. The Journal of laryngology and otology. ofthe second division of the trigeminus has been removed, s. s. Sphenoidalsinus, t. II. Second division of the trigeminus, c. Clivus. h. Hypo-physis, cep. Posterior ethmoidal cells. and 12 mm. in breadth, in the neighbourhood of the left opticnerve. The right sphenoidal sinus { d.) extends to the left sideand comes into contact with the trunks of the left abducens ()the left trochlearis { s,), the left oculo-motor (0. s.) and the firstdivision of the left trigeminal {t. i), together with, for a smalldistance, the first division of the right
. The Journal of laryngology and otology. ofthe second division of the trigeminus has been removed, s. s. Sphenoidalsinus, t. II. Second division of the trigeminus, c. Clivus. h. Hypo-physis, cep. Posterior ethmoidal cells. and 12 mm. in breadth, in the neighbourhood of the left opticnerve. The right sphenoidal sinus { d.) extends to the left sideand comes into contact with the trunks of the left abducens ()the left trochlearis { s,), the left oculo-motor (0. s.) and the firstdivision of the left trigeminal {t. i), together with, for a smalldistance, the first division of the right trigeminal and the rightabducens. This fact, observed by us, gives the anatomical explanation ofthe production of a contra-lateral lesion of the oculo-orbital nervesin disease of a sphenoidal sinus of the opposite side. Our know- June. 1914. Rhinology, and Otology. 311 ledge o£ the rhinogenic, contra-lateral of tlie nerves of theeye has thus been enlarged by a new tetiological factor. n. 0. d. 0. s. t. r. s. a. s. s. s. d. Fig. 4.—Natural size. The thiu transparent bony wall of the right sphen-oidal sinus has been removed, g. Gasserian ganglion. t. iii. Thirddivision of the trigeminal, t. ii. Second division of the trigeminal. division of the trigeminal, Left optic nerve, Eightoptic nerve. Left oculo-motor. Left trochlearis. Leftabducens. s. s. d. Eight sphenoidal sinus. Fig. 5 shows the relationship of the left sphenoidal sinus to thetrunk of the abducens. The sphenoidal sinus is in contact with ,? jraci
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