the small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve that separates the right atrium from the left ventricle. Syn: septum atrioventriculare [NA], pars membranacea septi atriorum.
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the small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve that separates the right atrium from the left ventricle. Syn: septum atrioventriculare [NA], pars membranacea septi atriorum.