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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. Extrinsic denotes their location outside the hand. Extensor denotes their action which is to extend, or open flat, joints in the hand.
Extensor pollicis longus extends the terminal phalanx of the thumb. While abductor pollicis brevis and adductor pollicis, both attached to the extensor pollicis longus tendon, can extend the thumb's interphalangeal joint to the neutral position, only extensor pollicis longus can achieve full hyperextension at the interphalangeal joint.
Passing through the first tendon compartment, it inserts to the base of the first metacarpal bone. A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis. Except for abducting the hand, it flexes the hand towards the palm and abducts it radially.
The primary function of the extensors is to straighten out the digits. The thumb has two extensors in the forearm; the tendons of these form the anatomical snuff box. Also, the index finger and the little finger have an extra extensor, used, for instance, for pointing. The extensors are situated within 6 separate compartments.
A mallet finger, also known as hammer finger or PLF finger or Hannan finger, is an extensor tendon injury at the farthest away finger joint. [2] This results in the inability to extend the finger tip without pushing it. [3] There is generally pain and bruising at the back side of the farthest away finger joint. [3]
In medicine a Busch fracture [1] is a type of fracture of the base of the distal phalanx of the fingers, produced by the removal of the bone insertion of the extensor tendon. Without the appropriate treatment, the finger becomes a hammer finger. It would correspond to the group B of the Albertoni classification. [2]
Extensor carpi radialis brevis tendon. Extension of wrist Intersection syndrome: 3 Extensor pollicis longus tendon: Separated from the third compartment by Lister's tubercle. Forms ulnar (little finger side) border of the anatomical snuff box Extension of interphalangeal joint of thumb Drummer's wrist: 4 Extensor digitorum tendons. Extensor ...
Inflamed tendons of the hand. Tendinitis is disorder when tendons of the hands become inflamed. Tendons are thick fibrous cords that attach small muscles of the hand to bones. A Tendon is useful for generation of power to bend or extend the finger. When repetitive action is performed, tendons often get inflamed and present with pain and ...
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