There's a substantial variation to this typical pattern, aside from the very little finger and volar surface in the index finger. A complete of 27 bones represent the basic skeleton of the wrist and hand. The hand is innervated by 3 nerves — the median, ulnar, and radial nerves — https://bsearchblog.com/en/elevate-your-leathercraft-with-our-bag-making-hand-press-and-dies