Ben's arm in close up form. Reading the notes, from the top, clockwise:
1. Keypad for "mental" shutdown
2. Shoulder attachment Joint
3. "Nerve ports" (mental control)
4."muscle cable" for smooth joint movement (this is also on the finger joints and wrist joint)
5. Materia plasma conduit (There are several of these, and they glow a very faint green)
6. Fully operational hand
7. Main Transformation Panels (MTP, for reference in the transformation section of the bigger picture)