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FIGURE 5.6. The piriformis muscle and the anatomic variations of its relationship to the sciatic nerve. (A) Ninety percent, the undivided sciatic nerve passes inferior to the piriformis muscle. (B) Seven percent, the divided sciatic nerve passes through and inferior the piriformis muscle. (C) Two percent, the divided sciatic nerve passes superior and inferior to the piriformis muscle. (Adapted with permission from Beaton and Anson.47)

FIGURE 5.6. The piriformis muscle and the anatomic variations of its relationship to the sciatic nerve. (A) Ninety percent, the undivided sciatic nerve passes inferior to the piriformis muscle. (B) Seven percent, the divided sciatic nerve passes through and inferior the piriformis muscle. (C) Two percent, the divided sciatic nerve passes superior and inferior to the piriformis muscle. (Adapted with permission from Beaton and Anson.47)

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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