from Wikipedia, the free encyclopedia

The ectoderm (from gr. Εκτος [ ektos ] "outside" and to derma "skin") is the upper or first germ layer of the embryoblast . It is the outer layer of cells after gastrulation . The primitive ectoderm produces the embryonic mesoderm ( primitive streak ) through the process of neurulation (the beginning of the development of the nervous system ).

From the ectodermal cotyledon form:

See also


Individual evidence

  1. ^ Neil A. Campbell , Jane B. Reece : Biology. Spektrum-Verlag 2003, ISBN 3-8274-1352-4 , page 1208