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part of the gastrointestinal tract
following the stomach and
followed by the large intestine
 where much of the digestion and
absorption of food takes place

 average length of the small
intestine
 in an adults- 6.9 m

It is approximately 2.5–3 cm in
diameter.

It is structurally divided into
three parts:
› duodenum
› jejunum
› ileum

.
The duodenum is a short structure
(about 20–25 cm long)
continuous with the stomach and
shaped like a "C".
 It surrounds the head of the
pancreas.

It receives gastric chyme from
the stomach, together with
digestive juices from the
pancreas (digestive enzymes)
and the gall bladder

Structure exhibits fingerlike or
leaflike villi
The duodenum contains Brunner's
glands, which produce a mucus-rich
alkaline secretion containing
bicarbonate.

The jejunum is the midsection
of the small intestine,
connecting the duodenum to the
ileum.

It is about 2.5 m long, and contains
the plicae circularis, and villi that
increase its surface area.
Products of digestion (sugars,amino
acids, and fatty acids) are
absorbed into the bloodstream
here

The ileum: The final section of the small
intestine. It is about 3 m long, and contains
villi similar to the jejunum.
It absorbs mainly vitamin B12 and bile
acids, as well as any other remaining
nutrients.
.

 The ileum joins to the cecum of
the large intestine at the
ileocecal junction

 Contains Peyers patches(aggregation of
lymphocytes)

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Small intestines.pptx

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Small intestines.pptx