von Schroeder H P, Botte M J
Division of Orthopaedic Surgery, Toronto Western Hospital, University of Toronto, Ontario, Canada.
Clin Orthop Relat Res. 2001 Feb(383):74-83. doi: 10.1097/00003086-200102000-00010.
Intrinsic and extrinsic hand muscles power finger extension. These two muscle groups have different anatomy that allows complimentary function at the interphalangeal joints and opposing function at the metacarpophalangeal joints. Independent extension of each finger is not possible because of anatomic constraints including the juncturae tendinum and intertendinous fascia between the extrinsic extensor tendons on the dorsum of the hand. Anatomic variations of the extrinsic extensor tendons are frequent and knowledge is important when assessing the traumatized or diseased hand.
手部的内在肌和外在肌为手指伸展提供动力。这两组肌肉的解剖结构不同，使得它们在指间关节发挥互补功能，而在掌指关节发挥相反功能。由于包括手背外在伸肌腱之间的腱间结合和腱间筋膜等解剖学限制，每个手指无法独立伸展。外在伸肌腱的解剖变异很常见，在评估受伤或患病的手部时了解这些知识很重要。
