Normal foot, Flat feet, Arching foot model

Normal foot: The center mainly distributes in three parts, back, front and the outer edge, they make up of the longitudinal arch to avoid part of the foot touching ground.
Flatfoot: It is a malformation caused by losing longitudinal arch because of flat instep bone and arch bone, the foot looks flat on ground.
Arching foot: It is a malformation caused by too high of longitudinal arch, and make the foot become bent.
These three models can help students understand the structures and difference among the three kinds of foot.