A text-book on diseases of the ear, nose and throat . the porusacusticus is the entrance of the aquseductus vestibuli (Fig. 12, s), the con-veyer of endolymph to the membranous labyrinth. The perilymph es-capes from the labyrinth by the way of the aquseductus cochleae. Aboveand beyond the porus acusticus lie the semi-canal for the A^idian nerve andthe hiatus of the Fallopian canal (Fig. 12, d, ? e). Into this groove thecanaliculus petrosus empties (Fig. 12, /). 12 DISEASES OF THE EAR. It should also be borne in mind tliat on the upx^er cerebral surface ofthe petrous portion of the temporal bon
A text-book on diseases of the ear, nose and throat . the porusacusticus is the entrance of the aquseductus vestibuli (Fig. 12, s), the con-veyer of endolymph to the membranous labyrinth. The perilymph es-capes from the labyrinth by the way of the aquseductus cochleae. Aboveand beyond the porus acusticus lie the semi-canal for the A^idian nerve andthe hiatus of the Fallopian canal (Fig. 12, d, ? e). Into this groove thecanaliculus petrosus empties (Fig. 12, /). 12 DISEASES OF THE EAR. It should also be borne in mind tliat on the upx^er cerebral surface ofthe petrous portion of the temporal bone are the petrosal sinuses, closelyconnected with the cavernous sinus, and that into the latter, in turn,empties the ophthalmic vein, a relationshii? that explains the obstructionin the circulation of the veins of the face and eye occurring in otiticphlebitis and thrombosis in the cerebral sinuses. The Tinder Surface of the Temporal Bone.—Under the floor of the drum-cavity lies the jugular bulb (Fig. 13); the anterior wall of the drum- FiG. Under surface of the left temporal bone. (Gray.) a, canals for Eustachian tube and tensor tym-pani muscle ; 6, tensor tympani ; c, levator palati; d, rough quadrilateral surface ; e, opening of carotidcanal;/, canal for Jacobsons nerve; g, aquseductus cochleae; h, canal for Arnolds nerve; i, jugularfossa ; Tc, vaginal process ; I, styloid process ; m, stylomastoid foramen ; n, jugular surface ; o, auricularfissure; p, stylopharyngeus. cavity is part of the carotid canal (Fig. 13) ; the roof of the drum-cavityis a thin septum of bone forming part of the floor of the middle cranialfossa 5 and the mastoid cells are separated by a thin partition of bonefrom the sigmoid groove, or fossa, in which runs the lateral sinus of thedura mater, and beyond which lies the posterior cranial fossa. Inspec-tion of the base of the temporal bone (Fig. 13) shows that the medial ANATOMY AND PHYSIOLOGY OF EXTERNAL AUDITORY CANAL. 13 wall of the mastoid proc
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