52
UNIT 2
Basic Tissues
Figure 3-23A.
A simple coiled tubular gland.
The
simple coiled tubular gland
has a
long
excretory
duct
that is
unbranched
(
indicated in blue
). The
secretory portions
are formed by
coiled tubules
.
The
heavy black line
represents the approximate
plane of the section in Figure 3-23B.
Figure 3-23B.
Sweat gland of the skin.
H&E,
3
377
Sweat glands in the integument (skin)
are examples of
simple
coiled tubular glands
. The
secretory cells
form
coiled tubules
that
are lined by simple cuboidal cells. The excretory ducts are lined
by strati± ed cuboidal epithelium. The ducts are long, unbranched,
and open at the skin surface.
Figure 3-24A.
A simple acinar gland.
The
simple acinar gland
has a
short
,
unbranched
duct
(
blue cells
). The secretory portion is formed
by
secretory cells
arranged in an
unbranched
acinus
or
alveolus
(a small, grape-shaped secretory
unit). The
heavy black line
represents the approxi-
mate plane of the section in Figure 3-24B.
Figure 3-24B.
Penis.
H&E (perfusion),
3
158
Small mucous glands (
Littré glands
) in the submucosa of the male
urethra are examples of
simple acinar glands
. They have very short
excretory ducts that are directly linked to the surface of the epithe-
lium. The
mucous
secretory cells
are arranged in
acinar
form.
D. Cui
Excretory
duct
Secretory
cells
A
Secretory
Secretory
cells
cells
Duct-forming cells
Duct-forming cells
Secretory
cells
Duct-forming cells
B
D. Cui
Secretory
cells
Excretory
duct
A
Secretory
Secretory
cells
cells
Secretory
cells
B
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