AnatomyThoraxHeartSmall cardiac vein

AnatomyThoraxHeartSmall cardiac vein

Small cardiac vein

Author: Edwin Ocran, MBChB, MSc • Reviewer: Gordana Sendić, MD
Last reviewed: October 30, 2023
Reading time: 3 minutes

Small cardiac vein (Vena cardiaca parva)

The small cardiac vein is a vessel located mainly within the posterior aspect of the right coronary sulcus, also referred to as the right atrioventricular groove. This vein contributes to the formation of the greater cardiac venous system, along with the coronary sinus and its tributaries, veins draining the right ventricle and veins draining the atria.

The small cardiac vein contributes to the venous drainage of the external layer of the myocardium of the posterior right atrium and right ventricle.

Key facts about the small cardiac vein
Drains from	Small venules of the right and inferior borders of the heart
Tributaries	Right marginal vein
Drains to	Coronary sinus
Drainage area	External layer of the myocardium of the posterior right atrium and right ventricle

This article will discuss the anatomy and function of the small cardiac vein.

Contents

Anatomy and course
Anatomical variations
Sources

+ Show all

Anatomy and course

The small cardiac vein begins in the distal portion of the anterior aspect of the right coronary sulcus, arising from venules surrounding the junction of the right and inferior borders of the heart. It then courses onto the diaphragmatic surface of the heart within the posterior aspect of the right coronary sulcus, emptying into the arterial end of the coronary sinus. Along its course, the small cardiac vein accompanies the right coronary artery (RCA) within the coronary sulcus as well as the marginal branch of the RCA along the inferior border of the heart. The small cardiac vein sometimes receives the right marginal vein. However, in most individuals, the right marginal vein drains directly into the right atrium.

To learn more about the arteries and veins of the heart, explore our articles, quizzes, video tutorials and labelled diagrams.

Anatomical variations

Anatomical variations of the small cardiac vein are common. In about 60% of individuals, this vein is either very small or completely absent. Additionally, instead of draining into the coronary sinus, the small cardiac vein drains directly into the right atrium in about 50% of cases.

Sources

All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines.

References:

Drake, R., Vogl, W., Mitchell, A. & Gray, H. (2015). Gray's anatomy for students. Philadelphia, PA: Churchill Livingstone/Elsevier.
Iaizzo, P. (2009). Handbook of cardiac anatomy, physiology, and devices. New York, NY: Springer
Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
Netter, F. (2019). Atlas of Human Anatomy (7th ed.). Philadelphia, PA: Saunders.
Standring, S. (2016). Gray's Anatomy (41st ed.). Edinburgh: Elsevier Churchill Livingstone.
Tubbs, R. S., Shoja, M. M., Loukas, M., & Bergman, R. A. (2016). Bergman's comprehensive encyclopedia of human anatomic variation. Hoboken: Wiley Blackwell.

Illustrations:

Small cardiac vein (Vena cardiaca parva) - Yousun Koh

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