ostium secundum
noun
ostium se·cun·dum
-sə-ˈkən-dəm 
: an opening in the upper part of the developing embryonic interatrial septum corresponding to the foramen ovale of the fetus
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“Ostium secundum.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/ostium%20secundum. Accessed 22 Dec. 2024.
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