Anatomical structures and their Origin in general

Ectoderm

Structures meeting the external environment are ectodermal in origin:Skin
Mucous covering of parts of external orifices

  1. Oral cavity
  2. Anal canal
  3. Vagina
  4. Urethra

Mesoderm

  1. Serous lining of body cavities and endothelial lining of CVS,lymphatics and lymphnodes
  2. Bone,muscle,cartilage
  3. Connective tissue of skin
  4. Blood vessels

Endoderm

Epithelial lining of structures meeting alimentary canal

  1. GIT
  2. Ducts and acini of salivary glands(except parotid)
  3. Eustachian tube and middle ear
  4. Biliary system
  5. Parenchyma of the liver
  6. Respiratory system
  7. Ducts and acini of pancreas

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