The mucosa is
deeply folded
forming pits
that secrete
juices.
The mucosa is
folded to allow
expansion.
The mucosa has
The function of glandular cells
this region is
that secrete
absorption.
alkali and
mucus.
The epithelial
cells have
digestive
enzymes
embedded in
their
membranes.
The function of
this region is
the mixing and
temporary
storage of a
meal.
The inner
epithelium has
many layers,
with new cells
pushing up
from below.
Glandular cells
secrete
protease, mucus
and
hydrochloric
acid.
Glandular cells Epithelium cells The muscularis
are at the base have microvilli. externa has two
of tubes called This is called a layers to carry
crypts.
brush border.
out peristalsis.
The muscularis
externa is three
layers thick.
The submucosa
is elastic.
The submucosa
has many nerve
cells to control
the production
of secretions.
The function of
this region is
transport.
Glands
penetrate into
the mucosa.
The mucosa has
a rich network
of blood
capillaries and
lymphatic
capillaries.
The inner
epithelium is
columnar.
Mucus
The wall is
secreting gland highly folded. It
cells in the
is made up of
epithelium
many
lubricate the
projections
food.
called villi.
There is a lot of
The function of
The mucosa is a
mucus to
this region is
lot thicker than
protect the
chiefly
the submucosa epithelium from
digestion.
digestion.
The muscle
layer is one of
the thickest
layers.