The brain sends messages through the nerves telling the muscles on the forearm and hand how and when to maneuver. Every single phalanx has two centers of ossification, the 1st 1 for the body or shaft, and the next for The bottom or proximal extremity. The shaft begins to ossify https://www.theorthopaedicandpainpractice.com/what-are-the-different-bones-found-in-my-hand/