Extensions of the cardiac plasma membrane from the intercalated disk of one cell into the transverse tubules of the adjacent cell.
D000818:Animals; D002462:Cell Membrane / Q000502:physiology*; D004553:Electric Conductivity; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009206:Myocardium / Q000166:cytology*; D051381:Rats; D013499:Surface Properties; D016276:Ventricular Function