This muscle group lies deep in the abdominal cavity, and is too often overlooked.

Trigger points in the iliopsoas frequently contribute to low back pain cases, and often need to be released to effect a complete and lasting resolution of these cases.

The psoas major and iliacus are considered part of the posterior abdominal wall because of their position and cushioning role for the abdominal viscera.

However, based on their action of flexing the hip joint, it would also be relevant to place them with the hip muscles.

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