An end-effector assembly, comprising: opposing first and second jaw assemblies, at least one of the first and second jaw assemblies movable relative to the other from a first position wherein the jaw assemblies are disposed in spaced relation relative to one another to at least a second position wherein the jaw assemblies are closer to one another; the first jaw assembly including: a first housing; and a first electrically-conductive tissue-engaging structure associated with at least a portion of the first housing; the second jaw assembly including a second housing, a second electrically-conductive tissue-engaging structure associated with at least a portion of the second housing, and at least one of the first or second housings of the first and second jaw assemblies having an electrically-conductive outer surface (114, 115) configured to be coupled to an electrosurgical power generating source; and characterised by a dissector electrode coupled along at least a portion of a lateral side of either one of the first housing or the second housing, wherein the dissector electrode is electrically-isolated from the first electrically-conductive tissue-engaging structure and the electrically-conductive outer surface of the at least one first or second housings. opposing first and second jaw assemblies, at least one of the first and second jaw assemblies movable relative to the other from a first position wherein the jaw assemblies are disposed in spaced relation relative to one another to at least a second position wherein the jaw assemblies are closer to one another; the first jaw assembly including: a first housing; and a first electrically-conductive tissue-engaging structure associated with at least a portion of the first housing; the second jaw assembly including a second housing, a second electrically-conductive tissue-engaging structure associated with at least a portion of the second housing, and at least one of the first or second housings of the first and second jaw assemblies having an electrically-conductive outer surface (114, 115) configured to be coupled to an electrosurgical power generating source; and characterised by a dissector electrode coupled along at least a portion of a lateral side of either one of the first housing or the second housing, wherein the dissector electrode is electrically-isolated from the first electrically-conductive tissue-engaging structure and the electrically-conductive outer surface of the at least one first or second housings. a first housing; and a first electrically-conductive tissue-engaging structure associated with at least a portion of the first housing; the second jaw assembly including a second housing, a second electrically-conductive tissue-engaging structure associated with at least a portion of the second housing, and at least one of the first or second housings of the first and second jaw assemblies having an electrically-conductive outer surface (114, 115) configured to be coupled to an electrosurgical power generating source; and characterised by a dissector electrode coupled along at least a portion of a lateral side of either one of the first housing or the second housing, wherein the dissector electrode is electrically-isolated from the first electrically-conductive tissue-engaging structure and the electrically-conductive outer surface of the at least one first or second housings.