InSight
T h e l a r g e i n t e s t i n e
F ig u r e 1 4 . 9
THE PLANNER^
The large intestine consists of four regions (cecum, colon, rectum, anal canal). The layers
of the walls of the large intestine are like those of organs elsewhere in the GI tract. The
lumen contains bacteria that have important digestive functions. The mucosa contains ab-
sorptive cells and mucus-secreting cells. The large intestine has several functions, includ-
ing digestion; absorption of ions, vitamins, and water; and elimination of feces.
Transverse colon
Ascending ■
colon
Descending
colon
■ Longitudinal
band of smooth
muscle
(teniae coli)
Rectum
Anal canal
Internal anal
sphincter
(involuntary)
External anal
sphincter
(voluntary)
Anus
Regions of the large intestine
Lumen of large intestine
Mucosa
Submucosa
Muscularis
Serosa
Intestinal gland
Lamina propria
Lymphatic nodule
Openings of
intestinal glands
Absorptive cell
Goblet cell
Layers and cells of the large intestine
Let's Journey Through the Digestive System 413
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