Komiyama M, Nwe T M, Toyota N, Shimada Y
Department of Anatomy and Cell Biology, School of Medicine, Chiba University, Japan.
J Hand Surg Br. 1999 Oct;24(5):575-8. doi: 10.1054/jhsb.1999.0239.
Variations of the extensor indicis muscle were examined in 164 hands from 86 Japanese cadavers. Anomalous cases exhibiting supernumerary muscles or tendons were found in 22 hands. These variations were classified into four types: type 1, an additional tendon slip from the extensor indicis tendon; type 2, an extensor indicis radialis or extensor pollicis et indicis accessorius; type 3, an extensor medii proprius with or without extensor medii brevis; and type 4, an extensor indicis radialis and extensor medii proprius. The extensor medii proprius was the most common variation, followed by extensor indicis radialis. There were no clear differences in incidence of variations between men and women or between right and left hands. When variations were bilateral, both sides were identical or similar in type.
对86具日本尸体的164只手的示指伸肌变异情况进行了检查。在22只手中发现了存在多余肌肉或肌腱的异常病例。这些变异分为四种类型：1型，示指伸肌腱额外的腱束；2型，桡侧示指伸肌或拇示指副伸肌；3型，固有示指伸肌伴或不伴短示指伸肌；4型，桡侧示指伸肌和固有示指伸肌。固有示指伸肌是最常见的变异类型，其次是桡侧示指伸肌。男性和女性之间以及右手和左手之间变异的发生率没有明显差异。当变异为双侧时，两侧的类型相同或相似。
