Related Experiment Videos
Anatomical and functional study on the musculus semimembranosus
Anatomia Clinica
|January 1, 1984
Summary
The semimembranosus muscle, crucial for knee stability, primarily acts as a brake during outer rotation, especially with the hip flexed and knee extended. Its tibial attachments ensure function across various knee positions.
Area of Science:
- Anatomy
- Biomechanics
- Kinesiology
Background:
- The semimembranosus muscle's precise anatomical attachments and functional role in knee biomechanics require detailed investigation.
- Existing descriptions of semimembranosus muscle attachments are sometimes ambiguous, necessitating clarification.
Purpose of the Study:
- To provide a detailed anatomical description of the semimembranosus muscle and its tibial attachments.
- To elucidate the functional role of the semimembranosus muscle in knee rotation using electromyography.
Main Methods:
- Cadaveric dissection of 18 human knees to meticulously map the semimembranosus muscle's anatomy.
- Electromyography on 17 specimens to assess muscle activity during specific knee and hip positions.
Main Results:
- The semimembranosus muscle demonstrates exclusive tibial attachment via three distinct tendons, ensuring consistent functionality.
- Electromyography revealed the muscle functions predominantly as a restraint against external rotation, particularly when the knee is extended and the hip is flexed.
Conclusions:
- The semimembranosus muscle's primary role is stabilizing the knee against external rotation.
- Accurate anatomical understanding of the semimembranosus muscle is essential for interpreting its biomechanical function.