NATS 1675 Lecture Notes - Lecture 14: Umbilical Cord, Chorionic Villi, Amniotic Sac
4 Aug 2015
School
Department
Course
Professor
Document Summary
The membranes that support the embryo are called extra-embryonic membranes. These are for the most part, part of the embryo. There are 4 extra-embryonic membranes this is very, very early in the development of the embryo (right) chorion is essentially an endocrine gland because it secretes a hormone. Chorion becomes part of the placenta (left) yolk-sac hangs around for a few weeks, not very long serves as an early cite for red blood cell formation has a few nutrients but not a lot. Amnion forms the bag of water when your water breaks, this is due to the amnion rupturing. Allantois contributes to the umbilical cord. Amnion encloses the embryo and fetus in a fluid filled environment. Membrane is of embryonic origin (mesoderm) and encloses the embryo/fetus in a fluid filled environment: the amniotic cavity. The amniotic fluid is produced by filtration from the maternal and fetal blood vessels. In later stages, fetal urine also enters the amniotic fluid.
