Unilateral left rectus sternalis muscle: a case report


  • Jessy J. P. Department of Anatomy, GMCH-32, Chandigarh
  • Amrutha K. V. Department of Anatomy, GMCH-32, Chandigarh
  • Joseph Abraham Department of Anatomy, GMCH-32, Chandigarh




Sternalis muscle, Pectoralis major, Rectus abdominis


The rectus sternalis muscle is a small supernumerary muscle present in the anterior thoracic wall and is superficial to the sterno-costal fibers of pectoralis major muscle. In present study we came across left rectus sternalis, originated as a small tendon from the aponeurosis of the external oblique muscle, and the fascia of the rectus abdominis, and seen inserted into the clavicular fibres of pectoralis major of the opposite side of the manubriosternal joint. The rectus sternalis or sternalis muscle is of much importance in the field of radiology or surgery as its presence and knowledge might be effective and useful for the radiologists and surgeons during management of the pectoral region.


Arraez-Aybar LA, Sobraoo-perez J, Merida velasco JR. Left musculus sternalis. Clin Anat. 2003;16(4):350-4.

Kida MY, Izumi A, Tanaka S. Sternalis muscle: topic for debate. Clin Anat. 2000;13:138-40.

Kumar H, Rath G, Sharma M, Kohli M, Rani B. Bilateral sternalis with unusual left sided presentation: A clinical perspective. Yonsei Med J. 2003;44(4):719-22.

Motabagani MA, Sonalla A, Abdel-Meguid E, Bakheit MA. Morphological study of the uncommon rectus sterni muscle in German cadavers. East African Medical Journal. 2004;81(3):130-3.

Shah AC. The Sternalis muscle. Indian J Med Sci. 1968;22:46-7.

Jelev L, Georgiev G, Surchev L. The sternalis muscle in the Bulgarian population: Classification of sternales. J Anat. 2001;199:359-63.

Yap SE. Musculus sternalis in Filipinos. Anat Rec 1021;21:353-71.

Barlow RN. The Sternalis muscle in American whites and Negros. Anat Rec. 1935;1:413-26.

Jones Wood F. Buchanan’s manual of Anatomy. 8th edition. London. Bailliere, Tindall and cox. Henrietta St. 1953;397.

Williams SPL. Gray’s Anatomy. 38th edition. Churchill Livingstone. 1995:838.

Sarikcioglu L, Demirel BM, Oguz N, and Ucar Y. Three sternalis muscles associated with abnormal attachments of the pectoralis major muscle. International journal of experimental and clinical Anatomy. 2008:67-71.

Kulkarni DU, Kulkarni UK. Unilateral Rectus sternalis muscle – A case report. Al Ameen Journal of Medical Science. 2010;3(2):69-71.

Paraskevas GK, Raikos A. Bilateral pectoral musculature malformations with concomitant vascular anomaly. Folia Morphol (Warsz). 2010;69:187-91.

Young Lee B, Young Byun J, Hee Kim H, Sook Kim H, Mee Cho S, Hoon Lee K et al. The sternalis muscles: incidence and imaging findings on MDCT. J Thorac Imaging. 2006;21:179-83.

Schaeffer JP. Morris’ Human Anatomy. 10 edition. Philadelphia: The Blackiston Company. 1942;437.

Folan - Curran J, O’Neill MN. Case report: bilateral sternalis muscles with a bilateral pectoralis major anomaly. Journal of Anatomy. 1998;193:289-92.

Raju S, Raghu J, Sreenivasulu Reddy M, Sirisha B, Indira B, Sujata M. Anunilateral rectus sternalis muscle: Its clinical significance. Journal of Surgical Academia. 2012;2(1):21-2.

Glasser SP. Electrocardiogram of the month. J La State Med Soc. 1975;127(4):136-50.

Kabay B, Akdogan I, Ozdemir B, Adiguzel E. The left sternalis muscle variation detected during mastectomy. Folia Morphol (Warsz). 2005;64(4):338-40.




How to Cite

J. P., J., K. V., A., & Abraham, J. (2017). Unilateral left rectus sternalis muscle: a case report. International Journal of Research in Medical Sciences, 4(7), 3042–3044. https://doi.org/10.18203/2320-6012.ijrms20162001



Case Reports