BIO380H5 Lecture Notes - Lecture 23: Yolk Sac, Gastrointestinal Tract, Foregut
Document Summary
Bio 380 lecture 23 the digestive system. The endoderm is connected to the yolk sac. The embryo folds ventrally to form the developing heart. The embryo also folds laterally to form a tube structure. The foregut which will form the pharynx. The yolk sac is constricted which will remove the yolk sac to from the gut tube. The allantois is open to the hind gut but closed to the body stalk; it travels into the body stalk and the mesenchymal cells surround it will form the future blood vessels of the umbilical cord. At the 26th day of development, you can see the heart, lungs and the developing liver; anterior and posterior neuropore is closed; the gut tube is more prominent and still connected to the yolk sac. The foregut forms the stomach, pharynx and esophagus. Each organism developed within the endoderm is under the influence of some combination of.
