< b>Ileum: The lowest part of the small intestine, located beyond the duodenum
and jejunum, just before the large intestine (the colon). Pronounced "il-eum" in
the US and "eye-leum" in the UK.
The word "ileum" is derived from the Greek "eileos" meaning "twisted." This is
apt because, when the small intestine is viewed at surgery or at autopsy (or exposed
from a wound), it looks twisted. It is also apt because, when the small intestine
is obstructed, the ileum is most often the site of the twist or whatever is causing
the obstruction.
The ileum is not to be confused with the ilium, the upper part of the pelvis
which forms the receptacle for the head of the femur at the hip joint.
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