The ability to flex the fingers consists of a system of flexor muscles in the forearm and their tendons are inserted into the bones of the fingers. Zone ii disruption of tendon over middle phalanx or proximal phalanx of thumb epl zone iii.
The 6 extensor compartments of the wrist and intrinsic muscles of the hand comprise 23 musculotendinous units.
Extensor tendon anatomy hand. Zones of extensor tendon injuries. They can be injured by a minor cut or jamming a finger which may cause the thin tendons to rip from their attachment to bone. Zone i disruption of terminal extensor tendon distal to or at the dip joint of the fingers and ip joint of the thumb epl mallet finger.
Ten years later he described the process of attritional rupture of the digital extensor tendons in the rheumatoid hand with which his name has become associated. Extensor tendons are just under the skin. A flexor tendon injury can cause loss of flexion.
These particular tendons allow you to straighten your fingers and thumb and can be injured by a simple cut or jammed finger. Each tunnel is lined internally by a synovial sheath and separated from one another by fibrous septa. If not treated it may be hard to straighten one or more joints.
Please vote below and help us build the most advanced adaptive learning platform in medicine. Extensor denotes their action which is to extend or open flat joints in the hand. Extensor tendons are thin tendons located on the back of the hand just under the skin.
Extrinsic denotes their location outside the hand. Rheumatoid arthritis ra is the most common underlying etiology of tendon rupture in the hand and wrist. They lie next to the bone on the back of the hands and fingers and straighten the wrist fingers and thumb figure 1.
The extensor tendon compartments of the wrist are six tunnels which transmit the long extensor tendons from the forearm into the hand. Extensor tendon injuries and tenosynovitis represent clinical situations in which knowledge of this anatomy is use. Thank you for rating.
The extrinsic extensor muscles of the hand are located in the back of the forearm and have long tendons connecting them to bones in the hand where they exert their action. Understanding of and familiarity with the extensor anatomy of the hand and fingers by the radiologist is crucial for better assessment of pathologic conditions with mr imaging and optimization of this mo dality as a diagnostic tool. They are located on the posterior aspect of the wrist.
The extensor tendon system of the wrist hand and fingers is more complex than the flexor tendon system.
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