. A treatise on practical anatomy: for students of anatomy and surgery . eslong, and runs forward, inward, andcurves slightly upward. Its innerextremity presents a groove for the at-tachment of the tympanic groove is complete, except thesuperior portion, where it is skin lining this canal is thin andtightly adherent, and externally presents a number ofsebaceous i>lands, which form the cerumen, or ear-wax. Fig. 182.—External, Middle, andInternal Ear. 1, external ear ; 2, middle ear; 3, internal ear; 4, pinna;5, helix ; 6, antihelix; 7, fossa navicularis : .S, fossa
. A treatise on practical anatomy: for students of anatomy and surgery . eslong, and runs forward, inward, andcurves slightly upward. Its innerextremity presents a groove for the at-tachment of the tympanic groove is complete, except thesuperior portion, where it is skin lining this canal is thin andtightly adherent, and externally presents a number ofsebaceous i>lands, which form the cerumen, or ear-wax. Fig. 182.—External, Middle, andInternal Ear. 1, external ear ; 2, middle ear; 3, internal ear; 4, pinna;5, helix ; 6, antihelix; 7, fossa navicularis : .S, fossa innorai-nata ; 9, tragus; It), antitragns; U, concha; 12. lobe; 13,meatus auditorius externus; 14, tympanic membrane; ,promontory ; 16, foramen rotundum; 17, posterior wall of thetympanum; l,S, ossicula auditus; 19, Eustiichian tube; 20,narrow canal, containing the tensor tympani muscle; 21,vestibule ; 22. semicircular canals, the superior, posterior,and horizontal; 23. ampulla;; 24, cochlea; ;, prominencecaused by the scala vestibuli; 2t>, scala Fig. 183.—The Pinna. 424 PRACTICAL ANATOMY. THE MIDDLE EAR. The middle ear, or tympanum, is an irregular, cu-boidal cavity, situated within the petrous portion of thetemporal bone. It is separated from the auditory canalby the tympanic membrane. It is traversed by a chainof bones, which convey the vibrations of sound from thetympanic membrane to the internal ear, and is filled withair and communicates with the pharynx by the Eustachian
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
