How many arches exist in the foot?

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There are three arches in the foot, not one. They are the medial longitudinal arch, the lateral longitudinal arch, and the transverse arch. The ML goes from heel to hallux (heel to big toe), the LL goes from the heel to the little toe, and the TA goes across the bottom of them. There is just 1 arch in a foot check out this websit to learn more: http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=381&topcategory=Foot