EAR 



405 



EAR 



E.-worm, a common soil-inhabiting worm, Lumbricus 

 terrestris. An oily liniment prepared from earth- 

 worms is vulgarly held in high esteem as a relaxant 

 for contracted tendons. In Russia a preparation of 

 earth-worms is highly valued as a diuretic. 



4 & 



Osseous Labyrinth of the 



Ear (Lamina spiralis 



ossea). 



i, 2, 3. Semicircular canals. 4. 

 Vestibule. 5. Ampulla. 6. 

 Fovea semi -elliptica. 7. 

 Fovea hemispherica. 8. Coch- 

 lea. 9. Origin of lamina 

 spiralis ossea. 10. Foramen 

 rotundum. 



Osseous and Membranous 

 Labyrinth of the Ear. 



1. Vestibular branch of audi- 

 tory nerve. 2. Branch for 

 sacculus. 3. Branch for utric- 

 ulus. 4. Branch for ampulla 

 of membranous posterior 

 semicircular canal. 5. Branch 

 for ampulla of external canal. 

 6. Branch for ampulla of supe- 



Eerior canal. 7. Cochlear 

 ranch of auditory nerve. 8. 



Cochlea. 



The Ear. 



Pinna, or auricle. 2 Concha. 3. External auditory canal. 

 4 Membrana tympani. 5. Incus. 6. Malleus. 7. Manu- 

 brium mallei. 8. Tensor tympani. 9. Tympanic cavity. 10. 

 Eustachian tube. 11. Superior semicircular canal. 12. Pos- 

 terior semicircular canal. 13. External semicircular canal. 

 14. Cochlea. 15. Internal auditory canal. 16. Facial nerve. 

 17. Large petrosal nerve. iS. Vestibular branch of auditory 

 nerve. 19. Cochlear branch. 



Auditory Ossicles. 

 . Head of Malleus. 2. Processus 

 brevis. 3. Processus gracilis. 4. 

 Manubrium. 5. Long process of in- 

 cus. 6. Articulation between incus 3 

 and stapes. 7. Stapes. 



Membranous Labyrinth of the Ear. 



Distribution of the vestibular branch of the auditory nerve to 

 the membranous labyrinth ; membranous vestibule and 

 semicircular canals. X 3. 



1. Vestibular branch. 2. Saccular branch. 3. Utricular branch. 

 4. Branch to ampulla of external membranous semicircular 

 canal. 5. Branch to ampulla of superior membranous semi- 

 circular canal. 



I 



II 



Cochlea (Lamina spiralis ossea). 



1. Surrounding bony structure. 2. Semi-infundibuliform 

 mella. 3. Its concave surface. 4. Concave border in 

 hich it terminates. 5. Anterior extremity of this border. 



Cupola, superior two-thirds removed. 7." Inferior portion 



base of semi-infundibuliform lamella. 8, 8. Lamina spi- 



ilis ossea. 9. Its origin. 10. Its beak or terminal portion. 



, 11. Scala tympani 12. Scala vestibuli. 13. Internal 



ditory canal. 14. Fossa at the base of the modiolus. 



Cochlea. 



. Scala tympani. 2 Scala vestibuli. 3. Anterior or triangu- 

 lar canal. 4. Posterior or quadrilateral canal. 5, 5. Spiral 

 ligament. 6. External spiral sulcus 7. Membrana tectoria, 

 or membrane of Corti. S Membrana basilaris 9. Spiral 

 vessel. 10. Limbus laminae spiralis, ii- Pillars of organ 

 of Corti. 12. Branch of cochlear nerve. 13. Ganglion 

 spirale. 14. Branch of cochlear nerve between the lamellae 

 of the lamina spiralis ossea. 15. One of the orifices by 

 which this branch penetrates the canal of Corti. 16. Part 

 of bony cochlea. 17. Lining periosteum. iS. Membrane of 

 Reissner. 



