Lee Song Eun, Jung Chaeyong, Ahn Kyu Youn, Nam Kwang Il
Department of Anatomy, Chonnam National University Medical School, Gwangju, Korea.
Anat Cell Biol. 2011 Sep;44(3):238-40. doi: 10.5115/acb.2011.44.3.238. Epub 2011 Sep 29.
Anatomical variations of the biceps brachii have been described by various authors, but the occurrence of bilateral asymmetric supernumerary heads is rare and has not been reported. We found three accessory heads of the biceps brachii muscle on right arm and an anomalous third head of biceps brachii on left arm. The third, fourth, and fifth heads of right arm originated from the body of humerus at the insertion site of coracobrachialis and inserted into the distal part of biceps brachii short head in order. The third head of left arm originated from humerus at the insertion site of coracobrachialis and combined with the distal part of biceps brachii and continued to the proximal part of common biceps tendon. Understanding the existence of bilateral asymmetric supernumerary heads of biceps brachii may influence preoperative diagnosis and surgery on the upper limbs.
多位作者描述过肱二头肌的解剖变异情况，但双侧不对称额外头的出现较为罕见且此前未见报道。我们在右臂发现了肱二头肌的三个副头，在左臂发现了一个异常的肱二头肌第三头。右臂的第三、第四和第五头依次起自肱骨在肱肌附着处的主体部分，并插入肱二头肌短头的远端。左臂的第三头起自肱骨在肱肌附着处，并与肱二头肌的远端合并，延续至肱二头肌总腱的近端。了解肱二头肌双侧不对称额外头的存在情况可能会影响上肢手术的术前诊断。
