A manual of otology for students and practitioners . ith and due to suppurative middle-ear disease. Theauthor^ collected all of the cases reported in the literatureof the subject, a total of 88, to w^hich he added 6 cases,making a total of 94. Since that time numerous caseshave been reported by various observers. Anatomy.^—The anatomical arrangement of the sixthnerve renders it susceptible to involvement in the puru-lent diseases affecting the temporal bone. From a pointwhere the nerve enters a perforation in the dura, externalto the inferior petrosal sinus, until it comes in relation to 1 Ann
A manual of otology for students and practitioners . ith and due to suppurative middle-ear disease. Theauthor^ collected all of the cases reported in the literatureof the subject, a total of 88, to w^hich he added 6 cases,making a total of 94. Since that time numerous caseshave been reported by various observers. Anatomy.^—The anatomical arrangement of the sixthnerve renders it susceptible to involvement in the puru-lent diseases affecting the temporal bone. From a pointwhere the nerve enters a perforation in the dura, externalto the inferior petrosal sinus, until it comes in relation to 1 Annals of Otology, etc., September, 1910. ABDUCENS PARALYSIS 375 the branches of the third nerve on the external wall ofthe cavernous sinus, it is contained in a fibrous canalcalled by Gradenigo, Dorellos canal, from the anatomistwho first described it. As it passes forward it is in rela-tion wdth the inferior petrosal sinus which lies imme-diately internal to it, then it passes beneath a bridgewhich is shown cut in Fig. 120. This bridge is formed 3. Fig. 120.—Relations of the sixth nerve. 1, sixth nerve; 2, fifth nerve;3, Gasserian gangUon on fifth nerve; 4, internal carotid artery; 5, inferiorpetrosal sinus; 6, superior petrosal sinus. The petrosphenoidal ligamentis shown cut in the figure. by the petrosphenoidal ligament which extends from theinternal end of the superoposterior border of the petrouspyramid to the base of the posterior clinoid this bridge and slightly anterior to it the nervelies upon the extreme end of the apex of the petrousportion of the temporal bone. Immediately after passing 376 COMPLICATIONS OF PURULENT OTITIS MEDIA the bridge it is in relation above with the superior petrosalsinus and externally with Meckels cave which containsthe Gasserian ganglion. From this point forward it lieson the outer wall of the cavernous sinus, emerging at itsanterior end to enter the orbit through the sphenoidalfissure. Pathology.—It is evident that thic
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectear, bookyear1916
