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Evaluation of Muscle Function of the Extensor Digitorum Longus Muscle Ex vivo and Tibialis Anterior Muscle In situ in Mice
Published on: February 9, 2013
The extensor medii proprius and anomalous extensor tendons to the long finger
1Division of Orthopaedics and Rehabilitation, University of California, San Diego.
The extensor medii proprius and extensor indicis et medii communis are anatomical variations of finger extensor tendons. Their presence, though uncommon, is important for accurate surgical identification and repair.
Area of Science:
- Anatomy
- Human Morphology
- Surgical Anatomy
Background:
- The extensor medii proprius (EMP) and extensor indicis et medii communis (EIMC) are variations of extensor tendons.
- These muscles are analogous to the extensor indicis proprius (EIP) but insert into the long finger.
Purpose of the Study:
- To determine the incidence and anatomical characteristics of the EMP and EIMC.
- To highlight the clinical relevance of these variations in hand surgery.
Main Methods:
- Dissection of extensor tendons in 58 adult hands.
- Documentation of the origin, insertion, and variations of EMP and EIMC.
Main Results:
- The incidence of EMP was 10.3% and EIMC was 3.4%.
- Both variations shared a common origin with the EIP.
- Specific insertion patterns into the dorsal aponeurosis or deep fibrous tissue were observed.
Conclusions:
- EMP and EIMC may be evolutionary remnants.
- Awareness of these anatomical variations is crucial for precise extensor tendon identification, repair, and transfer in surgical procedures.
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