What movement does inversion refer to?

Inversion specifically refers to the movement of the ankle where the plantar surface of the foot turns medially, or inward, towards the midline of the body. This action brings the inside of the foot toward the other foot, raising the arch and decreasing the angle between the foot and the leg. It is a common term used in anatomy and kinesiology when describing how the foot functions during various activities such as walking, running, or balancing.

Understanding this movement is crucial for recognizing how the foot interacts with the ground and facilitates stability. Inversion is also significant in the context of certain injuries, as excessive inversion can lead to ankle sprains or strains. The other options describe different movements that do not accurately capture the definition of inversion. For instance, turning the ankle so the plantar surface faces laterally refers to eversion, whereas moving the foot in a circular direction pertains to circumduction. Lifting the heel upward is an action related to dorsiflexion, which involves raising the toes upwards toward the shin.