Plantar surface
Instep is incorrect. According to dictionary.com instep = "the arched upper surface of the human foot between the toes and the ankle"
the keystone is the most important part of an arched bridge. :]
It is the part of your foot just behind your toes, before the arch and heel. In most dance styles, you dance primarily on this part of the foot, and rarely on your heels. When dancing "on the balls of your feet", it means to dance with your feet arched as if you are in high heels.
The instep is the arched middle part of the top of the foot, located between the toes and the ankle. It is made up of the tarsal and metatarsal bones, tendons, ligaments, and blood vessels. The instep provides support and stability to the foot during walking and running.
It depends on your personal foot shape. If you have high arched feet, which you will be able to notice from looking at them, then it is certainly more advised you buy a high arched shoe to accommodate.
The soft triangular part of a pony's foot is called the frog. It acts as a shock absorber and helps with circulation in the hoof.
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A basic part of a meter in poetry that consists of two syllables is called a foot. A foot with three syllables is called a trimeter.
It has a common name: the ball.
Toe
It has a common name: the ball.
Arched!