Mehta Vandana, Arora Jyoti, Yadav Yogesh, Suri R K, Rath Gayatri
Department of Anatomy, VMMC & Safdarjung Hospital, New Delhi, India.
Rom J Morphol Embryol. 2010;51(4):799-801.
A cadaveric study was undertaken to report the incidence of sternalis muscle in cadavers of Asian origin. A total of 88 cadavers were studied over a period of six years and the sternalis was reported only in a single case and that too unilaterally. The accessory muscle was discovered in the right pectoral region in a 40-year-old male cadaver. The muscle emanated from the external oblique aponeurosis of abdomen confirming its origin from the ventral longitudinal sheet of muscle. The muscle was fleshy throughout its extent except at the ends where they were aponeurotic. At the sternal angle, the muscle displayed "Y" shaped configuration and merged with the respective sternocleidomastoid muscle. The innervation was derived from the third intercostals nerve. We intend to highlight a few points through this study. Firstly, we found a paucity of studies undertaken to describe the incidence of sternalis muscle. Further, the studies present in anatomical archives are mainly case reports. Secondly, this muscle presents itself in varying configurations on radiological studies. The radiologist should acquaint himself with all these presentations, so that he can make accurate diagnosis of a breast mass. Thirdly, this muscle having more morphological relevance may be conveniently utilized for flap procedures of post mastectomy breast reconstruction. Lastly, the presence of this muscle may alter the depth at which the internal mammary lymph nodes are irradiated in case of carcinoma breast. Additionally, it should not be erroneously diagnosed as a mass which recurred on follow up of breast cancer patients. The present investigation endeavors to discuss the anatomical, embryological and clinical relevance of a rare accessory muscle of the anterior chest wall.
开展了一项尸体研究，以报告亚洲裔尸体中胸骨肌的发生率。在六年时间里共研究了88具尸体，仅在一例中发现了胸骨肌，且为单侧。在一名40岁男性尸体的右侧胸肌区域发现了这块副肌。该肌肉起自腹外斜肌腱膜，证实其起源于腹侧纵行肌层。该肌肉全程肉质化，仅两端为腱膜。在胸骨角处，该肌肉呈“Y”形，并与相应的胸锁乳突肌融合。其神经支配来自第三肋间神经。我们打算通过这项研究强调几点。首先，我们发现描述胸骨肌发生率的研究很少。此外，解剖学文献中的研究主要是病例报告。其次，在放射学研究中，这块肌肉呈现出不同的形态。放射科医生应熟悉所有这些表现，以便能准确诊断乳腺肿块。第三，这块具有更多形态学相关性的肌肉可方便地用于乳房切除术后乳房重建的皮瓣手术。最后，这块肌肉的存在可能会改变乳腺癌患者内乳淋巴结照射的深度。此外，在乳腺癌患者随访时，不应将其错误诊断为复发肿块。本研究旨在探讨前胸壁一种罕见副肌的解剖学、胚胎学和临床相关性。
