147
CHAPTER FIVE
Tissues
(b)
(a)
(d)
(c)
Free surface
of tissue
Simple
squamous
epithelium
Basement
membrane
Nucleus
Free surface
of simple
squamous
epithelium
Nucleus
Connective
tissue
FIGURE 5.2
Simple squamous epithelium consists of a single layer of tightly packed, F
attened cells (670×). (
a
) and (
b
) side view, (
c
) and (
d
) surface view.
Nucleus
Basement
membrane
Free surface
of tissue
Simple
cuboidal
epithelium
Connective
tissue
Lumen
(a)
(b)
FIGURE 5.3
Simple cuboidal epithelium consists of a single layer of tightly packed, cube-shaped cells (630×).
Stratif
ed Squamous Epithelium
Stratified epithelium is named for the shape of the cells
forming the outermost layers.
Stratif
ed squamous epithe-
lium
consists of many layers of cells, making this tissue rela-
tively thick. Cells nearest the free surface are fl attened the
most, whereas those in the deeper layers, where cell division
occurs, are cuboidal or columnar. As the newer cells grow,
older ones are pushed farther and farther outward, where
they fl
atten
(f
g. 5.7)
.
The outermost layer of the skin (epidermis) is stratiF ed
squamous epithelium. As the older cells are pushed outward,
they accumulate a protein called
keratin,
then harden and
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