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Characteristics Of Epithelial Tissues Practice Test

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Which germ layer forms the serous lining of body cavities?
Correct Answer:
Mesoderm
Explanation:
The serous lining of body cavities comes from the mesoderm. These serous membranes are made of mesothelium, a simple squamous epithelium that lines the peritoneal, pleural, and pericardial cavities, and it originates from the middle germ layer. The other germ layers have different roles: endoderm forms the mucosal lining of the gut and associated organs, ectoderm forms the skin and nervous system, and neural crest (an ectodermal derivative) contributes to various structures but not the serous membranes. So the germ layer responsible for the serous lining is mesoderm.

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