Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Ramus intermedius
Introduction
Synonyms and keywords: Median ramus; ramus; MR
Overview
Overview
If an artery arises from the left main coronary artery between the left anterior descending artery (LAD) and the left circumflex artery (LCX), it is known as the ramus intermedius.
Epidemiology and Demographics
Epidemiology and Demographics
The ramus intermedius occurs in 37% of the general population, and is considered a normal variant.
Additional Images
Additional Images
Shown below are an animated image and a static image depicting the median ramus (MR).
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LAD = Left anterior descending artery; LCx = Left circumflex artery; LM = Left main artery; MR = Median ramus.
References
References
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]