As far as I know the plantar fascia is a thickened fibrous aponeurosis that originates from the medial tubercle of the calcaneus. It runs forward to form the longitudinal foot arch and the function of the plantar fascia is to provide static support of the longitudinal arch and dynamic shock absorption. Individuals with low arches or flat feet or high arches are at increased risk for developing plantar fasciitis. I hope this helps!
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