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[Extension of the fingers. III. Morphologic and structural study].
J N Kuhlmann1, A Boabighi, J Luboinski
1Laboratoire d'Anatomie de la Pitié-Salpétrière, Paris.
Bulletin De L'Association Des Anatomistes
|September 1, 1992
Summary
The interosseous muscles have two components, and their dorsal aponeurosis includes extensor and lumbrical muscles, forming tendons that attach to finger bones.
Area of Science:
- Anatomy and Biomechanics of the Hand
- Musculoskeletal System Research
- Extensor Tendon System Analysis
Context:
- The hand's intricate structure involves multiple muscle and tendon components.
- Understanding the dorsal aponeurosis is crucial for grasping hand function.
- Previous studies have detailed individual muscle origins but lacked a cohesive view of the dorsal apparatus.
Purpose:
- To elucidate the detailed anatomical composition of the volar and dorsal interosseous muscle fascicles.
- To describe the structural contributions of extensor digitorum and lumbrical muscles to the dorsal aponeurosis.
- To investigate the fixation points of these expansions on the phalanges and the role of associated ligaments.
Summary:
- The volar interosseous muscles have proximal (glenoidal) and distal (aponeurotic) components.
- The dorsal aponeurosis is formed by deep, central, and collateral expansions from extensor digitorum and interosseous muscles, augmented by lumbrical muscles.
- These expansions attach to the bases of the first, second, and third phalanges, forming central and collateral tendons, with synergistic ligaments contributing to the overall structure.
Impact:
- Provides a comprehensive anatomical description of the dorsal extensor apparatus of the hand.
- Offers insights into the biomechanical principles underlying finger extension and hand dexterity.
- Establishes a foundation for further research in hand surgery, rehabilitation, and the study of hand-related pathologies.