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Third coronary artery: its development and function.

M Miyazaki1, M Kato

  • 12nd Department of Anatomy, Toho University School of Medicine, Tokyo, Japan.

Acta Cardiologica
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

The third coronary artery, originating from the aorta, shows variations in its orifice position. Pathologic hearts exhibit more multiple orifices and larger sizes, suggesting a role in collateral circulation post-birth.

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Area of Science:

  • Cardiovascular Anatomy
  • Human Embryology
  • Coronary Artery Anatomy

Background:

  • The third coronary artery originates directly from the aorta.
  • It forms anastomoses by the fetal stage.
  • Understanding its variations is crucial for cardiovascular research.

Purpose of the Study:

  • To investigate the origin and positional variations of the third coronary artery in human hearts.
  • To analyze these variations across different age groups, from fetuses to adults.
  • To compare findings in normal versus pathologic hearts.

Main Methods:

  • Stereoscopic examination of 622 normal human hearts.
  • Classification of third coronary artery orifice orientation into three types (10, 9, and 8 o'clock).
  • Analysis of orifice incidence, multiplicity, and size in relation to age and cardiac pathology.

Main Results:

  • No significant difference in the incidence of the three orifice orientation types.
  • Pathologic hearts showed a higher incidence of multiple third coronary artery orifices compared to normal hearts, independent of age.
  • The size of the third coronary artery orifice was larger in pathologic hearts than in normal hearts.

Conclusions:

  • The third coronary artery's anatomy exhibits variations in orifice orientation.
  • Multiple orifices and larger sizes in pathologic hearts suggest a potential role in developing collateral circulation after birth.
  • Further research into the third coronary artery's function in cardiovascular health is warranted.