intercalated disk

in·ter·ca·lat·ed disk

noun \in-ˈtər-kə-ˌlāt-əd-\

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

Illustration of INTERCALATED DISK