Tissue: The Living Fabric
The cutaneous membrane (the skin) covers the body surface.
Mucous membranes line body cavities
that are open to the exterior.
(c) Serous membranes
(a) Cutaneous membrane
(b) Mucous membranes
Serous membranes line body cavities
that are closed to the exterior.
Classes of membranes.
se), line all body cavi-
ties that open to the outside of the body, such as the hollow organs
of the digestive, respiratory, and urogenital tracts (Figure 4.11b).
In all cases, they are “wet,” or moist, membranes bathed by secre-
tions or, in the case of the urinary mucosa, urine. Notice that the
refers to the location of the membrane,
composition, which varies. However, most mucosae contain either
stratiﬁed squamous or simple columnar epithelia. Te epithelial