. The cat; an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP. III.] SKELETOX OF, THE HEAD AXD TRUNK. 07 by a foramen just bcliind the post-gleiioid processâa post-gJenoid foramen. Tliis, however, is generally absent. The margin of the petrosal, above the cerebellar fossa and internal meatus, developes a bony ridge, which unites with the tentorial plate, before described as passing downwards and forwards from within the parietal. The cavity of the bulla is almost completely di\aded within into two very unequal parts by a bony septum which as
. The cat; an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP. III.] SKELETOX OF, THE HEAD AXD TRUNK. 07 by a foramen just bcliind the post-gleiioid processâa post-gJenoid foramen. Tliis, however, is generally absent. The margin of the petrosal, above the cerebellar fossa and internal meatus, developes a bony ridge, which unites with the tentorial plate, before described as passing downwards and forwards from within the parietal. The cavity of the bulla is almost completely di\aded within into two very unequal parts by a bony septum which ascends from the. Fig. 3G.âVlktical Section of the Alditorv Bulla of the Tiger (Fhaxr). <im. Meatus aucUtorius externus. 130. Basi-occipital. e. Eustachian canal. ic. Inner chamber of bulla. (»c. Outer clianiber of bulla. pt. Promontoiy of petrusal. s. The seiituin. Sq. Sc(uaiii<iSiil. t. Tympanic ring. â The aperture of communication between the two chambers. floor of the bidla. The outer and anterior chamber is much the smaller. It is the true tympanic chamber, and has on its outer wall a horseshoe-shaped prommence and grooveâthe tympanic ring âto which the tympanic membrane (or membrane of the drum of the ear) is attached. It also contains three very small and irregularly- shaped bones: (1) the malleus,- (2) the incia^; and (3), the stapes, which stretch across from the inside of the tympanic membrane to the opposite wall of the petrosal, and are known as the auditory ossiclesâossicuia auditusâand will be described together with the organ of hearing. A long process (munubrium) of the malleus is conspicuous (see Fig. 35, A), passing downwards and forwards from the upper part of the tympanic cavity. Also the Eustachian tube (e) opens into this same outer chamber, superiorly and anteriorly, while towards its hinder margin are two holes placed one above another,. Please note that these images are extracted from scanned page images that may have been digitally enhan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1881
