Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.
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Famous quotes containing the word internal:
“When a person doesnt understand something, he feels internal discord: however he doesnt search for that discord in himself, as he should, but searches outside of himself. Thence a war develops with that which he doesnt understand.”
—Anton Pavlovich Chekhov (18601904)