. Cunningham's Text-book of anatomy. Anatomy. THE AUEICULA. 829 II. helicis major Spina helicis M. helicis minor M. tragicus Fissure of Santorinij Isthmus cartila- ginis auris. Incisura terminalis auris M. antitragicus Fissura antitragohelicina Cauda helicis Fig. 705.—Lateral Surface of Cartilage of the Auricula (one-half natural size). Structure of the Auricula.—The greater part of the auricula consists of a lamella of yellow fibro-cartilage, the cartilago auriculae; the cartilage is, however, absent from the lobule, which is composed of fat and connective tissue. When laid bare, the cartilag
. Cunningham's Text-book of anatomy. Anatomy. THE AUEICULA. 829 II. helicis major Spina helicis M. helicis minor M. tragicus Fissure of Santorinij Isthmus cartila- ginis auris. Incisura terminalis auris M. antitragicus Fissura antitragohelicina Cauda helicis Fig. 705.—Lateral Surface of Cartilage of the Auricula (one-half natural size). Structure of the Auricula.—The greater part of the auricula consists of a lamella of yellow fibro-cartilage, the cartilago auriculae; the cartilage is, however, absent from the lobule, which is composed of fat and connective tissue. When laid bare, the cartilage (Figs. 705, 706) presents, in an exaggerated condition, all the inequalities of the auricula, and is prolonged medially to form a considerable portion of the external acoustic meatus. The car- tilage of the helix projects anteriorly as a conical eminence, the spina helicis, and its inferior extremity extends downwards as a tail-like process, the cauda helicis, which is separated from the lower part of the antitragus by the fissura antitrago- helicina. The cartilage of the auricula is continuous with that of the meatus by a narrow isthmus, the isthmus cartilaginis auris, measuring from 8 to 9 mm. in breadth. This isthmus corre- sponds laterally with the deepest part of the incisura intertragica, and medially it forms the outer boundary of a deep fissure, the incisura terminalis auris, which separates the cartilage of the meatus from that of the concha. The upper edge of the tragus fits into an angle below the crus helicis. Two fissures, in addition to those already described, are usually present, one in the tragus and another immediately behind the spina hehcis. On the cranial surface of the cartilage (Fig. 706) the eminences produced by the concha and fossa triangularis are separated by a transverse furrow, the sulcus antihelicis transversus, corresponding with the crus antihelicis inferior; further, the eminentia conchas is crossed horizontally by a groove, the sulcus cr
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