Thangarajan Rajesh, Shetty Prakashchandra, Sirasanagnadla Srinivasa Rao, D'souza Melanie Rose
Department of Anatomy, Melaka Manipal Medical College (Manipal Campus), Manipal University, Manipal, Karnataka, India.
Anat Cell Biol. 2014 Dec;47(4):271-3. doi: 10.5115/acb.2014.47.4.271. Epub 2014 Dec 23.
Though anomalies of the superior belly of the omohyoid have been described in medical literature, absence of superior belly of omohyoid is rarely reported. Herein, we report a rare case of unilateral absence of muscular part of superior belly of omohyoid. During laboratory dissections for medical undergraduate students, unusual morphology of the superior belly of the omohyoid muscle has been observed in formalin embalmed male cadaver of South Indian origin. The muscular part of the superior belly of the omohyoid was completely absent. The inferior belly originated normally from the upper border of scapula, and continued with a fibrous tendon which ran vertically lateral to sternohyoid muscle and finally attached to the lower border of the body of hyoid bone. The fibrous tendon was about 1 mm thick and received a nerve supply form the superior root of the ansa cervicalis. As omohyoid mucle is used to achieve the reconstruction of the laryngeal muscles and bowed vocal folds, the knowledge of the possible anomalies of the omohyoid muscle is important during neck surgeries.
虽然医学文献中已描述过肩胛舌骨肌上腹的异常情况，但肩胛舌骨肌上腹缺如的报道却很少见。在此，我们报告一例罕见的肩胛舌骨肌上腹肌肉部分单侧缺如的病例。在为医学本科生进行的实验室解剖过程中，在一具来自南印度的经福尔马林防腐处理的男性尸体上观察到了肩胛舌骨肌上腹不寻常的形态。肩胛舌骨肌上腹的肌肉部分完全缺如。下腹正常起自肩胛骨上缘，延续为一条纤维腱，该纤维腱在胸骨舌骨肌外侧垂直走行，最终附着于舌骨体下缘。该纤维腱约1毫米厚，接受来自颈袢上根的神经支配。由于肩胛舌骨肌用于喉肌和弓形声带的重建，因此在颈部手术中了解肩胛舌骨肌可能存在的异常情况很重要。
