. Human physiology (Volume 1) . g, and does not, by anymeans, admit of easy is a conoidal canal, spirallyconvoluted, making two turnsupon itself, and resting on a bonynucleus or pillar, called modio-lus. The base of the nucleus isconcave ; corresponds to the bot-tom of the meatus auditorius in-ternus, and is pierced by smallforamina, through which the fila-ments of the auditory nerve reachthe cochlea. The spiral canal isdivided, in its whole length,by a partition, half osseous andhalf membranous, called laminaspiralis; so that two distincttubes are thus formed. These arethe scal
. Human physiology (Volume 1) . g, and does not, by anymeans, admit of easy is a conoidal canal, spirallyconvoluted, making two turnsupon itself, and resting on a bonynucleus or pillar, called modio-lus. The base of the nucleus isconcave ; corresponds to the bot-tom of the meatus auditorius in-ternus, and is pierced by smallforamina, through which the fila-ments of the auditory nerve reachthe cochlea. The spiral canal isdivided, in its whole length,by a partition, half osseous andhalf membranous, called laminaspiralis; so that two distincttubes are thus formed. These arethe scalx of the cochlea. At theapex of the cochlea they runinto each other, by an opening termed by Breschet helicotrema ;but, at the base, the one turns into the vestibule, and is hencecalled the superior or vestibular or internal scala ; the othercommunicates with the cavity of the tympanum by the foramenrotundum, and is called the inferior, tympanic, or external this scala, near the foramen rotundum, a bony canal be°-ins,. Cochlea divided parallel with its axis, throughcentre of Modiolus. — (Breschet.)1. Modiolus. 2. Infundibulum in which themodiolus terminates. 3, 3. Cochlear its filaments through centre of modio-lus. 4, 4. Scala tympani of first turn ofcochlea 5, 5. Scala vestibuli of first Section oflamina spiralis, itszonula ossea ;one of the filaments of the cochlear nerve isseen passing between the two layers of thelamina spiralis to be distributed upon themembrane which invests the lamina. 7. Mem-branous portion of the lamina spiralis. formed by filaments of cochlear , 9. Scala tympani of second turn of ,10. Scala vestibuli of second turn : the sep-tum between the two is the lamina spiralis. 11. Scala tympani of remaining half turn. 12. Remaining half turn of scala vestibuli; thedome placed over this half turn is the cupola. 13. Lamina of bone which forms the floor ofthe scala vestibuli curving spirally round toconst
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
