Extensor Digitorum Brevis (EDB)
Overview
Muscle | Origin | Insertion | Innervation | Action |
---|---|---|---|---|
Extensor digitorum brevis | Calcaneus (lateral dorsal) | Bases of middle phalanx 2-4 | Deep Fibular n. L5 - S1 |
2nd-4th Toe: MTP Extension, PIP Extension |
Origin
Calcaneus (lateral dorsal surface)3
Insertion
Bases of middle phalanges of digits 2-43
According to Brad Jones4, the EDB inserts distally on the lateral aspect of the EDL tendons4.
Nerve
Deep Fibular N. (L5, S1)3
Action
MTP/PIP 2-4: Extension3
MMT
“The EDL and the EDB muscles produce the motion of extension at the MTP and IP joints of the lateral four digits from a flexed position.”5
- Apply resistance dorsal surface of the proximal and distal phalanges into toe flexion5
References
1.
Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details
2.
Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/
3.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.
4.
Jones B. B Project Foundations. b Project; 2025.
5.
Dutton M. Dutton’s Orthopaedic Examination, Evaluation, and Intervention. 5th ed. McGraw Hill Education; 2020.
Citation
For attribution, please cite this work as:
Yomogida N, Kerstein C. Extensor Digitorum
Brevis (EDB). https://yomokerst.com/The
Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Ankle and
Foot/Intrinsic Dorsal Foot
Muscles/extensor_digitorum_brevis.html