In
Anatomy of the
Digestive System , the is the central of the three divisions of the
Small Intestine and lies between the
Duodenum and the
Ileum . The change from the duodenum to the jejunum is usually defined as the
Ligament Of Treitz .
In adult
Human s, the small intestine is usually between 5.5-6m long, 2.5m of which is the jejunum.
The
PH in the jejunum is usually between 7 and 8 (neutral or slightly
Alkaline ).
The jejunum and the ileum are suspended by
Mesentery which gives the bowel great mobility within the
Abdomen . It also contains muscles to help move the food along.
The inner surface of the jejunum, its
Mucous Membrane , is covered in projections called
Villi , which increase the surface area of tissue available to absorb nutrients from the gut contents. The villi in the jejunum are much longer than in the duodenum or ileum.
The jejunum contains very few
Brunner's Glands (found in the duodenum) or
Peyer's Patches (found in the ileum). Instead, it has many large
Circular Folds in its
Submucosa called plicae circulares which increase the surface area for nutrient absorption.
''Jejunum'' is derived from the adjective ''jejune'', which means "
Fasting " or "hungry" in
Early Modern English .
It was so called because this portion of the intestine was found "empty" following death
jejunus, fasting; barren
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