CHAPTER 3
Epithelium and Glands
49
SYNOPSIS 3-4
Glands Classif ed by Product
Serous glands
: Generate serous product, which is a thin, watery fl
uid containing proteins, glycoproteins, and water.
Mucous glands
: Produce mucin, which is a thick, viscous material containing high concentration of glycosylated glyco-
proteins and water.
Mixed glands
: Consist of both serous and mucous secretary cells and produce serous and mucous materials.
Sebaceous
glands
: Produce lipids (sebum), which contains an oily substance.
Figure 3-19A.
Serous acinus from
the parotid gland.
EM,
3
5,200
Cells that produce
serous
(thin,
proteinaceous fl
uid) secretions have
features in common whether they
are from one of the salivary glands
or from the pancreas. The
nuclei
are
relatively large with considerable
euchromatin
and one or more promi-
nent
nucleoli
. The cytoplasm in the
basal region is F lled with
RER
. The
apical cytoplasm contains
secretory
vesicles
(
granules
), which vary in
their staining characteristics.
Nucleous
RER
Secretory
granules
(vesicles)
Nucleus
Lumen
Lumen
Lumen
A
B
Nucleous
Secretory
granules
(vesicles)
Nucleus
Myoepithelial
cell
Lumen
Lumen
Lumen
Figure 3-19B.
Mucous
acinus
from the submandibular gland.
EM,
3
6,300
Although
mucus
-
secreting
cells
have
the same general organization as cells
that produce serous secretions, there
are some distinctions. The
mucous
acinus
cell has a
smaller nucleus
,
which is located against the basal
edge of the cell. In addition, the
secre-
tory granules
are generally more elec-
tron lucent than secretory granules of
serous secreting cells.
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