Taenia sagittalis
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At the time the article was created Joachim Feger had no recorded disclosures.
View Joachim Feger's current disclosuresAt the time the article was last revised Joachim Feger had no recorded disclosures.
View Joachim Feger's current disclosures- Sagittal bundle of the right atrium
- Sagittal bundle of the pectinate muscles
The taenia sagittalis or sagittal bundle is a prominent pectinate muscle and a band-like structure in the right atrium and constitutes a mimic for right atrial thrombi or masses.
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Gross anatomy
The taenia sagittalis originates from the crista terminalis and extends upwards and anteriorly dividing the atrial appendage into anteromedial and posterolateral divisions 1,2.
Variant anatomy
The taenia sagittalis is absent in about 15-20%, it forms a single bundle in up to 65% and multiple bands in about 20-25% of the population 1,3.
Radiographic features
CT
On thoracic or cardiac CT, the taenia sagittalis can be regularly visualized as a linear muscular band 1.
MRI
The taenia sagittalis can be easily depicted on cardiac MRI with cine images or on a 3D whole-heart sequence with the same signal intensity of cardiac muscle.
Clinical importance
The presence of taenia sagittalis is of no pathologic significance, however, it might be of relevance in the following clinical situations 1,3:
- possible predisposing factor for atrial fibrillation
- atrial catheters might get stuck near the taenia sagittalis in complex atrial anatomy
References
- 1. Rajiah P, MacNamara J, Chaturvedi A, Ashwath R, Fulton N, Goerne H. Bands in the Heart: Multimodality Imaging Review. Radiographics. 2019;39(5):1238-63. doi:10.1148/rg.2019180176 - Pubmed
- 2. Siddiqui A, Daimi S, Gandhi K et al. Crista Terminalis, Musculi Pectinati, and Taenia Sagittalis: Anatomical Observations and Applied Significance. ISRN Anatomy. 2013;2013:1-6. doi:10.5402/2013/803853 - Pubmed
- 3. Kucybała I, Ciuk K, Klimek-Piotrowska W. Clinical Anatomy of Human Heart Atria and Interatrial Septum — Anatomical Basis for Interventional Cardiologists and Electrocardiologists. Part 1: Right Atrium and Interatrial Septum. Kardiol Pol. 2018;76(3):499-509. doi:10.5603/kp.a2017.0248 - Pubmed
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