Arms and trunk are controlled before hands and fingers. This is:

1. The proximodistal principle says development proceeds from the centre of the body outward. 2. The spinal cord develops before the outer parts; the arms develop before the hands, and the hands before the fingers. 3. Cephalocaudal is head to foot. _Source: Virginia Cooperative Extension Publication 350-053, Human Growth and Development: A Matter of Principles (Ruffin), "Principles of Development"_