The wrist links the hand to the arm. The wrist is a complex mechanical system of 8 small bones known as the carpal bones. The carpal bones are arranged in 2 interrelated rows. One row connects with the ends of the bones in the forearm— radius and ulna.
Did you know that there are 27 bones in the hand and wrist? The hand is a very complex anatomical structure. The finger bones, as shown in the figure above, are:. The thumb mimics the other fingers but does not have a middle phalanx.
They are all similar in shape and have joints in the wrist on one end, and the finger at the other end. The index and middle finger metacarpals have very little motion, while the metacarpals of the ring and little finger move much more. The proximal phalanx of the fingers is the proximal, or first bone, in the fingers when counting from the hand to the tip of the finger.
Bones have many shapes and sizes and are important to add structure to the body and protection to the vital structures. The bones have a crystalline construction embedded with mineral and live cells that maintain and repair the skeleton. It, essentially, floats off of the back of the chest, as it is connected to the body primarily by muscle. In fact, there are 17 muscles that attach to the scapula. The scapula has a joint that wraps around from the back to the front of the shoulder called the acromion.