musculi pectinati

noun plural
mus·​cu·​li pec·​ti·​na·​ti | \ˈməs-kyə-ˌlī-ˌpek-ti-ˈnā-ˌtī \

Medical Definition of musculi pectinati 

: small muscular ridges on the inner wall of the auricular appendage of the left and the right atria of the heart

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