eustachian valve

noun, often capitalized E

Medical Definition of eustachian valve

: a crescent-shaped fold of the lining membrane of the heart at the entrance of the inferior vena cava that directs the blood through the foramen ovale to the left atrium in the fetus but is rudimentary and functionless in the adult

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“Eustachian valve.” The Merriam-Webster.com Medical Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/medical/eustachian%20valve. Accessed 11 December 2019.

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