48
UNIT 2
Basic Tissues
Exocrine Glands Classif ed by Product
The
exocrine glands
can be classif
ed as
serous glands
,
mucous glands
,
mixed glands
(seromucous), and
sebaceous glands
, depending
on what
type
oF
secretion
is produced.
±igure 3-18A.
Parotid gland.
H&E,
3
668
An example oF a
serous gland
From the parotid
gland is shown. Each
serous secretory cell
has a
spherical nucleus, the cytoplasm is basophilic, and
the secretory vesicles (granules) are located in the
apical part oF the cytoplasm. These serous cells are
organized in acini and produce a watery
proteina-
ceous
secretion.
A
Serous
Serous
cells
cells
Serous
cells
B
Mucous
Mucous
cells
cells
Mucous
cells
±igure 3-18B.
Duodenum.
H&E,
3
396
An example oF a
mucous gland
in the duodenum
is shown. The
mucous secretory cell
has a fl attened
nucleus at the base oF the cell and an empty vacuo-
lated appearance oF the apical cytoplasm. This refl ects
the removal oF the mucus From the secretory gran-
ules during processing oF the specimen. These cells
are arranged in tubules and produce gellike
mucin
(
glycoprotein
and water mixture) secretions that
usually protect or lubricate epithelial cell surFaces.
C
Serous
Serous
cells
cells
Serous
cells
Serous
Serous
demilune
demilune
Serous
demilune
Mucous
Mucous
cells
cells
Mucous
cells
±igure 3-18C.
Sublingual gland.
H&E,
3
609
An example oF a
mixed gland
, the sublingual
gland, containing both
mucous secretory por-
tions
and
serous secretory portions
is shown. The
serous cells Forming a moon-shaped cap on top oF
the mucus are called a
serous demilune
.
D
Lipid secretary
Lipid secretary
cells
cells
Lipid secretory
cells
±igure 3-18D.
Skin (scalp).
H&E,
3
306
An example oF a
sebaceous gland
in the scalp is
shown. The sebaceous gland cells are tightly packed
together in groups. This type oF gland produces
sebum
, an oily substance that is a mixture oF
lipids
and debris oF dead lipid-producing cells.
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