The affected leg usually has one foot that is in an approximately normal position. The extra foot is composed of at least some metatarsal or tarsal bones and extra digits, though it is usually not complete. The feet can be joined together, so that the limb appears to have one large foot, or the extra foot can be joined to the limb separately, usually above the level of the other foot.<unk>  affects one or both of the hind limbs.
Diplopodia
Axon hillock
Lines of Zahn
Cradle cap
Ossification center
Intramedullary rod
Epiphyseal plate
Cramp-ring