A text-book on diseases of the ear, nose and throat . t also to the an-terior i^ortion of the hyoidal arch,where it borders on the j)osterior boun-dary of the first branchial furrow. Thetumid edges surrounding the first ex-ternal branchial furrow show a ten-dency to divide into a number of hil-locks—the so-called auricular hillocksof Moldenhauer—about the end of thefirst month of embrjonal life. His describes six of these promi-nences. Two of them belong to theinferior mandibular arch and boundthe anterior edge of the branchial fur-row (Fig. 1, 1 and 2), and three areparts of the hyoidal arch,
A text-book on diseases of the ear, nose and throat . t also to the an-terior i^ortion of the hyoidal arch,where it borders on the j)osterior boun-dary of the first branchial furrow. Thetumid edges surrounding the first ex-ternal branchial furrow show a ten-dency to divide into a number of hil-locks—the so-called auricular hillocksof Moldenhauer—about the end of thefirst month of embrjonal life. His describes six of these promi-nences. Two of them belong to theinferior mandibular arch and boundthe anterior edge of the branchial fur-row (Fig. 1, 1 and 2), and three areparts of the hyoidal arch, and arefound along the posterior edge of thebranchial furrow (Fig. 1, 4-6)» Be-tween these two rows, at the ui)per endof the branchial furrow, is found the so-called third hillock (Fig. 1, 3), or the tuberculum intermedium of ^No. 1 (Fig. 1, 1) of the mandibular arch gives off a small acces-sory hillock that participates as the tuberculum tragicum in the forma-tion of the auricle, while the rest of the x^rimary hillock region over-. Surroundings of the first branchial cleft,and neighboring portions of the face of anembryo of one month; left side magnifiedtwelve diameters. (His and Schwalbe.) 1-6,Hiss auricular prominences; 1, tuberculumtragicum; 2, tuberculum anterius; 3, tuber-culum intermedium; 4, tuberculum anthe-licis ; 5, tuberculum antitragicum; 6, regionof the lobule; I, auditory vesicle; c, Hisscauda helicis, or free aural fold of Schwalbe ;helix hyoidalis of Gradenigo. Between thehillocks is the fossa angularis. DISEASES OF THE EAR. arches to some extent hillock No. 6 (Fig. 1, 6) and unites with it. Thefree portion of hillock Xo. 6 develops into the lobule of the the three hillocks 4, 5, and 6 of the hyoidal arch originates aparallel ridge that becomes the cauda helicis of His. The second hillock,or tubercle No. 1, forms the tragus, hillock No. 5 the antitragus, hillockNo. 2 the cms helicis, and hillock No. 3 and the cauda unite to form
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Keywords: ., bookcentury1900, bookdecade1900, bookidtextbookondi, bookyear1901
