. The anatomy of the domestic animals . Veterinary anatomy. ' A Fig. 702.—Right Petrous Temporal Bone of Horse; Antero-medial View. 1, External acoustic meatus; 2, annulus tym- panicus; 5, laminae radiating from 2; -J, membrana tj'mpani; 5, malleus; 6, incus; 7, stapes; 8, fenestra cochleEe (s. rotundum); 9, facial canal; 11, 11", semi- circular canals; 11', vestibule; 12, cochlea. (After Ellenberger, in Leisering's Atlas.) Fig. 703.—Right Auditory Ossicles and Mem- brana Tympani, Enlarged and Viewed from Inner Side and Below. ly Malleus; 2, incus; 2', 2", short and long proc- esses
. The anatomy of the domestic animals . Veterinary anatomy. ' A Fig. 702.—Right Petrous Temporal Bone of Horse; Antero-medial View. 1, External acoustic meatus; 2, annulus tym- panicus; 5, laminae radiating from 2; -J, membrana tj'mpani; 5, malleus; 6, incus; 7, stapes; 8, fenestra cochleEe (s. rotundum); 9, facial canal; 11, 11", semi- circular canals; 11', vestibule; 12, cochlea. (After Ellenberger, in Leisering's Atlas.) Fig. 703.—Right Auditory Ossicles and Mem- brana Tympani, Enlarged and Viewed from Inner Side and Below. ly Malleus; 2, incus; 2', 2", short and long proc- esses of 2; 3, stapes; 4, tensor tympani; -5, ligament attaching long process of malleus; 6, stapedius muscle; 7, fenestra cochleae (s. rotundum). (After Ellenberger, in Leisering's Atlas.) middle fibrous layer or membrana propria includes two chief sets of fibers; the external layer (Stratum radiatum) consists of fibers which radiate from the handle of the malleuSj while the internal layer (Stratum circulare) is composed of circular fibers which are best developed peripherally. There are also branched or dendritic fibers in part of the membrane. The internal mucous layer (Stratum mucosum) is a part of the general mucous membrane which lines the tympanic cavity. The medial J labyrinthine wall of the tympanic cavity (Paries labyrinthica) separates it from the internal ear; it presents a number of special features. The promontory (Promontorium) is a distinct eminence near the center which corre- sponds to the first coil of the cochlea, and is marked by a faint groove for the super- ficial petrosal nerve. Above this is the fenestra vestibuli, a reniform opening which is closed by the foot-plate of the stapes and its annular ligament. The fenestra cochleae is situated below and behind the preceding; it is an irregularly oval opening and is closed by a thin membrane (Membrana tympani secundaria), which s(']:>arates the tympanic cavity from the scala tympani of the cochlea. The ante
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