Smallest cardiac veins

Source: Wikipedia, the free encyclopedia.
Smallest cardiac veins
Details
Identifiers
Latinvenae cardiacae minimae,
venae cordis minimae
TA98A12.3.01.013
TA24169
FMA71568
Anatomical terminology

The smallest cardiac veins (also known as the Thebesian veins (named for

myocardium[2] directly into any of the heart chambers.[3]

They are most abundant in the

better source needed
]

Structure

The smallest cardiac veins vary greatly in size and number. Those draining the right atrium have a lumen of up to 2 mm in diameter, whereas those draining the right ventricle have lumens as small as 0.5 mm in diameter.[5]

Course

They run a perpendicular course to the endocardial surface, directly connecting the heart chambers to the medium-sized, and larger coronary veins.[6]

Openings

The openings of the smallest cardiac veins are located in the

heart chambers from the capillary bed in the muscular cardiac wall, enabling a form of collateral circulation unique to the heart. Not every endocardial opening connects to the smallest cardiac veins, as some connect to the vessels of Wearn, which are arteries. Therefore, the endocardial opening must be traced to a vein before it is definitely called an opening of the smallest cardiac veins.[citation needed
]

Function

The small cardiac veins are responsible for venous return of 10% of the coronary blood supply.

pulmonary veins, contribute to normal physiologic shunting
of blood. As a consequence of the input of these vessels, blood in the left heart is less oxygenated than the blood found at the pulmonary capillary beds, usually to a very small degree.

History

Etymology

The smallest cardiac veins are also known as the Thebesian veins.

anatomist Adam Christian Thebesius, who described them in a 1708 treatise called Disputatio medica inauguralis de circulo sanguinis in corde.[10][11]

Mislabelling

The smallest cardiac veins are sometimes accurately referred to as vessels, but they are frequently confused with a distinct set of artery connections,[12][13][14][15] eponymously referred to as the "vessels of Wearn".[16] In his 1928 publication, Wearn himself referred to the arterio-cameral connections (vessels of Wearn) as Thebesian,[17] but later, after additional research, provided disambiguation and strictly used the term Thebesian for coronary vein-heart chamber connections.[18]

References

  1. PMID 14246341
    .
  2. ISBN 978-0-7817-7055-2
    . Retrieved 31 October 2010.
  3. PMID 32491498
    , retrieved 2023-01-05
  4. ^ "Venae cordis minimae". radiopaedia.org. Retrieved 31 August 2019.
  5. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link
    )
  6. doi:10.1152/ajplegacy.1898.1.1.86
    .
  7. PMID 32491498
    , retrieved 2023-01-05
  8. PMID 18703466
    .
  9. PMID 19901354
    .
  10. Who Named It?
  11. ^ Thebesius, AC (1708). Disputatio medica inauguralis de circulo sanguinis in corde. Doctoral dissertation, Leiden.
  12. PMID 27743821
    .
  13. S2CID 40212007
    .
  14. PMID 19312228
    .
  15. doi:10.1016/S0002-8703(33)90711-5
    .
  16. PMID 26139649
    .
  17. PMID 19869414
    .
  18. doi:10.1016/S0002-8703(33)90711-5
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Smallest_cardiac_veins&oldid=1206250152"