Tsakotos George, Triantafyllou George, Olewnik Łukasz, Georgiev Georgi P, Koutserimpas Christos, Karampelias Vasileios, Zielinska Nicol, Piagkou Maria
Anatomy, National and Kapodistrian University of Athens, Athens, GRC.
Anatomical Dissection and Donation, Medical University of Lodz, Lodz, POL.
Cureus. 2023 Aug 14;15(8):e43496. doi: 10.7759/cureus.43496. eCollection 2023 Aug.
This report describes a bilateral symmetric accessory coracobrachialis muscle variant coexisting with a unilateral interconnection of the musculocutaneous nerve and the median nerve. An 80-year-old female cadaver was dissected. The bilateral coracobrachialis muscle variant consisted of three heads: two superficial heads and one deep head. One superficial head arose from the tip of the coracoid process, while the other originated from the short head tendon of the biceps brachii. The deep head of the coracobrachialis muscle emerged from the base of the coracoid process. The musculocutaneous nerve bilaterally coursed between the superficial and deep heads. On the right side, the three-headed coracobrachialis muscle coexisted with an ipsilateral interconnection of the musculocutaneous nerve and the median nerve, located at the lower third of the arm. While the presence of a unilateral three-headed coracobrachialis muscle is not rare (with a prevalence range of 0-22.2%), as well as the distal interconnection between the musculocutaneous nerve and the median nerve at the lower third of the arm (with a prevalence range of 1.8-53.6%), the coexistence of the current bilateral three-headed coracobrachialis muscle variant with the distal interconnection of the musculocutaneous and median nerves is quite unusual. A similar report underscores the finding of the bilateral coracobrachialis muscle variant.
本报告描述了一种双侧对称的副肱肌变异，同时存在肌皮神经与正中神经的单侧连接。解剖了一名80岁女性尸体。双侧肱肌变异由三个头组成：两个浅头和一个深头。一个浅头起自喙突尖，另一个起自肱二头肌短头肌腱。肱肌深头起自喙突基部。双侧肌皮神经走行于浅头和深头之间。在右侧，三头肱肌与同侧肌皮神经和正中神经的连接并存，位于手臂下三分之一处。虽然单侧三头肱肌的存在并不罕见（患病率范围为0 - 22.2%），以及肌皮神经与正中神经在手臂下三分之一处的远端连接（患病率范围为1.8 - 53.6%），但目前双侧三头肱肌变异与肌皮神经和正中神经远端连接并存的情况相当罕见。一份类似的报告强调了双侧肱肌变异的发现。
