Upper limb prostheses or upper extremities. The upper member or upper end, in the human body, is becoming one of the ends fixing to the upper trunk. It consists of four segments: shoulder girdle, arm, forearm and hand and is characterized by their mobility and ability to manipulate and hold.
In formal terms, "arm" refers only to the second segment of the upper limb, and should not be understood at least in anatomic-language as all of it.
girdle It consists of the bones of the clavicle and scapula, two on each side, that secure the upper limbs to the top of the trunk -tórax- shoulder level.
Arm Its skeleton is formed by a single bone, the humerus, the longest and voluminous upper limb bone. The arm is formed in its front face by flexors (biceps brachii, and brachialis Coracobrachialis), which will be supplied by the musculocutaneous nerve. While on its rear face the extensor muscle (Triceps brachii), which is innervated by the radial nerve will be found. There are several models of prostheses for amputees arms
Forearm It consists of the radius and ulna. It is articulated at its proximal portion with the scapula and its distal portion with Ulna (ulna) and the radius.Anteriorly in the flexor muscles were found, while in the rear portion BE extenders. In total the forearm muscles has 20, of which only 17 will cross the elbow joint. Prosthetic arm.
Hand The hand is attached to the forearm by a joint called wrist (whose bones form the carpal bones) and consists of a central palm (whose bones form the metacarpal) from which emerge five fingers (also called phalanges). In addition, the hand is made up of several, muscles and ligaments that allow for a lot of movement and dexterity. Prosthesis hand.