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(一)依小指固有伸肌分裂程度、抵止部位以及是否缺如等为标准,而分为四型:在400例标本中,Ⅰ型和Ⅱa型合计,共有369例,占92.25％;其余的Ⅱb型、Ⅲ型(包括亚型)和Ⅳ型合计,只有31例,占7.75％。前者属正常型,而后者则为变异型。 (二)在Ⅱ、Ⅲ型的标本中,共见到25例副腱束,占调查总数的6.25％。其中最多见的是一条副腱束,共有23例,占调查总数的5.75％,除2例并入第Ⅳ指背腱膜外,余皆并入第Ⅴ指背腱膜内。二条副腱束的只有2例,占调查总数的0.50％,全部并入第Ⅴ指背腱膜内。 (三)小指固有伸肌腱加入指背腱膜以后,并不抵止在小指第一节指骨底,而是分为三束,分别抵止于小指中节和末节指骨底。 (四)腱滑液鞘,共检查160例,归纳为三类:单滑液鞘有109例,占67.58％;分叉形的滑液鞘44例,占27.28％;双滑液鞘6例,占3.72％;三腱(Ⅲc型)分别通过第四、五、六滑液鞘者1例,占0.62％。
(A) Divided into four types according to the degree of extensor division, the site of abortion and the absence of extensors, the number of type Ⅰ and type Ⅱa in total of 369 cases, accounting for 92.25% of the total; Ⅱ b type, type Ⅲ (including subtype) and type Ⅳ total, only 31 cases, accounting for 7.75%. The former is a normal type, while the latter is a variant. (B) in Ⅱ, Ⅲ type specimens, a total of 25 cases of accessory tendons, accounting for 6.25% of the total number of investigations. One of the most common is a tendon bundle, a total of 23 cases, accounting for 5.75% of the total number of investigations, with the exception of two cases incorporated into the fourth part of the dorsal aponeurosis, I have incorporated the first Ⅴ within the dorsal aponeurosis. Only two cases of two tendon bundles, accounting for 0.50% of the total number of investigations, all incorporated into the Ⅴ within the dorsal aponeurosis. (C) the native small finger extensor tendon to join the dorsal aponeurosis, does not stop the first finger in the little finger phalanx, but is divided into three beams, respectively, to stop the middle finger and the distal phalanges of the phalanges. (D) tendon synovial sheath, a total of 160 cases were examined, grouped into three categories: 109 cases of single synovial fluid sheath, accounting for 67.58%; bifurcated synovial sheath in 44 cases, accounting for 27.28%; double synovial sheath in 6 cases , Accounting for 3.72%. Three tendons (Ⅲc type) passed the fourth, fifth and sixth synovial sutures in 1 case, accounting for 0.62%.