The fibrous tissue that surrounds muscle and separates various tissues of the body is called the fascia. The bottom, or plantar, floor of your foot includes a strip of the tough tissue, often called the plantar fascia, stretching from your heel towards the front of the bottom in the foot. https://www.theorthopaedicandpainpractice.com/treating-foot-arch-pain-with-modern-orthopaedic-pain-management-techniques/