Inversion (kinesiology)
Encyclopedia
Inversion is the movement of the sole
Sole (foot)
The sole is the bottom of the foot.In humans the sole of the foot is anatomically referred to as the plantar aspect. The equivalent surface in ungulates is the hoof.- Human sole :...

 towards the median plane
Median plane
The median plane is a Midsagittal plane which bisects the body vertically through the navel, dividing the body exactly in left and right side.Sagittal plane is any plane parallel to the median plane....

 (as when an ankle is twisted).

Tibialis anterior and tibialis posterior invert. Some sources also state that the triceps surae
Triceps surae
The triceps surae is a pair of muscles located at the calf - the gastrocnemius and the soleus...

 and extensor hallucis longus invert.

It occurs at the subtalar joint
Subtalar joint
In human anatomy, the subtalar joint, also known as thetalocalcaneal joint, is a joint of the foot. It occurs at the meeting point of the talus and the calcaneus.-Motion:...

 and transverse tarsal joint
Transverse tarsal joint
The transverse tarsal joint or midtarsal joint is formed by the articulation of the calcaneus with the cuboid, and the articulation of the talus with the navicular....

.

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