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Grooved Surface of the Obturator Internus Muscle With Two Distinct Adjacent Parts
Satoru Muro1, Junichi Tsuchiya2, Takuya Ibara3
1Department of Clinical Anatomy, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, Japan.
Clinical Anatomy (New York, N.Y.)
|January 26, 2026
Summary
This study details the bipartite structure of the obturator internus muscle
Area of Science:
- Anatomy
- Musculoskeletal System
- Pelvic Anatomy
Background:
- The medial surface of the obturator internus muscle is not well-understood.
- Detailed anatomical characterization is needed for clinical applications.
Purpose of the Study:
- To investigate the morphology of the obturator internus muscle's medial surface.
- To identify potential age-related changes in this anatomical region.
Main Methods:
- Dissection of anatomical specimens.
- In vivo pelvic magnetic resonance imaging (MRI) analysis of 27 women (aged 25-83 years).
Main Results:
- A consistent groove-like structure was identified on the medial surface, dividing the muscle into superior and inferior portions with distinct fiber orientations.
- This groove was consistently visible on MRI.
- No statistically significant age-related changes were found in groove location or depth.
Conclusions:
- The obturator internus exhibits a consistent bipartite architecture on its medial surface.
- This detailed anatomical characterization provides a reference for hip-pelvic interface investigations.
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