Variations and Anatomy of Extensor Tendons in the Human Hand
Summary
The extensor apparatus of the human hand comprises a network of tendons that arise from forearm musculature and traverse the dorsal wrist to insert on the digits and thumb. While the extensor digitorum communis forms the principal tendons for the four medial digits, subsidiary muscles such as the extensor indicis proprius and extensor digiti minimi provide independent movement for the index and little finger. Variations are frequent and include accessory slips, supernumerary muscles and atypical juncturae tendinum, which interlink adjacent tendons. Such anomalies often remain asymptomatic but may alter tendon glide, predispose to dorsal wrist impingement or influence outcomes in reconstructive surgery. Embryological studies suggest that these variations arise from incomplete separation of extensor muscle masses, and their prevalence varies widely between populations. Recognition of variant anatomy is crucial for accurate interpretation of imaging, for planning tendon transfers and grafts, and for minimising iatrogenic injury during surgical approaches. Recent advances in high-resolution ultrasound and intraoperative electromyography have improved detection of these anomalies, enhancing both diagnostic confidence and surgical precision.
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Variations and Anatomy of Extensor Tendons in the Human Hand publication trend
The graph below shows the total number of articles in variations and anatomy of extensor tendons in the human hand across all publications each year (not limited to Nature Index journals).
Technical terms
Extensor compartments: fibro-osseous tunnels on the dorsal wrist that guide and stabilise extensor tendons.
Juncturae tendinum: fibrous interconnections linking adjacent extensor tendons, modulating coordinated finger extension.
Accessory slip: an additional tendon branch arising from a primary extensor muscle, potentially altering tendon biomechanics.
Extensor retinaculum: a thick fascial band over the dorsum of the wrist that restrains extensor tendons and maintains their course.
References
- Importance of Anatomic Peculiarities and Ultrasound-Guided Electromyography of the Extensor Indicis Proprius Muscle. Cureus (2021).
- Anomalous Extensor Digiti Minimi with Multiple Slips and Bulbous Appearance. Journal of Hand Surgery Global Online (2023).
- Presumed Presence of Extensor Indicis et Digiti Medii Communis Muscle in a 70-Year-Old White Male Donor. Anatomia (2023).
- Insights with consensus on Abductor Pollicis Longus from the Central Indian population at Nagpur, Maharashtra. Bioinformation (2023).
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