Page 73 - ASOP ROT Study Guide

12.2 Bones and Joints
The bones and joints which make up the hand and fingers are shown in Figure 36.

http://www.oustormcrowd.com/knowing-the-details-of-human-anatomy-
hand/human-hand-bones-anatomy/

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12 . 3 Tendons

The tendons which control the movements of the fingers arise from muscles found in the forearm.
There are also short muscles in the hand sited in the thenar and hypothenar eminences. These
are the bulky mounds of muscle situated in the palm at the base of the thumb and along the fifth
metacarpal. Short muscles also found between the metacarpal bones are called the intrinsic
muscles of the hand and they control fine movement of the digits. The muscles arising in the
forearm are called the extrinsic muscles of the hand.
Flexor muscles - the tendons of the long flexor muscles enter the hand on its anterior surface by
running together across the wrist through the "carpal tunnel". Two tendons run to each ringer but
one flexor tendon goes to the thumb.
Extensor muscles - on the back of the hand the tendons of the extensor muscles reach the hand
under a strap of tissue binding them to the back of the wrist. There is an extensor tendon to each
of the fingers and two to the thumb.

12 . 4 Thumb
If you had to think of a quotation for something the thumb might say it would have to be "Without me
you can do nothing". This vital digit gives the hand its great powers of fine control and its ability to
pick up small objects or to grasp large things strongly.