The various shapes of the paries jugularis and the frequency of additional ducts in the fossa jugularis as further factors influencing the spread of pathological processes.
We investigated 100 skulls and found in 8 cases a dehiscence of the paries jugularis. In 7 cases this was on the left side and in 1 case on the right. Thickness of the paries jugularis was estimated by means of a diaphanoscopic technique. We classified data according to four degrees of diaphaneity: 0 (hardly translucent), 1 (translucent), 2 (brightly translucent) and 3 (nearly transparent). The frequencies of these degrees were: 0, 38 cases (19%); 1, 122 cases (61%); 2, 35 cases (17.5%); and 3, 5 cases (2.5%). In investigating the frequency of additional ducts in the paries jugularis, we distinguished between three types of solum tympani: type I, no additional canals (18 cases); type II, 1-10 additional canals (172 cases); and type III, more than 10 additional canals (10 cases).
Prescher
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Institut für Anatomie der Medizinischen Fakultät der RWTH, Aachen, Germany.
Brors
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D000328:Adult; D001847:Bone Diseases / Q000473:pathology; D004432:Ear, Middle / Q000033:anatomy & histology* / Q000473:pathology; D006801:Humans; D007601:Jugular Veins; D010579:Petrous Bone / Q000033:anatomy & histology* / Q000473:pathology; D013701:Temporal Bone / Q000033:anatomy & histology* / Q000473:pathology; D014172:Transillumination