What’s the difference between extrinsic and intrinsic foot muscles?
Extrinsic foot muscles (EFM): These start in your lower leg and control the big, powerful movements of your foot and ankle like pointing your toes, lifting your foot, or turning it inward/outward. They’re your foot’s “power muscles.”
Intrinsic foot muscles (IFM): These tiny muscles are entirely inside the foot. They stabilise your arches, control your toes, and help absorb shock and maintain balance. Think of them as your foot’s “control muscles."
How many muscles are in your foot?
- Extrinsic muscles: 10
- Intrinsic muscles: 19
The intrinsic and extrinsic muscles are considered to stabilize the foot and contribute to propulsion during walking
— Akuzawa, H., Morito, T., Oshikawa, T., Kumai, T., & Kaneoka, K. (2023). —
Which foot muscles are most important?
All foot muscles play a role and work together to keep your foot functioning efficiently. The larger extrinsic foot muscles provide power for movement, while the intrinsic foot muscles help with control, stability, and shock absorption.
Key extrinsic muscles (the “power” muscles):
- Gastrocnemius & soleus: Generate push-off force by plantarflexing the ankle.
- Tibialis anterior: Lifts the foot and contributes to inversion for stability during walking and running.
- Peroneals: Evert the foot and help stabilise the ankle, especially on uneven surfaces.
Key intrinsic muscles (the “control” muscles):
- Adductor hallucis: Supports the big toe and maintains the transverse arch.
- Abductor hallucis: Helps stabilise the medial arch and controls big-toe movement.
- Flexor digitorum brevis: Assists with toe flexion and contributes to shock absorption and arch support.
- Flexor digiti minimi brevis: Controls and flexes the little toe for lateral stability.
Stronger, more balanced foot muscles improve performance, reduce injury risk, and help your feet absorb impact more effectively. Training both the big movers and the small stabilisers ensures your feet can cope with daily demands and sport-specific forces safely and efficiently.
Why should we care about foot muscles?
References
1. Akuzawa, H., Morito, T., Oshikawa, T., Kumai, T., & Kaneoka, K. (2023). Functional relationship between the foot intrinsic and extrinsic muscles in walking. Journal of Electromyography and Kinesiology, 71, 102781. doi:10.1016/j.jelekin.2023.102781