There are two long bones in our forearms. One of them is called Ulna and the other is called radius. The form of Ulna is prismatic and it runs parallel to the radius. Radius is shorter and smaller than Ulna. When our arms are down at the body sides and our palms face forward which is called the anatomical position, then Ulna is placed at the side of the forearm which is closest to the body. It is known as Medial side, the side of the little finger. The bone in the leg which is corresponding to the Ulna is known as Fibula

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