Natsis K, Didagelos M, Manoli Sm, Vlasis K, Papathanasiou E, Sofidis G, Nerantzidou X
Department of Anatomy, Medical School, Aristotle University of Thessaloniki, Greece.
Hippokratia. 2012 Oct;16(4):378-80.
Palmaris longus variations may include complete agenesis, variation in the location and form of the fleshy portion, aberrancy in attachment, duplication or triplication, accessory tendinous slips, replacing elements of similar form or position. Description of case: An anomalous palmaris longus muscle was found in the right upper extremity of a 63 year-old male cadaver. The muscle was totally fleshy without a long insertion tendon. Its origin was normal, the belly was rather broad and long, fusiform at the upper half and unipennate at the lower half of the forearm, and it was toggled into a short and thick tendon. At its insertion the tendon was split forming a second thinner tendon. The thick tendon was inserted into the flexor retinaculum and the thinner one into the palmar aponeurosis. The muscle compressed the median nerve although no related symptoms were reported on the cadaver's medical history.
This variation is of clinical importance because it may cause carpal tunnel syndrome or difficulties in image interpretation by radiologists. In addition the palmaris longus muscle is an anatomical landmark for operations at the forearm and wrist and its tendon can be used as a graft.
掌长肌变异可能包括完全缺如、肌腹部分位置和形态的变异、附着异常、重复或三联、副腱束、替代相似形态或位置的结构。病例描述：在一名63岁男性尸体的右上肢发现了一条异常掌长肌。该肌肉完全为肉质，无长的插入肌腱。其起点正常，肌腹相当宽阔且长，在前臂上半部分呈梭形，下半部分为单羽状，并且它转变为一条短而粗的肌腱。在其止点处，肌腱分裂形成第二条较细的肌腱。粗肌腱插入屈肌支持带，细肌腱插入掌腱膜。该肌肉压迫正中神经，尽管尸体病史中未报告相关症状。
这种变异具有临床重要性，因为它可能导致腕管综合征或给放射科医生的影像解读带来困难。此外，掌长肌是前臂和腕部手术的解剖标志，其肌腱可作为移植物。
