A practical treatise on the diseases of the ear including the anatomy of the organ . l bonycanals. The axis is about one-seventh of an inch in thicknessat the first turn, but it becomes thinner from the second turn,on to its termination. The axis terminates within the last halfcoil or cupola, in a delicate bony lamella, which resembles thehalf of a funnel, divided longitudinally, and called the infundibu-lum (funnel). Wharton Jones compares the appearance of theaxis of the cochlea after the outer walls have been removed, COCHLEA. 409 to the ordinary pictorial representations of the tower ofBab
A practical treatise on the diseases of the ear including the anatomy of the organ . l bonycanals. The axis is about one-seventh of an inch in thicknessat the first turn, but it becomes thinner from the second turn,on to its termination. The axis terminates within the last halfcoil or cupola, in a delicate bony lamella, which resembles thehalf of a funnel, divided longitudinally, and called the infundibu-lum (funnel). Wharton Jones compares the appearance of theaxis of the cochlea after the outer walls have been removed, COCHLEA. 409 to the ordinary pictorial representations of the tower ofBabel. The cavity of the cochlea is divided into two parts or pas-sages, called scala, by a thin osseous and membranous spirallamina, lamina spiralis ossea. The lower one communicateswith the cavity of the tympanum through the fenestra rotunda,the upper with the recessus heinisphsericus (see Fig. 94, of thevestibule). The former space is therefore called the scala tym-pani, the latter, scala vestibuli. In the scala tympani, justabove the membrana tympani secondaria, which closes the. Bight Osseous Cochlea, opened anteriorly. m. Modiolus. 1. s. Lamina spiralis, h. Hamulus, f. c. Fenestra cochlea. +. Section of thtmiddle wall of the cochea. tt. Its upper extremity, m. d. Modiolus. fenestra rotunda, is an opening called the entrance of theaqueduct to the cochlea. The two scalse communicate at theapex of the cochlea by a common opening called the helico-trema (a twisted foramen). This communication exists in con-sequence of the want of a lamina spiralis in the last half coilof the canal. Two very small canals called aqueducts open by one ex*tremity into the labyrinth, and by the other on the surface ofthe petrous portion of the temporal bone. One opens into 470 COCHLEA. the vestibule, and has already been alluded to, and is calledthe aqueductus vestibuli; the other enters into the tympanicscala of the cochlea, and is called the aqueductus length of the aqueduct of the ves
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Keywords: ., bookcentury1800, bookdeca, booksubjectear, booksubjecteardiseases
