Final answer:
A child has to control the opposition movement of the thumb for in hand manipulation, which allows grasping and holding objects. The first metacarpal bone's independent freedom of motion and the limited mobility of the fourth and fifth metacarpal bones are crucial for effective grip strength in the palm.
Step-by-step explanation:
For in hand manipulation, the child has to control the opposition movement of the thumb toward the fingers of the same hand, making it possible to grasp and hold objects. This opposition involves the first metacarpal bone, at the base of the thumb, which is separated from the other metacarpal bones to allow a freedom of motion crucial for thumb mobility. The mobility of the fourth and fifth metacarpal bones also plays a role in the hand's gripping actions, which is important for tasks requiring strong contact by the medial hand.
Pronation is a forearm motion that moves the palm of the hand from the palm forward to the palm backward position, which is different from the opposition motion needed for in hand manipulation. Specific muscles and bones work together to assist in bending the hand up toward the shoulder, tilting the hand to the side away from the body, and stabilizing the wrist, which are all important components of manipulating objects with the hand.