Atrioventricular nodal branch

The atrioventricular nodal branch is a coronary artery that feeds the atrioventricular node, necessary for the excitation of the ventricles.

Atrioventricular nodal branch
Sternocostal surface of heart.
ARTERIES: RCA = right coronary AB = atrial branches SANB = sinuatrial nodal RMA = right marginal LCA = left coronary CB = circumflex branch LAD/AIB = anterior interventricular LMA = left marginal PIA/PDA = posterior descending AVN = atrioventricular nodal VEINS: SCV = small cardiac ACV = anterior cardiac AIV/GCV = great cardiac MCV = middle cardiac CS = coronary sinus
Details
Identifiers
Latin	Ramus nodi atrioventricularis
TA98	A12.2.03.110 A12.2.03.213
TA2	4140
FMA	3851
Anatomical terminology

Structure

The atrioventricular nodal branch sees significant variation in origin:

• proximal right coronary artery in around 77%.[1]
• distal right coronary artery in around 12%.[1]
• posterior interventricular artery in around 7%.[1]
• distal circumflex branch of left coronary artery in around 4%.[1]

The right coronary artery supplies the atrioventricular node in around 90% of people.[1][2]

In approximately 2% of people, the vascular supply to the atrioventricular node arises from both the right coronary artery and the left circumflex branch.[3]

Function

The atrioventricular nodal branch supplies the atrioventricular node, allowing for excitation of the ventricles.[1]

See also

• Coronary circulation

References

1. Kawashima, Tomokazu; Sato, Fumi (2018-10-15). "Clarifying the anatomy of the atrioventricular node artery". International Journal of Cardiology. 269: 158–164. doi:10.1016/j.ijcard.2018.07.022. ISSN 0167-5273.
2. Mahadevan, Vishy (2012-01-01). "Anatomy of the heart". Surgery (Oxford). Cardiothoracic I. 30 (1): 5–8. doi:10.1016/j.mpsur.2011.10.011. ISSN 0263-9319.
3. Sow ML, Ndoye JM, Lo EA. The artery of the atrioventricular node: an anatomic study based on 38 injection-dissections. Surg Radiol Anat 1996;18:183–187