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Extensor pollicis et indicis communis or extensor indicis radialis muscle
Daniel Casanova Martínez1, Iván Valdivia Gandur, Pau Golanó
1Anatomy Unit, Biomedical Department, University of Antofagasta, Av. Universidad de Antofagasta s/n (Campus Coloso), 1240000 Antofagasta, Chile. dcasanova@uantof.cl
Anatomical variations in finger extensor tendons are common. A rare accessory tendon connected by fascia to the extensor pollicis longus suggests a unique functional muscle variant.
Area of Science:
- Anatomy
- Morphology
- Human Anatomy
Background:
- Anatomical variations of finger extensor tendons are frequently documented.
- Intertendinous fascial bands can significantly alter muscle function but are rarely described.
Observation:
- A case report details an accessory tendon situated between the extensor digitorum communis tendon (index finger) and the extensor pollicis longus tendon.
- Anatomical analysis revealed fascial connections between the accessory tendon's radial portion and the extensor pollicis longus tendon's ulnar portion.
Findings:
- The accessory tendon aligns anatomically with the extensor indicis radialis.
- Observed fascial connections suggest a functional behavior akin to an extensor pollicis et indicis communis.
Implications:
- Fascial contributions are crucial for accurately classifying morphofunctional muscle variations.
- This finding highlights the importance of considering fascial anatomy in tendon variations.
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