Department of Anatomical Dissection and Donation, Medical University of Lodz, Lodz, Poland.
Department of Neurosurgery, Tulane University School of Medicine, New Orleans, LA, USA.
Surg Radiol Anat. 2021 Jan;43(1):19-25. doi: 10.1007/s00276-020-02531-6. Epub 2020 Jul 12.
The subscapularis muscle is the largest muscle of the rotator cuff and its main function is internal rotation. It is morphologically variable in both point of origin and insertion. The presence of an accessory subscapularis muscle can lead to brachial plexus neuropathy. This report presents a very rare accessory subscapularis muscle originating from two distinct bands on the subscapularis and teres major muscles. The insertion was divided among four tendons. The fourth tendon is bifurcated. One of these was connected to the tendon of the subscapularis muscle and the other three inserted into the base of the coracoid process of the scapula. This anomalous muscle has the potential to entrap the nerves of the posterior cord such as the axillary, lower subscapular, and thoracodorsal nerves.
肩胛下肌是肩袖中最大的肌肉,其主要功能是内旋。它在起点和止点上形态多样。副肩胛下肌的存在可导致臂丛神经病。本报告介绍了一种非常罕见的副肩胛下肌,它起源于肩胛下肌和大圆肌上的两个不同的束。止点分为四束肌腱。第四束肌腱呈分叉状。其中一束与肩胛下肌肌腱相连,另外三束插入肩胛骨喙突的基部。这种异常的肌肉有可能会压迫后束神经,如腋神经、肩胛下神经和胸背神经。