INVESTIGATION OF THE CHANGES
THAT OCCUR IN THE MUCOSAL
LINING ALONG THE ALIMENTARY
CANAL
BY: KIERRA HATCHER
THE MOUTH
Food enters the digestive system through
the mouth. Food is then broken down into
smaller pieces by chewing. Then teeth cut
and crush the food, while it’s being mixed
with saliva. This process helps to make it
soft and easier to swallow. It then makes
its way down the Esophagus.
Epithelial Cells from the human mouth
THE ESOPAHGUS
•The esophagus is the narrowest
part of the alimentary canal.
The alimentary canal is a single
continuous tube. The wall of the
esophagus consists of four
layers: mucosa, submucosa, musc
ularis propria, and adventitia.
Unlike other areas of the GI tract,
the esophagus does not have a
distinct serosal covering. This
allows esophageal tumors to
spread more easily and makes
them harder to treat surgically.
From the esophagus we lead
down to the stomach.
Tissue from the Esophagus. That
purple is so pretty!
THE STOMACH
•The stomach and intestines
have a thin simple
columnar epithelial layer
for secretion and
absorption. The
submucosa is a thick layer of
loose connective tissue that
surrounds the mucosa. This
layer also contains blood
vessels, lymphatic vessels,
and nerves. Glands may be
embedded in this layer. We
then get to the duodenum.
This is stomach tissue. Look at that pattern!
THE JEJUNUM
•The jejunum is one of three sections
that make up the small intestine.
The small intestine is part of
the digestive system and is vital for
breaking down and absorbing nutrients.
It extends from the pyloric sphincter of
the stomach to the ileocecal valve that
connects the small intestine to the large
intestine. Next comes the Ileum.
This is a crypt found in the Jejunum!
THE ILEUM
•The ileum is the final section
of the small intestine. The
function of the ileum is mainly
to absorb vitamin B12, bile
salts, and any products of
digestion that were not
absorbed by the jejunum. The
wall itself is made up of folds,
each of which has many tiny
finger-like projections known
as villi on its surface. Now we
are to the Colon!
Tissue from the Ileum. Looks like a worm! Isn’t
that cool?
THE COLON
•The large intestine also called
the colon, consists of the
cecum, rectum, and
anal canal. It also includes the
appendix, which is attached to
the cecum. The colon is
further divided into: Cecum
(first portion of the colon) and
appendix. Last but not least,
the Anus.
This is tissue from the Colon. I think this one is so cool! The
colors are incredible.
THE ANUS
•The alimentary canal is the long
tube of organs — including
the esophagus, stomach,
and intestines — that runs from
the mouth to the anus. An
adult's digestive tract is about 30
feet (about 9 meters) long.
Digestion begins in the mouth,
well before food reaches the
stomach.
This is tissue from the Anus! I didn’t expect for it to look like
this!
THE END
THANK YOU FOR VIEWING MY PRESENTATION.