Endoderm

The endoderm.

From inner to outer, the germ cell layers are the endoderm, mesoderm, and ectoderm.

Each of the three layers develops into a different part of the embryo: the endoderm into the respiratory, auditory, and digestive system; the mesoderm into the skeleton and muscles; and the ectoderm into the skin, tooth enamel, and nervous system.

endoderm

Prussian embryologist Robert Remak coined the term "endoderm" in 1835.

The endoderm is the innermost of the three primary germ layers of an embryo.

The endoderm may also be called the hypoblast.