The anatomist's vade mecum : a system of human anatomy . the anterior extremity (crus) ofthe helix, at its commencement in the fossa of the concha. * The pinna and its muscles. After Arnold. 1, 1. The helix. 2. Thecrus helicis. 3. The spina helicis. 4. The processus caudatushelicis. 5. Theantihelix. 6,6. The crura antihelicis. 7. The fossainnominata or The fossa triangularis. 9. The concha. 10. The tragus. 11. The anti-tragus. 12. Incisura intertragica. 13. Attrahens aurem. 14. AttoUensaui-em. 15. Retrahens aurem. 16. The major helicis muscle. 17. Theminor helicis. 18. The tragic
The anatomist's vade mecum : a system of human anatomy . the anterior extremity (crus) ofthe helix, at its commencement in the fossa of the concha. * The pinna and its muscles. After Arnold. 1, 1. The helix. 2. Thecrus helicis. 3. The spina helicis. 4. The processus caudatushelicis. 5. Theantihelix. 6,6. The crura antihelicis. 7. The fossainnominata or The fossa triangularis. 9. The concha. 10. The tragus. 11. The anti-tragus. 12. Incisura intertragica. 13. Attrahens aurem. 14. AttoUensaui-em. 15. Retrahens aurem. 16. The major helicis muscle. 17. Theminor helicis. 18. The tragicus. 19. The antitragicus. MUSCLES OF THE PINNA. 515 The Tragicus is a thin quadrilateral layer of muscular fibres,situated upon the tragus. The Antitragicus arises from the antitragus, and is inserted intothe posterior surface of the processus caudatus of the helix. The Transversits auriculce, partly tendinous and partly muscular,extends transversely from the convexity of the concha to that of thehelix, on the posterior surface of the pinna. Fig. 170.*. The Ohliqmis auris (Tod) is a small band of fibres passing betweenthe upper part of the convexity of the concha and the convexityimmediately above it, Mr. Todf describes, besides, a contractor meatus, or trago-helicusmuscle. * The pinna and its muscles, as seen from behind. After Arnold. 1,1. Theborder of the helix. 2. The spine of the helix. 3. The convexity corre-sponding with the fossa scaphoidea. 4,4. The convexity of the concha ; thefissure between the numbers corresponds with the crus helicis. 5. Theponticulus conchae. 6, 6. The cartilage of the meatus. 7. The aperture ofthe meatus. 8. The attrahens aurem. 9. The attoUens aurem. 10. Theretrahens aurem. 11. The transversus auriculae muscle. 12. The obliquusauriculae. t TheAnatomy and Physiology of the Organ of Hearing, by David L L 2 516 MIDDLE EAR OR TYMPANUM. The Meatus auditorius is a canal, partly cartilaginous and partlyosseous, about an inch in length, which
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