Mimicking Natures Building Blocks
The human hand has five fingers and 27 bones, not including the sesamoid bone, the number of which varies between people, 14 of which are the phalanges (proximal, intermediate and distal) of the fingers.
The metacarpal bones connect the fingers and the carpal bones of the wrist. Each human hand has five metacarpals and eight carpal bones.
These carpal bones are not part of this study as we deem them to have no function however we will be using the CMC trapezium carpal as a POR (point of rotation) for the thumb metacarpal.
Starting from the inside. We will work our way outward as we build up the profile of the human hand. Using a real 3d scan of the bones in the human hand we have been given the building blocks of which we will replicate into a working model. Some careful examination of each joint has been taken. After looking at how the joints work independently as well as collectively we begin to understand what is happening with in this complex structure.
The heads of the metacarpals will each in turn articulate with the bases of the proximal phalanx of the fingers and thumb. These articulations with the fingers are the metacarpophalangeal joints known as the knuckles. The fourteen phalanges make up the fingers and thumb, and are numbered I-V (thumb to little finger) when the hand is viewed from an anatomical position (palm up). The four fingers each consist of three phalanx bones: proximal, middle, and distal.
The thumb only consists of a proximal and distal phalanx. Together with the phalanges of the fingers and thumb these metacarpal bones form five rays or poly-articulated chains.
First concept prototype of (MCP),(PIP), and (DIP) Joint
