Nakatani T, Tanaka S, Mizukami S
Department of Anatomy II, School of Medicine, Kanazawa University, Japan.
Clin Anat. 1998;11(3):209-12. doi: 10.1002/(SICI)1098-2353(1998)11:3<209::AID-CA10>3.0.CO;2-N.
Bilateral four-headed biceps brachii muscles were observed in the dissected cadaver of a 95-year-old Japanese woman. The third head on both sides originated from the humerus at the insertion of the coracobrachialis and inserted into the distal part of the biceps brachii and the proximal part of the common biceps tendon on the ipsilateral side. The fourth head on both sides arose from a thin fibrous origin from the intertubercular sulcus and the insertion of the pectoralis major, and inserted into the confluence of the biceps brachii and the third head. This anomaly is relatively rare. Moreover, the left third head gave off a muscle slip into the posterior fascia of the pronator teres, forming a tunnel. The median nerve and the brachial artery passed through the tunnel, where the nerve and artery seemed to be compressed. The possible production of clinical symptoms, given the anatomy, is discussed.
在一名95岁日本女性的解剖尸体中观察到双侧肱二头肌四个头。两侧的第三个头起源于肱肌在喙肱肌止点处的肱骨，并插入到肱二头肌远端和同侧肱二头肌总腱近端。两侧的第四个头起自结节间沟和胸大肌止点处的薄纤维起点，插入到肱二头肌和第三个头的汇合处。这种异常相对罕见。此外，左侧第三个头发散出一条肌束进入旋前圆肌后筋膜，形成一个隧道。正中神经和肱动脉穿过该隧道，神经和动脉似乎在此处受压。结合解剖结构讨论了可能产生临床症状的情况。
