A text-book on diseases of the ear, nose and throat . pressure in the cerebrospinal fluid in the subarachnoidcavity will make itself felt through the aquseductus vestibuli in the in- TREATMENT OF CHEOXIC CATARRHAL OTITIS MEDIA. 151 terior of the membranous labyrinth. The same authority shows that theperilymph is poured into the labyrinth from the subarachnoid spacethrough the foramina acustica, and leaves the labyrinth by means of theaquseductus cochleae (Fig. 75, 3). In fact, the perilymphatic cavity isinserted into the lymxDhatic tract of all vertebrates; and, being in con-nection with the s
A text-book on diseases of the ear, nose and throat . pressure in the cerebrospinal fluid in the subarachnoidcavity will make itself felt through the aquseductus vestibuli in the in- TREATMENT OF CHEOXIC CATARRHAL OTITIS MEDIA. 151 terior of the membranous labyrinth. The same authority shows that theperilymph is poured into the labyrinth from the subarachnoid spacethrough the foramina acustica, and leaves the labyrinth by means of theaquseductus cochleae (Fig. 75, 3). In fact, the perilymphatic cavity isinserted into the lymxDhatic tract of all vertebrates; and, being in con-nection with the subarachnoid space, it is seen how changes of any kindin the cerebrospinal fluid can be communicated to the perilymph andthence to the various i)arts of the membranous labyi^inth. Especiallycan we understand how easily intralabyrinth-fluid pressure may beincreased either from the cranial side through the aqueducts or thetympanic side through impaction of the stapes in the oval window, thesemicircular canals thus irritated, and vertigo ensue. Fig. Cast of the left temporal bone after corrosion of the osseous tissue ; the pneumatic cells coverthe entire labyrinth excepting at the outer ends of the aqueducts, the internal auditory canal, andthe upper curve of the superior semicircular canal. (Siebenmann.) 1, superior semicircular canal;2, internal auditory meatus ; entrance of auditory nerve ; 8, aquseductus cochlear; 4, aquaeductus ves-tibuli. If in a i)roperly prepared normal auditoiy apparatus in a cadaversound is conveyed from an organ-pipe into the external ear, the vibra-tions of the membrana, ossicles, and round-window membrane can beseen and measured, as I have shown in my physiological acoustic experi-ments in Helmholtzs laboratory in 1871-72. If the auditory apparatushas been so prepared as to enable the experimenter to convey water tothe labyrinth from the side of the cranial cavity and thus increase theintralabyrinth i)ressure, while the sound vibrations of the oss
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