Kopuz C, Sancak B, Ozbenli S
Department of Anatomy, Medical School, Ondokuz Mayis University.
Kaibogaku Zasshi. 1999 Jun;74(3):301-5.
The occurrence of a third head of the biceps brachii has been reported in several articles. The aim of this study is to determine on the incidence of the third head of biceps brachii in Turkish neonates and adults, and to compare it with other studies. Also the functional and phylogenetic importance of the third head was described here. The third head was studied in 160 arms of 60 (45 males, 15 females) neonatal and 20 (13 males, 7 females) adult cadavers and was found in 24 (15%) specimens. It had the three different origins and frequently arose from the anterior surface of the humerus and distal to the insertion of the coracobrachialis muscle. In all cases, the third head inserted into the conjoined tendon of biceps brachii and received its nerve supply from the musculocutaneous nerve. In our study the rate of the third head was different than those for most other published series and that the difference are possibly caused by evolutionary and/or racial trends in different studied populations. We believe that the third head of biceps brachii muscle is not a relatively rare variant. The knowledge of such variations may become significant in preoperative diagnosis and during surgery.
几篇文章都报道过肱二头肌第三头的出现情况。本研究旨在确定土耳其新生儿和成年人中肱二头肌第三头的发生率，并与其他研究进行比较。此外，还在此描述了第三头的功能和系统发育重要性。对60具（45例男性，15例女性）新生儿和20具（13例男性，7例女性）成人尸体的160条手臂中的第三头进行了研究，在24个（15%）标本中发现了该结构。它有三种不同的起源，常起于肱骨前面、喙肱肌止点的远侧。在所有病例中，第三头均止于肱二头肌联合腱，并接受肌皮神经的神经支配。在我们的研究中，第三头的发生率与大多数其他已发表系列研究的结果不同，这种差异可能是由不同研究人群的进化和/或种族趋势导致的。我们认为肱二头肌第三头并非相对罕见的变异。了解此类变异在术前诊断和手术过程中可能具有重要意义。
