Each germ layer's cells undergo differentiation to become tissues and embryonic organs. The nervous system and the epidermis are two examples of tissues that develop from the ectoderm. The body's connective tissue and muscle cells are derived from the mesoderm.
During embryonic development, a small number of cells produce committed progenitor or precursor cells that are highly proliferative and go on to differentiate into the cells of the adult tissues.
The primitive intestine is lined by epithelium, a type of tissue in which the cells are closely connected to create sheets. Organs include the digestive system, liver, and the primitive gut derive from this epithelial layer.
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