Ectoderm

Definition

The ectoderm is one of the three primary germ layers in the very early embryo that gives rise to the outermost layer of an organism, including structures such as skin, hair, and nails, as well as parts of the nervous system. It plays a crucial role in forming both external features and some internal systems.

Related terms

Mesoderm:

The middle germ layer that develops into muscles, bones, circulatory system, and other internal organs.

Endoderm:

The innermost germ layer that forms internal structures such as the lining of the digestive tract and lungs.

Neural tube: A structure in early embryonic development formed from ectoderm that eventually gives rise to the central nervous system