Lumen of small intestine
Villi
Goblet ce ll
------------
Lacteal
-----------------
Lamina propria-------
Enteroendocrine cell
Paneth cell
Lymphatic nodule
Muscularis mucosae
Arteriole
----------
V enule
------------ -
Lymphatic vessel
Circular layer of muscle
Myenteric plexus
Longitudinal layer
of muscle
Three-dimensional view of layers
of the small intestine showing villi
Absorptive cell
---- Mucosa
---- Submucosa
---- Muscularis
Serosa
Mucosa
Submucosa-
Blood
capillary
Lacteal
Intestinal
gland
Arteriole
Venule
Lymphatic
vessel
J — Microvilli
Absorptive cell
(absorbs nutrients)
Goblet cell
(secretes mucus)
Enteroendocrine cell
(secretes the
hormones secretin,
cholecystokinin, or
GIP)
Paneth cell
(secretes lysozyme
and is capable
of phagocytosis)
Enteroendocrine cells
:
S-cells
secrete
secretin
,
which stimulates secretion of
pancreatic juice.
CCK cells
secrete
cholecystokinin (CCK)
,
which stimulates secretion of
pancreatic juice, causes
ejection of bile from
gallbladder, inhibits gastric
emptying, and induces
satiety (a feeling of fullness
or satisfaction).
K
cells
secrete
glucose-dependent
insulinotropic peptide
(GIP),
which stimulates
release of insulin from
pancreatic p cells.
Lysozyme
is an
enzyme that kills
bacteria.
Enlarged villus showing lacteal, capillaries, intestinal glands, and cell types
Let's Journey Through the Digestive System 409
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