第三骨间掌侧肌及其肌支的解剖观察

Anatomical study of the third palmar interosseous muscle and its dominate nerve

目的观察第三骨间掌侧肌及其肌支的解剖学特点,探讨腕尺管综合征中小指内收恢复困难的解剖学基础。方法在2.5倍手术放大镜下对20具新鲜无外伤、无畸形成人手标本进行解剖,观察第三骨间掌侧肌及其肌支及邻近结构,测量了第三骨间掌侧肌的大小和第三骨间掌侧肌支的长度、宽度、厚度.并对所得数据进行统计学处理。结果第三骨间掌侧肌及第三骨间掌侧肌支分别是骨间掌侧肌和骨间掌侧肌支中最细小的,部分第三骨间掌侧肌浅层存在明显的腱束,对第三骨间掌侧肌支形成潜在的卡压。结论第三骨间掌侧肌及其肌支是骨问掌侧肌和肌支中最细小的,部分由第三骨间掌侧肌桡侧绕至尺侧入肌,而第三骨间掌侧肌掌侧存在明显的腱束,对第三骨间掌侧肌支形成潜在卡压,可以解释小指内收恢复困难的原因。

Objective To explore the anatomical characteristic of the third palmar interosseous muscle as well its dominate nerve, and to investigate the anatomical basis of difficult recovery of digitus minimus adduction. Methods Twenty adult fresh hands without deformity and trauma were obtained. Dissect and observe the third palmar interosseous muscle and its dominate nerve and adjacent structure under surgical microscope, measure the size of the third palmar interosseous muscle and its dominate nerve, the data were processed by stastistics method. Results Among palmar interosseous muscles and its dominate nerves, the third palmar interosseous muscle and its dominate nerve is the smallest. There are conspicuous tendon bundle on the surface of the third palmar interosseous muscle partly, which have a potential compression on the third palmar interosseous muscle dominting nerve. Conclusion The third palmar interosseous muscle is the smallest among palmar interosseous muscles and it is the only digitus minimus adduction muscle. The sominating nerve of the third palmar interosseous muscle is small and the tendon bundle of the third palmar interosseous muscle have a potential compression. All these can cast light on diffcuh recovery of digitus minimus adduction.