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Gemelli and obturator internus muscles: Different heads of one muscle?

Background: The superior gemellus, inferior gemellus, and obturator internus muscles were once regarded as a single muscle judging from their insertion and function. However, current textbooks of anatomy do not treat them as one muscle. In gross anatomy, the classification of muscles depends largely upon the nerve supply, so that the present author re‐examined the nerve supply to the three muscles.