CHAPTER 3
Epithelium and Glands
51
Figure 3-21A.
A simple tubular gland.
The
secretory cells
of this
simple tubular gland
are
arranged in
straight tubules
, and the gland has
no duct
.
The
heavy black line
represents the approximate plane of
the section in Figure 3-21B.
A
D. Cui
Surface
epithelium
Secretory
cells
B
Surface
Surface
epithelium
epithelium
Secretory
Secretory
cells
cells
Lumen
Surface
epithelium
Secretory
cells
Figure 3-21B.
Large intestine.
H&E,
3
99
An example of the
simple tubular glands
in the large intestine is
shown. The
secretory cells
(
goblet cells
) are arranged in
straight
tubules
, and secretory products are released directly into the
lumen
of the intestine. This type of gland also can be found in
the small intestine.
Figure 3-22A.
An example of a simple branched
tubular gland.
This type of gland has no duct, and the
secretory cells
of
the
simple branched tubular gland
are arranged in
two or
more branched tubules
. The
heavy black line
represents
the approximate plane of the section in Figure 3-22B.
Figure 3-22B.
Stomach.
H&E,
3
198
An example of the
simple branched tubular glands
in the
stomach is shown. The
surface epithelium
invaginates to form
gastric pits
. The secretory cells form
branched tubular gastric
glands
that empty their secretory products into gastric pits.
D. Cui
Surface
epithelium
Gastric pit
Secretory
cells
A
Gastric pits
Gastric pits
Surface
Surface
epithelium
epithelium
Branched
Branched
secretory tubules
secretory tubules
Gastric pits
Surface
epithelium
Branched
secretory tubules
B
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