205 



72) degree of contact between ethmoid and pterygoid process of basisphenoid: 0 = narrow; 1 = greater 

 than or equal to medium breadth; 9 = none. 



73) relationship between pterygoid process of basisphenoid and auditory bulla: 0 = does not extend 

 to auditory bulla; 1 = extends to auditory bulla. 



74) bony constituents of wall of foramen ovale with respect to alisphenoid and squamosal: 0 = 

 alisphenoid only; 1 = both alisphenoid and squamosal; 2 = squamosal only. 



Basicranial region (43 characters) 



75) visibility of the mastoid process in dorsal view: 0 = not visible; 1 = visible. 



76) relative shape of basioccipital-basisphenoid region: 0 = concave; 1 = flat; 2 = convex. 

 *77) postglenoid (= glenoid) foramen in squamosal: 0 = absent; 1 = present. 



78) size of postglenoid (= glenoid) foramen in squamosal: 0 = small; 1 = medium; 2 = large; 9 = 

 absent. 



79) shape of anterior edge of auditory bulla: 0 = concave; 1 = flat; 2 = convex. 



80) inflation of ectotympanic: 0 = not inflated; 1 = slightly / moderately inflated; 2 = inflated. 



81) inflation of caudal entotympanic along anteroposterior axis: 0 = not inflated; 1 = slight / moderate 

 inflation; 2 = inflated. 



82) inflation of medial portion of caudal entotympanic: 0 = not inflated; 1 = slight / moderate inflation; 

 2 = inflated. 



83) distinct sulcus dividing ectotympanic and entotympanic portions of auditory bulla: 0 = absent; 1 

 = present. 



84) relationship between auditory bulla and petrosal: 0 = does not cover petrosal; 1 = covers petrosal. 



85) relationship between auditory bulla and paroccipital process: 0 = does not reach process; 1 = 

 reaches (or very closely approaches) process. 



86) groove separating mastoid bulla and petrosal: 0 = absent; 1 = present. 



*87) hypomastoid fossa (found along posteroventral edge of the auditory bulla and containing the 

 stylomastoid groove): 0 = absent; 1 = present. 



88) depth of hypomastoid fossa: 0 = shallow; 1 = medium; 2 = deep; 9 = absent. 



89) distinct petromastoid ridge connecting paroccipital and mastoid processes: 0 = absent; 1 = present. 

 *90) source of "paroccipital" process: 0 = occipital; 1 = occipital and mastoid; 2 = mastoid. 



91) morphology of paroccipital processes: 0 = absent; 1 = elongated ridges; 2 = bumps / pillars. 



92) size of paroccipital processes: 0 = small / not prominent; 1 = intermediate; 2 = large / prominent; 

 9 = processes absent. 



93) relationship between paroccipital processes and mastoid bone: 0 = separate; 1 = adjacent / 

 continuous; 9 = n/a - paroccipital processes absent. 



94) relationship between paroccipital processes and nuchal (= lambdoidal) crest: 0 = separate; 1 = 

 adjacent / continuous; 9 = n/a - paroccipital processes absent. 



95) relative size and shape of posterior lacerate foramen: 0 = not confluent with petrobasilar fissure; 

 1 = confluent with petrobasilar fissure; 9 = petrobasilar fissure absent. 



96) relationship between petrobasilar fissure and basioccipital-basisphenoid suture: 0 = in contact, 

 suture unexpanded; 1 = in contact, suture greatly expanded and confluent with fissure; 9 = petrobasilar 

 fissure absent. 



