From which germ layer do hepatocytes originate?

From which germ layer do hepatocytes originate?

• A. Ectoderm
• B. Endoderm
• C. Mesoderm
• D. Neural crest

Answer: (B)

Hepatocytes come from the endoderm—the inner germ layer that forms the lining of the gut and the epithelium of many internal organs. During development, the foregut endoderm gives rise to a hepatic outgrowth called the hepatic diverticulum, which differentiates into hepatocytes (the main functional cells of the liver). The surrounding mesoderm provides the supportive stroma, blood vessels, and biliary ducts, but the liver’s parenchymal cells themselves originate from endodermal tissue. In contrast, the ectoderm forms structures like the skin and nervous system, the mesoderm gives rise to muscle, bone, and connective tissues, and neural crest cells come from ectoderm as well. This is why the liver’s functional cells are classified as endodermal derivatives.

Hepatocytes come from the endoderm—the inner germ layer that forms the lining of the gut and the epithelium of many internal organs. During development, the foregut endoderm gives rise to a hepatic outgrowth called the hepatic diverticulum, which differentiates into hepatocytes (the main functional cells of the liver). The surrounding mesoderm provides the supportive stroma, blood vessels, and biliary ducts, but the liver’s parenchymal cells themselves originate from endodermal tissue.

In contrast, the ectoderm forms structures like the skin and nervous system, the mesoderm gives rise to muscle, bone, and connective tissues, and neural crest cells come from ectoderm as well. This is why the liver’s functional cells are classified as endodermal derivatives.