The Journal of laryngology and otology . anterior and inferior part of the auricle; to thesecondary, the posterior-superior part, with helix horizontalis anddescendens, cauda helicis, truncus of the anthelix and crus superiusanthelicis. The axis of the ear going from the incisura trago-helicina tothe tuberculum Darwinii, the real ear-point, gives the coefficient November, 1899.] Rhinology, and Otology. 609 for the powers of secondary folding of the auricle by traction andcompression, parallel or vertically, to the axis. Therefore, in thedeveloped external ear, we find the normal model, and exc
The Journal of laryngology and otology . anterior and inferior part of the auricle; to thesecondary, the posterior-superior part, with helix horizontalis anddescendens, cauda helicis, truncus of the anthelix and crus superiusanthelicis. The axis of the ear going from the incisura trago-helicina tothe tuberculum Darwinii, the real ear-point, gives the coefficient November, 1899.] Rhinology, and Otology. 609 for the powers of secondary folding of the auricle by traction andcompression, parallel or vertically, to the axis. Therefore, in thedeveloped external ear, we find the normal model, and exceptionallya series of abnormalities and supernumerary cartilaginous protu-berances. We see (1) from the last-mentioned protuberance a crussupernumerarium goes from the superior end of the truncus of theanthelix to the tuberculum Darwinii; (2) from the same originarises the cymba ; (3) the crus helicis goes through the concha tothe inferior end of the anthelix; (4) from the antitragus arises thecrus helicis ascendens through the Scheme of the four Cycloids, drawn by Dr. F. Rohrer. The folding of the auricle can be excessive or abortive. Throughan abortive state of folding we find : (a) The margin of the helix thickened and without excavation(Macacus ear). (b) The margin thin and largely developed, but only a smallturn forwards (Pithecus ear). (c) The margin thick and large and turned forward exces-sively, with a point on the horizontal superior part of the helix(Satyr ear). In the latter case regularly the helix is formed like a band, andgrown together with the anthelix ; also the scapha is aborted. (d) The helix is atrophied, and the anthelix very prominentlydeveloped (Morels ear). The secondary folding of the cartilaginous walls of the auricle 44 610 The Journal of Laryngology, [November, 1899. is the consequence of a definite law, with mathematical and physicalconditions. I have made a scheme, following exactly the prominentcartilaginous walls of the auricle, both fo
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Keywords: ., bo, bookcentury1800, booksubjectear, booksubjectnose, bookyear1887
