Ectoderm
Structures meeting the external environment are ectodermal in origin:Skin
Mucous covering of parts of external orifices
- Oral cavity
- Anal canal
- Vagina
- Urethra
Mesoderm
- Serous lining of body cavities and endothelial lining of CVS,lymphatics and lymphnodes
- Bone,muscle,cartilage
- Connective tissue of skin
- Blood vessels
Endoderm
Epithelial lining of structures meeting alimentary canal
- GIT
- Ducts and acini of salivary glands(except parotid)
- Eustachian tube and middle ear
- Biliary system
- Parenchyma of the liver
- Respiratory system
- Ducts and acini of pancreas
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