: Why shin and forearms bones are both in 2 parts ?

Question

: Why shin and forearms bones are both in 2 parts ?

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Answer 1

So we can move. Otherwise we would be stiffer.

I’ll explain further; the purpose is the ability to rotate the hand or foot, though the human foot is not terribly mobile in terms of rotation per se.

Also, different muscles are attached to the different bones to produce different movements.

The two bones are not fixed together, they are connected via ligaments and can move in relation to each other.

The ulna and radius (forearm) actually completely cross over one another when you rotate the hand (palm up, palm down). Your wrist doesn’t rotate, it’s all in the forearm. Rotate your hand. See what moves.

Thats why it is two bones. And not one big stiff one.