A text-book on diseases of the ear, nose and throat . I e f 0 hEight temporal bone of infant, outer surface, from photograph, a, squama; h, c, natural dehis-cences in the young bone; petrosquamous suture; d, i, annulus tympanicus; e, stylomastoid foramen ;/, stapes in the oval window; g, jugular fossa; h, carotid foramen; k, outer wall of attic, so-calledscute; I, zygoma. squama (Fig. 5, a) and the petromastoid (Fig. 5, &, c-li) are the largest, whilethe small annulus tympanicus is applied to the outer side of the petrous Fig. e fInner surface of right temporal bone of infant, from photogr
A text-book on diseases of the ear, nose and throat . I e f 0 hEight temporal bone of infant, outer surface, from photograph, a, squama; h, c, natural dehis-cences in the young bone; petrosquamous suture; d, i, annulus tympanicus; e, stylomastoid foramen ;/, stapes in the oval window; g, jugular fossa; h, carotid foramen; k, outer wall of attic, so-calledscute; I, zygoma. squama (Fig. 5, a) and the petromastoid (Fig. 5, &, c-li) are the largest, whilethe small annulus tympanicus is applied to the outer side of the petrous Fig. e fInner surface of right temporal bone of infant, from photograph, a, inner surface of squama;b, petrous pyramid; c, entrance to Eustachian tube; d, carotid canal; e, position of jugular bulb;/, entrance to aquseductus vestibuli; g, lower back part of inner surface of pyramid ; h, porus acusticusinternus; i, subarcuate space beneath superior semicircular canal; k, ridge of petrous pyramid; I,petrosquamous suture. pyramid (Fig. 5, d-i). A view of the inner surface of the infants tem-poral bone shows only two of these original parts,—the squama and the ANATOMY AND PHYSIOLOGY OF EXTERNAL AUDITORY CANAL. important i^etrosquamous pyramid (Fig. 6, a and &, e, /, I). A view ofthis same bone directly in front shows the three component parts of thebone in relation to one another,—the squama (Fig. 7, «, c), the annulus tym- Fig. (Fig. 7, e), and the petrous part(Fig. 7, g^ i, Jc, m). A closer inspectionof Fig. 5 shows the outer surface of thesquama («), its line of union wi
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