旋前圆肌的变异：正中神经卡压的 predispositional 作用。 注：“predispositional”这个词在医学语境中不是一个常见词汇，可能是特定研究或文献中创造的术语，这里直接保留英文未翻译，建议结合具体文本进一步理解其准确含义。 一般可能想表达的是“易患性的”之类意思。 完整准确译文可以是：旋前圆肌的变异：正中神经卡压的易患性作用 。
Variations of the pronator teres muscle: predispositional role to median nerve entrapment.
作者信息
Nebot-Cegarra J, Perez-Berruezo J, Reina de la Torre F
机构信息
Department of Morfological Sciences Medical School, Autonomous University of Barcelona.
出版信息
Arch Anat Histol Embryol. 1991;74:35-45.
The variability of the human pronator teres muscle is studied in 60 upper limbs. The humeral head was present in all cases and was double in 3 cases (5.0%). The ulnar head was present in 47 cases (78.3%). The ulnar head was muscular in 11 cases, tendinous in 6 cases, and mixed in 30 cases. The collateral branches of the median nerve destined to the pronator teres muscle were found to be arranged in three main patterns: arising directly from the median nerve, arising from the superficial flexor antebrachial muscles nerve, and mixed type. Special reference is made to the influence of variations in the pronator teres muscle on the compression or the entrapment of the median nerve (pronator syndrome). The proposed determinant variations are: short and tendinous ulnar head, ulnar head joined to the arch of the flexor digitorum superficialis muscle, ulnar head with triple origin slips, and humeral head perforated by the median nerve.
对60例上肢的旋前圆肌变异情况进行了研究。所有病例均有肱骨头，3例（5.0%）为双头。47例（78.3%）有尺骨头。尺骨头为肌性的有11例，腱性的有6例，混合型的有30例。发现支配旋前圆肌的正中神经分支主要有三种排列方式：直接发自正中神经、发自前臂浅屈肌神经以及混合型。特别提及了旋前圆肌变异对正中神经压迫或卡压（旋前圆肌综合征）的影响。提出的决定性变异包括：短腱性尺骨头、与指浅屈肌弓相连的尺骨头、有三个起始腱束的尺骨头以及正中神经穿过的肱骨头。
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