The small muscles of the foot
Intrinsic muscles of the foot
Layers of short muscles in the sole that shape the arch and spread the toes.
What it does
The sole contains four layers of short muscles that start and end within the foot. They flex and spread the toes, and together they act as a living support for the arches, adjusting to uneven ground with every step.
Surprising fact
Running barefoot or in very flexible shoes makes these small muscles work harder, and studies suggest they grow stronger as a result.
Why it matters
Weak foot muscles are linked to flat feet and plantar heel pain. Simple exercises like picking up a towel with your toes help strengthen them.
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Sources
Drafted with AI help; awaiting a human fact-check against these sources.
Open in the 3D atlas · Suggest a correction · Not medical advice.
3D models: Z-Anatomy & BodyParts3D (CC BY-SA 4.0 / 2.1 JP). Card text CC BY 4.0.