intercalated disk

noun
in·​ter·​ca·​lat·​ed disk | \ in-ˈtər-kə-ˌlāt-əd- How to pronounce intercalated disk (audio) \

Medical Definition of intercalated disk

: any of the specialized regions of the sarcolemma and underlying cytoplasm of cardiac muscle cells that comprise the longitudinal and end-to-end junctions between adjacent cells and that function to connect them mechanically and electrically

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