The arch of the foot is composed of the heel bone, tarsal bone, metatarsal bone with the help of ligaments, etc. It is divided into the medial longitudinal arch, lateral longitudinal arch, and transverse arch of the foot. 1. Medial longitudinal arch: The medial longitudinal arch is composed of the heel bone, talus, navicular bone and 3 cuneiform bones, as well as the 1st, 2nd and 3rd metatarsal bones. The medial longitudinal arch is generally dominant and has a higher degree of arch shape and ideal elasticity, so it is also known as the elastic foot arch. The cushioning effect of the medial longitudinal arch is stronger than that of the lateral longitudinal arch, and the lowering of the medial longitudinal arch can lead to the formation of flat feet. 2. Lateral longitudinal arch: The lateral longitudinal arch is also known as the supporting arch, which consists of the heel bone, the dice bone and the 4th and 5th metatarsal bones of the foot. This arch is less elastic than the medial longitudinal arch and mainly plays a role in maintaining body posture. 3. Transverse arch: The transverse arch is located in the forefoot and consists of three cuneiform bones, the dice bone and five metatarsal bones, which are involved in maintaining the stability of the foot.