Which term indicates the instep of the foot (ankle)?

The term indicating the instep of the foot, also known as the ankle, is "tarsal." In human anatomy, "tarsal" refers specifically to the group of bones located in the posterior part of the foot, which includes the ankle region. These bones are essential for providing structure and facilitating movement in the foot. The tarsal bones, which include the talus and calcaneus, play a critical role in weight-bearing and mobility, connecting the foot to the leg.

The other terms listed have distinct anatomical meanings that do not relate to the foot or ankle. For instance, "umbilical" pertains to the navel area, "sternal" relates to the sternum or breastbone, and "vertebral" is associated with the vertebrae in the spine. Understanding these terms helps clarify their specific locations and functions within the body.