Triantafyllou George, Koptas Krzysztof, Zielinska Nicol, Piagkou Maria, Olewnik Łukasz
Department of Anatomy, School of Medicine, Faculty of Health Sciences, National and Kapodistrian University of Athens, 75 Mikras Asias Str., Goudi, 11527, Athens, Greece.
Department of Anatomical Dissection and Donation, Medical University of Łódź, Łódź, Poland.
Anat Sci Int. 2025 Jan;100(1):123-127. doi: 10.1007/s12565-024-00787-1. Epub 2024 Jul 7.
The brachioradialis muscle (BR) belongs to the lateral forearm muscle. Typically, the radial nerve innervates it. BR morphological variability, such as split muscular belly, split tendon, or accessory BR (ABR), has been described in the current literature. A 68-year-old female donated cadaver was routinely dissected for research and educational purposes. A variant muscle was identified extending at the right arm's lateral and forearm compartments. It originated from the humerus lateral surface between the deltoid and the triceps brachii lateral head, joined the second muscular head from the brachialis muscle, and inserted into the radius styloid process. According to its origin, course, and insertion, the variant muscle probably corresponded to the BR accessory form. However, in the current literature, the ABR morphology corresponds to an accessory muscle originating adjacent to the typical BR and inserted into the radial tuberosity. At the same time, it was defined as "brachioradialis brevis." In the current case, the variant muscle differed significantly from the current literature due to the origin, insertion, length, and relationship with the typical BR; therefore, the term "brachioradialis longus" seemed adequate to describe this variant muscle.
肱桡肌（BR）属于前臂外侧肌群。通常由桡神经支配。目前文献中已描述了肱桡肌的形态变异，如肌腹分裂、肌腱分裂或副肱桡肌（ABR）。为了研究和教学目的，对一具68岁女性捐赠的尸体进行了常规解剖。在右臂外侧和前臂肌间隔发现了一块变异肌肉。它起自三角肌和肱三头肌外侧头之间的肱骨外侧表面，与肱肌的第二个肌头相连，并止于桡骨茎突。根据其起点、走行和止点，这块变异肌肉可能相当于肱桡肌的副肌形式。然而，在目前的文献中，副肱桡肌的形态是指一块起自典型肱桡肌附近并止于桡骨粗隆的副肌。同时，它被定义为“肱桡短肌”。在本病例中，这块变异肌肉在起点、止点、长度以及与典型肱桡肌的关系方面与现有文献有显著差异；因此，“肱桡长肌”这一术语似乎足以描述这块变异肌肉。
