Jejunum
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The intestinal segment between the duodenum and ileum is the jejunum. It is the middle section of the small intestine and plays a key role in nutrient absorption.
There are 3 parts to the small intestine: the duodenum, jejunum and ilium(in that order after the stomach). The duodenum is the first part of the small intestines. It is relatively short (12 inches) and starts at the pyloric sphincter of the stomach, and connects it to the jejunum.
The ilium is one of the three bones that make up the hip bone, while the iliac crest is a prominent ridge at the top of the ilium. The iliac crest serves as an attachment site for muscles and ligaments, and can be felt on the side of the hip.
The ilium serves as the attachment site for the lateral muscles of the abdominal wall and the back of the pelvis,giving form to the interior part of the torso,and protecting its contents :$
The ilium is the largest of the three bones that make up the hip bone. It is located on the uppermost and largest part of the pelvis. The ilium plays a key role in supporting the weight of the body and providing attachment points for muscles.
The ischium is part of the hip bone, along with the ilium and pubis. Together, these three bones form the pelvis.