tars/o is a combining form that refers to “tarsals (ankle bones)”.
The tarsal bones are composed of seven short bones found in the proximal (closer to the center of the body) region of the foot. These bones give structural support to the foot’s soft tissues, allowing the feet to bear the body’s weight. Combining with other foot bones the tarsal bones make up a longitudinal arch to provide a stable base of support during standing or walking.
