Table of Contents
ISRN Anatomy
Volume 2013, Article ID 803853, 6 pages
Research Article

Crista Terminalis, Musculi Pectinati, and Taenia Sagittalis: Anatomical Observations and Applied Significance

1Department of Anatomy, All India Institute of Medical Sciences (AIIMS), Tatibandh, GE Road, Raipur, Chhattisgarh 492099, India
2Department of Anatomy, Rural Medical College, Pravara Institute of Medical Sciences, Loni, Ahmednagar, Maharashtra 413736, India
3Department of Cardiothoracic and Vascular Surgery, JJ Hospital of Grants’ Medical College, Mumbai, Maharashtra 400008, India

Received 24 June 2013; Accepted 17 July 2013

Academic Editors: A. Capehart, P. Hebbard, and T. Nohno

Copyright © 2013 Abu Ubaida Siddiqui et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. The complex architecture of the right atrium, crista terminalis (CT), and the musculi pectinati (MP) poses enormous challenges in electrophysiology and cardiac conduction. Few studies have been undertaken to substantiate the gross features of MP, in relation to the CT, but there is still scarcity of data regarding this. We tried to reinvestigate the gross arrangement of muscle bundles in the right atrium. Methods. Utilizing 151 human hearts and orientation of MP and its variations and relationship to the CT were investigated along with taenia sagittalis (TS). Patterns of MP were grouped in 6 categories and TS under three groups. Result. A plethora of variations were observed. Analysis of all the specimen revealed that 68 samples (45%) were of type 1 category and 27 (18%) fell into type 2 category. Prominent muscular columns were reported in 12 samples (8%). 83 samples (55%) presented with a single trunk of TS. Multiple trunks of TS were reported in 38 samples (25%). Conclusion. Samples with type 6 MP and type B/type C TS, which have a more complex arrangement of fibers, have a tendency to be damaged during cardiac catheterization. Nonetheless, the area as a whole is extremely significant considering the pragmatic application during various cardiac interventions.