Epiboly is a process in embryonic development where a sheet of cells spreads over the surface of another cell mass. It is a fundamental mechanism that contributes to the formation of various structures in the embryo. What are the main features of epiboly?

• Cell spreading: Cells migrate outwa...

Invagination is a biological process where a sheet of cells folds inward to form a pocket or tube. It is a common mechanism in embryonic development and plays a crucial role in the formation of various structures. What are the main features of invagination?

• Cell movement: Invagination invol...

Ingression is a process in embryonic development where individual cells migrate from the surface layer (ectoderm or mesoderm) into the interior of the embryo. It is a fundamental mechanism that contributes to the formation of various tissues and organs. What are the main features of ingression?

...

The Spemann organizer, also known as the dorsal blastopore lip, is a small region of tissue in the amphibian embryo that plays a crucial role in determining the body plan. It is named after Hans Spemann, a German embryologist who discovered its importance in the early 20th century. What are the main...