CHAPTER 3
Epithelium and Glands
55
Types of Glands
Shape of the
Ducts
Shape of the
Secretory Units
Secretory Products
Main Locations
Unicellular Glands
(
Consist of Single Cells
)
Goblet cells
No ducts; products
released directly
onto surface of an
epithelium
Single cell, goblet
shaped
Mucus (glycoprotein
and water)
Epithelium in
respiratory and
digestive tracts
Multicellular Glands
(
Consist of Multiple Secretory Cells
)
Simple tubular glands
No ducts
Single straight tubules
Mucus (glycoprotein
and water)
Small and large
intestines
Simple branched
tubular glands
No ducts
Two or more branched
tubules
Mucus (glycoprotein
and water)
Stomach (pyloric
glands)
Simple coiled tubular
glands
Long, unbranched
ducts
Coiled tubules
Watery fl uid (sweat)
Sweat glands in the
skin
Simple acinar glands
Short, unbranched
ducts
Unbranched acini
Mucus (glycoprotein
and water)
Littr
é
glands in the
submucosa of the male
urethra
Simple branched acinar
glands
Short, unbranched
ducts
Branched acini
Sebum (mixture of lipids
and debris of dead
lipid-producing cells)
Sebaceous glands of
the skin
Compound tubular
glands
Branched ducts
Branched tubules
Mucus (glycoprotein
and water)
Brunner glands of
duodenum
Compound acinar
glands
Branched ducts
Branched acini
Watery proteinaceous
fl uid
Lacrimal gland in the
orbit, pancreas, and
mammary glands
Compound
tubuloacinar glands
Branched ducts
Branched tubules and
acini
Watery proteinaceous
fl uid and mucus
(glycoprotein and
water)
Submandibular and
sublingual glands in the
oral cavity
TABLE 3-3
Glands ClassiF ed by Morphology
Epithelial Lining of the Duct System of Exocrine Glands
Secretory acini
Large intralobular duct
Interlobular duct
Lobar duct
Main duct
(simple, low, cuboidal, epithelium)
(Serous, mucous, or mixed cells)
(simple cuboidal to columnar epithelium)
(in salivary gland, includes
striated duct
)
(stratified cuboidal to columnar epithelium)
(stratified columnar epithelium)
Small intralobular duct
(
intercalated duct
)
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