It is called Endoderm
The intestinal tract develops from the endoderm, one of the three embryonic germ layers. The endoderm gives rise to the epithelial lining of the digestive tract, including the intestines, stomach, and associated organs like the liver and pancreas.
mesoderm
Gastrulation is first step towards germ layer development .
E. coli is the name of a germ, or bacterium, that lives in the digestive tracts of humans and animals.There are many types of E. coli, and most of them are harmless. But some can cause bloody diarrhea. These are called enterohemorrhagic.
The tongue is derived from the ectoderm germ layer during early embryonic development.
Endoderm: (most internal germ layer) gives rise to the lining of the digestive tract and the organs derived from it, such as the liver and lungs of vertebrates.Mesoderm: (middle germ layer) forms muscle, the skeletal system, and the circulatory system.Ectoderm: (most exterior germ layer) gives rise to the outer covering and, in some phyla, to the central nervous system.
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.
Melanocytes are derived from the neural crest, which is a transient embryonic structure that forms from the ectoderm germ layer.
endoderm
Ectoderm
The primary germ layer that forms the brain and spinal cord is called the ectoderm.
Nervous tissue is derived from the ectoderm germ layer during embryonic development.