Top cell layer of the embryonic disc. Will later form skin, hair, lenses of the eyes, lining of the
internal and external ear, nose, sinues, mouth, anus, tooth enamel, pituitary and mammary glands,
and all parts of the nervous system.
Middle cell layer of the embryonic disc. The precursor to the muscles, bones, lymphatic tissue,
spleen, blood cells, heart, lungs, reproductive and excretory systems.
Inner cell layer of the embryonic disc. Will later form the lining of the lungs, the tongue, tonsils,
urethra and associated glands, bladder and digestive tract.
Epidermis and Brain Embryonic gut
structures system Lining of Glands Lining of
(skin, nails, etc.) digestive respiratory
Muscle Outter covering
of internal organs
Dermis Circulatory system Bones and cartilage
Taken from: http://www.luc.edu/faculty/wwasser/dev/layer.htm