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Sinoatrial nodal artery

Dr Yuranga Weerakkody ◉ and Dr David Benjabutr et al.

The sinoatrial (SA) nodal artery is the small artery that supplies the sinoatrial (SA) node of the heart (the pacemaker).

Gross anatomy

Origin

Right coronary artery in 60% of cases and the left coronary artery in 40% of cases.

Course

The artery turns posteriorly below the superior vena caval opening.

Variant anatomy

The SA node can arise from its own opening in the anterior aortic sinus.

A study of 516 SA nodal arteries using MDCT found 96.4% of arteries were single whilst 3.6% were double. In this study only 53.4% of SA nodal arteries originated from the right coronary artery with 43% originating from the left circumflex artery.

Other variants include

S-shaped variant ⁴

References

Anatomy: Thoracic

thoracic skeleton
- thoracic cage
  - ribs
    - typical ribs
    - atypical ribs
    - variant anatomy
      - bifid ribs
  - costal cartilage
  - sternum
- thoracic spine
- articulations
muscles of the thorax
spaces of the thorax
thoracic viscera
blood supply of the thorax
- arteries
  - thoracic aorta (development)
  - pulmonary trunk
    - left pulmonary artery
      - aberrant left pulmonary artery
    - right pulmonary artery
- veins
  - superior vena cava (cavoatrial junction)
  - inferior vena cava
  - coronary veins
    - cardiac veins which drain into the coronary sinus
      - great cardiac vein
      - middle cardiac vein
      - small cardiac vein
      - posterior vein of the left ventricle
      - vein of Marshall (oblique vein of the left atrium)
    - anterior cardiac veins
    - venae cordis minimae (smallest cardiac veins or thebesian veins)
  - pulmonary veins
    - bronchial veins
lymphatics
innervation of the thorax

Article information

rID: 52834

System: Cardiac

Section: Anatomy

Synonyms or Alternate Spellings:

SA nodal artery
Sinoatrial nodal branch

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