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| | The Hip |
 | | Further, it is critical to understand the lumbar and sacral region, the important nerve roots that enervate the muscles of the lower extremities, and the consequences of subluxation, herniation, and deterioration of the spine from past injury. |
 | | Lying underneath the piriformis, the obturator internus muscle arises at the medial surface of the pubis, and passes the lesser sciatic notch to insert onto the greater trochanter laterally. |
 | | The rectus abdominus is the anterior muscle of the abdominal wall, rising from the middle ribs, passing down the abdomen and narrowing as it insert onto the pubis. |
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