A medical device, comprising a catheter shaft (107; 182A; 214A) comprising a proximal end and a distal end, the catheter shaft defining a catheter shaft longitudinal axis, a flexible tip portion (110; 188B; 220A) located adjacent to the distal end of the catheter shaft, the flexible tip portion comprising a flexible framework, and a plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) disposed on the flexible framework and forming a flexible array of curved microelectrodes adapted to conform to tissue, wherein the flexible framework includes a first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180D; 210A; 210B; 276-2), each of the first inboard arm, second inboard arm, first outboard arm, and second outboard arm extends along a respective arm longitudinal axis, the curved microelectrodes (102; 138; 172A; 202A'; 272) are disposed on each one of the first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180B; 210A; 210B; 276-2), and are longitudinally spaced apart from one another, each of the first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180D; 210A; 210B; 276-2) comprises a top half and a bottom half characterized in that each one of the curved microelectrodes is segmented, at least one of the plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) is disposed on the top half and at least one of the plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) is disposed on the bottom half, and each of the at least one of the plurality of curved microelectrodes disposed on the top half is longitudinally staggered from a respective one of the plurality of curved microelectrodes disposed on the bottom half. a catheter shaft (107; 182A; 214A) comprising a proximal end and a distal end, the catheter shaft defining a catheter shaft longitudinal axis, a flexible tip portion (110; 188B; 220A) located adjacent to the distal end of the catheter shaft, the flexible tip portion comprising a flexible framework, and a plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) disposed on the flexible framework and forming a flexible array of curved microelectrodes adapted to conform to tissue, wherein the flexible framework includes a first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180D; 210A; 210B; 276-2), each of the first inboard arm, second inboard arm, first outboard arm, and second outboard arm extends along a respective arm longitudinal axis, the curved microelectrodes (102; 138; 172A; 202A'; 272) are disposed on each one of the first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180B; 210A; 210B; 276-2), and are longitudinally spaced apart from one another, each of the first inboard arm (104; 176B; 204; 204B; 276-3), second inboard arm (105; 178B; 208A; 208B; 276-4), first outboard arm (103; 174B; 204A; 204B; 276-1), and second outboard arm (106; 180D; 210A; 210B; 276-2) comprises a top half and a bottom half characterized in that each one of the curved microelectrodes is segmented, at least one of the plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) is disposed on the top half and at least one of the plurality of curved microelectrodes (102; 138A; 172A; 202A'; 272) is disposed on the bottom half, and each of the at least one of the plurality of curved microelectrodes disposed on the top half is longitudinally staggered from a respective one of the plurality of curved microelectrodes disposed on the bottom half.