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Laboratory 13. Gluteal Region
Step 4. Piriformis Muscle and Relationship of Gluteal Nerves and Vessels

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Now, identify the piriformis muscle as it passes through the greater sciatic foramen (Figure 13.3). This muscle serves as an important landmark for the identification of other structures in the gluteal region. The superior gluteal artery and vein emerge from the greater sciatic foramen above the superior border of the piriformis muscle. The inferior gluteal artery, vein, and nerve cross the inferior border of the piriformis muscle.

Note that the superior gluteal nerve lies deep to the gluteus medius muscle and cannot be seen at this time. The superior gluteal nerve will be identified when the gluteus medius muscle is reflected.

Links and References:
Grant's: 5.33 and 5.36
Netter (1ed.): 465 (2ed.): 461
Rohen/Yokochi: 428, 430, and 453