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. 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.

Metacarpals Approach Dorsal To Base Of 5th Metacarpal

The tendons travel down the forearm through a tough band of tissue on top of the wrist.

Extensor tendon hand anatomy. Anatomy the extensor mechanism is one of the most complex structures in the hand 5a. These particular tendons allow you to straighten your fingers and thumb and can be injured by a simple cut or jammed finger. The extensor tendon system of the wrist hand and fingers is more complex than the flexor tendon system.

Please vote below and help us build the most advanced adaptive learning platform in medicine. Zones of extensor tendon injuries. Extensor tendon injuries and tenosynovitis represent clinical situations in which knowledge of this anatomy is use.

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. Each tunnel is lined internally by a synovial sheath and separated from one another by fibrous septa. A common muscle belly is shared by all the fingers.

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. Extrinsic denotes their location outside the hand. The 6 extensor compartments of the wrist and intrinsic muscles of the hand comprise 23 musculotendinous units.

They lie next to the bone on the back of the hands and fingers and straighten the wrist fingers and thumb figure 1. 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. The sagittal bands attach volarly to the palmar plate of the mcp joint and dorsally to the extensor tendon.

If not treated it may be hard to straighten one or more joints. The band of tissue or retinaculum holds the tendons in place but allows them to slide up and down the arm. They are located on the posterior aspect of the wrist.

Zone ii disruption of tendon over middle phalanx or proximal phalanx of thumb epl zone iii. Extensor digitorum communis tendons straighten the index middle ring and small fingers. Extensor denotes their action which is to extend or open flat joints in the hand.

The extensor tendon compartments of the wrist are six tunnels which transmit the long extensor tendons from the forearm into the hand. Extensor tendons are thin tendons located on the back of the hand just under the skin. Extensor tendons are just under the skin.

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Flexor Tendon Anatomy Flexor Tendon System Flexor Muscles