Revision 19 for 'Right coronary artery'

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Right coronary artery

The right coronary artery is one of the two main coronary arteries. It arises from the right coronary sinus as one of only two branches ascending aorta.

Gross anatomy

Supply

The right coronary artery courses to the right in the right atrioventricular groove, along the anterior surface to the inferior surface of the heart. In right dominant circulation (seen in the majority of people), the RCA turns anteriorly at the crus to become the inferior interventricular artery, hence supplying the inferior 1/2 of the interventricular septum. In people with left dominant circulation the inferior inter ventricular artery arises from the left circumflex artery.

Branches

Variant anatomy

Variations in origin

  • from the aorta at or above the sinotubular junction
  • from the left coronary sinus or left coronary artery where the proximal RCA takes a 'malignant' inter-arterial course in which the vessel is prone to extrinsic compression
  • In up to 50% of cases there are separate ostia for the RCA and conus artery 2

Variations in branching

  • PDA and PLV as terminal branches
  • PDA as the only terminal branch (in which PLV is supplied by the LCx)
  • Terminates as a acute marginal (in left dominant circulations)

Variations in course

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