Department of Anatomy, Second Faculty of Medicine, Charles University, Plzenska 130/221, 150 06, Prague 5, Czech Republic.
Department of Health Care Studies, College of Polytechnics, Tolsteho 16, 586 01, Jihlava, Czech Republic.
Surg Radiol Anat. 2023 Mar;45(3):271-275. doi: 10.1007/s00276-023-03084-0. Epub 2023 Jan 25.
Knowledge of the unusual arrangement of the flexor pollicis longus (FPL) muscle is important as the variable tendon may be a rare cause of carpal tunnel syndrome.
During a routine dissection at the Department of Anatomy, an unusual formation of the FPL muscle was observed in a formalin embalmed Central European cadaver.
This report presents a variation of the FPL muscle, where the muscle split and formed a separate accessory head inserting into the first lumbrical muscle. Moreover, a tendinous interconnection was present between the FPL muscle tendon and the tendon of the aberrant muscle head.
The cases described by previous literature, concerning the Linburg-Comstock variation or the accessory head of the first lumbrical muscle originating from the FPL muscle, are closest to the present case. Such variation has a clinical significance ranging from the functional limitation of the thumb and index finger movement to the potential median nerve compression.
了解拇长屈肌（FPL）的异常排列非常重要，因为变异的肌腱可能是腕管综合征的罕见原因。
在解剖学系进行常规解剖时，在一具经过福尔马林防腐处理的中欧尸体中观察到 FPL 肌肉的异常结构。
本报告介绍了 FPL 肌肉的一种变异，其中肌肉分裂并形成一个单独的副头，插入第一蚓状肌。此外，FPL 肌肉肌腱和异常肌头肌腱之间存在腱性连接。
与本病例最接近的是先前文献中描述的 Linburg-Comstock 变异或起源于 FPL 肌肉的第一蚓状肌副头的情况。这种变异具有从拇指和食指运动功能受限到潜在正中神经受压的临床意义。
