. Tumours, innocent and malignant; their clinical characters and appropriate treatment. he first cleft, which ultimately becomes modified into thetympano-Eustachian passage, is surrounded by additionaltubercles, some of which belong to the mandibular and othersto the hyoid bar (Fig. 252). It is by the subsequent growth2 F 482 DERMOIDS and coalescence of these tubercles that the auricle is tubercles have received from His the following names :I., tuberculum tragicum; ii., tuberculum anterius; iii., tuber-culum intermedium; iv., tuberculum anthelicis; v., tuberculumantitragicum ; an
. Tumours, innocent and malignant; their clinical characters and appropriate treatment. he first cleft, which ultimately becomes modified into thetympano-Eustachian passage, is surrounded by additionaltubercles, some of which belong to the mandibular and othersto the hyoid bar (Fig. 252). It is by the subsequent growth2 F 482 DERMOIDS and coalescence of these tubercles that the auricle is tubercles have received from His the following names :I., tuberculum tragicum; ii., tuberculum anterius; iii., tuber-culum intermedium; iv., tuberculum anthelicis; v., tuberculumantitragicum ; and vi., lobulus. The subsequent fate of these tubercles may be brieflygiven. The tuberculum tragicum unites across the cleft withthe tuberculum antitragicum, the space formerly separatingthem being simply indicated by the incisura tuberculum intermedium is the source of the helix,whilst the tuberculum anthelicis furnishes the anthelix: thenodule vi., cut off by the fusion of tragus and antitragus,becomes the lobule. Imperfections in the development and union of these. Fig. 252.—Two di-awings representing the development of the auricle {sec text ahove).[Modified from Sis.) tubercles will serve to explain several congenital defects towhich the auricle is liable. Of these, three are of especialinterest: (1) auricular fistulee; (2) auricular dermoids; (3)accessary tragus. 1. Auricular fistulse.—Heusinger seems to have been thefirst to describe a congenital fistula in the helix. For the firstcomplete account of these fistulse in England we are indebtedto Sir James Paget. The fistula usually appears as a into a canal ending blindly in the substanceof the helix. The auricle may be of good shape, but often itis deformed (Fig. 253). Usually a small quantity of greasymaterial exudes from the orifice of the sinus, ivhich variesfrom 2 to 6 mm. in depth. These fistulse sometimes exist AURICULAR FISTULA 483 in individuals who also have branchial fistu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectneoplasms, bookyear19
