into: 1. Outer Syncytiotrophoblast: Multinucleated syncytium in direct contact with...
Chorion and Placenta KEY CONCEPTS AND OVERVIEW Chorion Overview The chorion is a membrane formed by the trophoblast and the extraembryonic mesoderm. After implantation, the trophoblast differentiates into: 1. Outer Syncytiotrophoblast: Multinucleated syncytium in direct contact with the uterine wall. 2. Inner Cytotrophoblast: Cellular layer with distinct boundaries. Development of Chorionic Villi 1. Primary Villi: Formed by syncytiotrophoblast processes with cytotrophoblast cords. 2. Secondary Villi: Invasion of extraembryonic mesoderm into primary villi. 3. Tertiary Villi: Invasion of blood vessels from the umbilical vessels. Placenta Formation The placenta is formed by: 1. Fetal Component: Chorion frondosum. 2. Maternal Component: Decidua basalis. Fully formed by the fourth month of pregnancy. Link to important videos https://youtu.be/g7FExgKr-x4?si=X_Cc7Ir5ueoYhzzh https://youtu.be/73k0k8qXAow?si=cqVRMQ1o6focDHuD https://youtu.be/bped-RVWsLk?si=Qg-4ydS2u_rA_1hQ Functions of the Placenta 1. Respiration: Acts as the fetal lung. 2. Nutrition: Transfers nutrients from maternal to fetal blood. 3. Excretion: Removes fetal waste products. 4. Protection: Acts as a barrier to most bacteria. 5. Endocrine: Secretes pregnancy hormones like hCG and progesterone. Placental Circulation Fetal Circulation: - Deoxygenated blood via umbilical arteries. - Oxygenated blood via umbilical vein. Maternal Circulation: - Blood enters intervillous spaces via spiral arterioles. - Leaves via decidual venules. Size Anomalies: Small placenta in hypertension, large placenta in fetal hydrops. Shape Anomalies: Bipartite, Anomalies of the tripartite, or succenturiate Placenta lobes. Position Anomalies: Placenta previa (lateralis, marginalis, centralis).
