the same size much larger with narrow posterior edge. 228. (0) no distance, both Distance between perilymphatic foramen and fenestra rotunda: apertures are confluent; (1) narrow, distance < 89% of the distance between fenestra ovalis and fenestra rotunda; (2) narrow, distance > 89% of the distance between fenestra ovalis and fenestra rotunda; (3) very wide, distance > 146%. 229. (0) very narrow, Distance between endolymphatic foramen and fenestra rotunda: distance < 112% of the distance between fenestra ovalis and fenestra rotunda; (1) narrow, distance between 121% and 185%; (2) wide, distance between 192% and 211%; (3) very wide, distance > 222% the distance between fenestra ovalis and fenestra rotunda. 230. (0) Elongation of pars cochlearis towards cranial cavity, dorsally and medially: absent; (1) present, inner porous bone expanded towards cranial cavity; (2) present, outer periosteal bone of pars cochlearis expanded towards cranial cavity. 231. (0) absent; (1) present, Excavation of tegmen tympani at base of anterior process: fossa on dorsolateral side of tegmen tympani. 232. Dorsal edge of tegmen tympani dorsolateral to internal acoustic meatus and (0) present and high, dorsoventral height > 114% the width of pars anterior process: cochlearis; (1) present, height between 58% and 34% of promontorial width; (2) low, height between 23% and 11%; (3) forms a low ridge or is absent, height < 4% of the width of pars cochlearis. 233. (0) present and Dorsal edge of tegmen tympani lateral to endolymphatic foramen: very high, dorsoventral height > 112% of the width of pars cochlearis; (1) high, height between 95% and 50% the promontorial width; (2) low, height between 12%
the same size much larger with narrow posterior edge. 228. Distance between perilymphatic foramen and fenestra rotunda: (0) no distance, both apertures are confluent; (1) narrow, distance < 89% of the distance between fenestra ovalis and fenestra rotunda; (2) narrow, distance > 89% of the distance between fenestra ovalis and fenestra rotunda; (3) very wide, distance > 146%. 229. Distance between endolymphatic foramen and fenestra rotunda: (0) very narrow, distance < 112% of the distance between fenestra ovalis and fenestra rotunda; (1) narrow, distance between 121% and 185%; (2) wide, distance between 192% and 211%; (3) very wide, distance > 222% the distance between fenestra ovalis and fenestra rotunda. 230. Elongation of pars cochlearis towards cranial cavity, dorsally and medially: (0) absent; (1) present, inner porous bone expanded towards cranial cavity; (2) present, outer periosteal bone of pars cochlearis expanded towards cranial cavity. 231. Excavation of tegmen tympani at base of anterior process: (0) absent; (1) present, fossa on dorsolateral side of tegmen tympani. 232. Dorsal edge of tegmen tympani dorsolateral to internal acoustic meatus and anterior process: (0) present and high, dorsoventral height > 114% the width of pars cochlearis; (1) present, height between 58% and 34% of promontorial width; (2) low, height between 23% and 11%; (3) forms a low ridge or is absent, height < 4% of the width of pars cochlearis. 233. Dorsal edge of tegmen tympani lateral to endolymphatic foramen: (0) present and very high, dorsoventral height > 112% of the width of pars cochlearis; (1) high, height between 95% and 50% the promontorial width; (2) low, height between 12%
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