4
Chapter 4
Tissue: The Living Fabric
141
Cutaneous
membrane
(skin)
The cutaneous membrane (the skin) covers the body surface.
Mucous membranes line body cavities
that are open to the exterior.
Mucosa of
nasal cavity
Mucosa of
lung bronchi
Mucosa of
mouth
Esophagus
lining
Parietal
pericardium
Visceral
pericardium
(c) Serous membranes
Parietal
peritoneum
Visceral
peritoneum
Parietal
pleura
Visceral
pleura
(a) Cutaneous membrane
(b) Mucous membranes
Serous membranes line body cavities
that are closed to the exterior.
Figure 4.11
Classes of membranes.
Mucous Membranes
Mucous membranes
, or
mucosae
(mu-ko
9
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
term
mucosa
refers to the location of the membrane,
not
its cell
composition, which varies. However, most mucosae contain either
stratified squamous or simple columnar epithelia. Te epithelial
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