These particular tendons allow you to straighten your fingers and thumb and can be injured by a simple cut or jammed finger. Extensor digitorum communis tendons straighten the index middle ring and small fingers.
245 Dorsal Extensor Tendons Of The Hand And The Fingers
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Extensor tendon hand anatomy. 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. A common muscle belly is shared by all the fingers. Extensor tendons are just under the skin.
At the level of the mcp joint the extensor digitorum tendon is joined by the sagittal bands one of the main components of the extensor hood. Extensor denotes their action which is to extend or open flat joints in the hand. 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.
Each tunnel is lined internally by a synovial sheath and separated from one another by fibrous septa. 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. The 6 extensor compartments of the wrist and intrinsic muscles of the hand comprise 23 musculotendinous units.
Extrinsic denotes their location outside the hand. The extensor tendon compartments of the wrist are six tunnels which transmit the long extensor tendons from the forearm into the hand. Zone ii disruption of tendon over middle phalanx or proximal phalanx of thumb epl zone iii.
If not treated it may be hard to straighten one or more joints. The tendons travel down the forearm through a tough band of tissue on top of the wrist. They are located on the posterior aspect of the wrist.
Zones of extensor tendon injuries. The extensor tendon system of the wrist hand and fingers is more complex than the flexor tendon system. Thank you for rating.
The sagittal bands attach volarly to the palmar plate of the mcp joint and dorsally to the extensor tendon. Extensor tendons are thin tendons located on the back of the hand just under the skin. Anatomy the extensor mechanism is one of the most complex structures in the hand 5a.
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. They lie next to the bone on the back of the hands and fingers and straighten the wrist fingers and thumb figure 1. Extensor tendon injuries and tenosynovitis represent clinical situations in which knowledge of this anatomy is use.
The band of tissue or retinaculum holds the tendons in place but allows them to slide up and down the arm.
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