Serous membranes have an underlying connective tissue layer called the lamina propria.

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Serous membranes consist of two layers: an outer layer of simple squamous epithelium called mesothelium and an underlying thin layer of loose connective tissue, but this layer is not referred to as the lamina propria. The term "lamina propria" is specifically used to describe the connective tissue layer of mucous membranes, not serous membranes.

Serous Membranes Have an Underlying Connective Tissue Layer Called the Lamina