255. (0) fused to anterior process accessory ossicle or homologous region on lip of bulla: of petrosal; (1) not fused. 256. (0) present; (1) absent. Lateral furrow of ectotympanic bulla: 257. (0) broad sulcus; (1) narrow crease. Lateral furrow: 258. (0) forms a straight transverse plate that is directed perpendicular Sigmoid process: to long axis of bulla; (1) forms a curved plate; proximal part is directed posterolaterally while the distal end curves to point laterally. 259. (0) present; (1) absent; in its place the lateral Ventral margin of sigmoid process: margin of sigmoid process smoothly turns into a sulcus on lateral side of bulla. 260. (0) contacts sigmoid fossa of squamosal; (1) distal Dorsal edge of sigmoid process: end expanded anteriorly to articulate with lateral tuberosity of petrosal only; (2) does not articulate with squamosal or petrosal. 261. (0) present, connection between Elliptical foramen of ectotympanic bulla: ectotympanic bulla and its posterior process is split into two pedicles; (1) absent. 262. (0) contacts postmeatic Anterior edge of posterior process of ectotympanic bulla: process of squamosal; (1) contact absence. 263. (0) contains sporadic areas of laminated bone at Posterior process of tympanic: posterodorsal end; (1) almost entire process is laminated bone. 264. (0) thick in region ventral to Thickness of posterior process of ectotympanic: articulating surface with petrosal; (1) forms a thin lamina. 265. (0) thinner or approximately the Distal end of posterior process of ectotympanic: same thickness as more proximal portions; (1) distal end thicker but not hypertrophied; (2) hypertrophied in size, forms large nodular mass.
255. accessory ossicle or homologous region on lip of bulla: (0) fused to anterior process of petrosal; (1) not fused. 256. Lateral furrow of ectotympanic bulla: (0) present; (1) absent. 257. Lateral furrow: (0) broad sulcus; (1) narrow crease. 258. Sigmoid process: (0) forms a straight transverse plate that is directed perpendicular to long axis of bulla; (1) forms a curved plate; proximal part is directed posterolaterally while the distal end curves to point laterally. 259. Ventral margin of sigmoid process: (0) present; (1) absent; in its place the lateral margin of sigmoid process smoothly turns into a sulcus on lateral side of bulla. 260. Dorsal edge of sigmoid process: (0) contacts sigmoid fossa of squamosal; (1) distal end expanded anteriorly to articulate with lateral tuberosity of petrosal only; (2) does not articulate with squamosal or petrosal. 261. Elliptical foramen of ectotympanic bulla: (0) present, connection between ectotympanic bulla and its posterior process is split into two pedicles; (1) absent. 262. Anterior edge of posterior process of ectotympanic bulla: (0) contacts postmeatic process of squamosal; (1) contact absence. 263. Posterior process of tympanic: (0) contains sporadic areas of laminated bone at posterodorsal end; (1) almost entire process is laminated bone. 264. Thickness of posterior process of ectotympanic: (0) thick in region ventral to articulating surface with petrosal; (1) forms a thin lamina. 265. Distal end of posterior process of ectotympanic: (0) thinner or approximately the same thickness as more proximal portions; (1) distal end thicker but not hypertrophied; (2) hypertrophied in size, forms large nodular mass.
SuppFiles1_Isthminia_matrix.docx