Chapter 4
Tissue: The Living Fabric
121
4
(b)
Simple cuboidal epithelium
Description:
Single layer of cubelike cells
with large, spherical central nuclei.
Function:
Secretion and absorption.
Location:
Kidney tubules; ducts and secretory
portions of small glands; ovary surface.
Photomicrograph:
Simple cuboidal epithelium
in kidney tubules (430
m
).
Basement
membrane
Nucleus
Connective
tissue
Simple
cuboidal
epithelial
cells
(c)
Simple columnar epithelium
Description:
Single layer of tall cells with
round
to
oval
nuclei; some cells bear cilia;
layer may contain mucus-secreting
unicellular glands (goblet cells).
Function:
Absorption; secretion of mucus,
enzymes, and other substances; ciliated type
propels mucus (or reproductive cells) by
ciliary action.
Location:
Nonciliated type lines most of the
digestive tract (stomach to rectum),
gallbladder, and excretory ducts of some
glands; ciliated variety lines small bronchi,
uterine tubes, and some regions of the uterus.
Photomicrograph:
Simple columnar epithelium
of the small intestine mucosa (660
m
).
Simple
columnar
epithelial
cell
Basement
membrane
Mucus of
goblet cell
Microvilli
Figure 4.3
(continued)
(b)
and
(c)
Simple epithelium. (For related images, see
A Brief Atlas of
the Human Body
, Plates 3, 4, and 5.)
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