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Inferior interventricular artery

Dr Yuranga Weerakkody ◉ and Dr Matt A. Morgan ◉ et al.

The inferior interventricular artery (also known as the posterior interventricular artery or posterior descending artery, PDA) is an artery that extends along the inferior interventricular sulcus. The artery supplies the posterior third of the interventricular septum through posterior septal perforating arteries.

It supplies the the diaphragmatic portion of the left ventricle.

The inferior interventricular artery can anastomose with the anterior interventricular artery, a branch of the left anterior descending (LAD), over the apex of the heart. It can also anastomose with the LAD through each vessel's respective septal perforators.

The vessel that supplies this artery establishes the coronary artery dominance of the heart. In a right-dominant system (89.1%), the right coronary artery supplies it. In a left-dominant system (8.4%), the left circumflex supplies it.

For a more in depth discussion of coronary dominance, see the article coronary arterial dominance.

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: 31781

System: Vascular, Cardiac

Section: Anatomy

Synonyms or Alternate Spellings:

Posterior interventricular artery
Posterior descending artery
Posterior descending artery (PDA)
Posterior interventricular artery (PIV)

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