Delve into the intricate process of placental development in this comprehensive lecture on embryology. Explore the formation of the placenta and its crucial metabolic and hormonal functions. Learn about key stages including ampulla formation, endometrial attachment, lacunae development, and the role of extra-embryonic mesoderm. Understand the structure of placental septa and chorionic leave. Gain insights into the various functions the placenta performs during pregnancy. Perfect for medical students, aspiring healthcare professionals, or anyone interested in human development.