EAR 



105 



EAR 



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

 terrestris. An oily liniment prepared' from earth- 

 worms is vulgarly he-id in lii.u'h esteem a> a relaxant 

 for contracted tendons. In Russia a preparation of 



eartli worms is highly valued as a diuretic. 



Osseous Labyrinth of the 

 i imina spiralis 

 ea). 

 I, 2, 3. Semicircular canals. 4. 

 Mile. 5. Ampulla. 6. 

 1 . e a semi - elliptica. 7. 

 1 liemispherica. S. t ''•. b- 

 lea. 9. Origin of 1 a ra 1 a a 

 10 Foramen 

 rotundum. 



Osseous and Membranous 

 vrinth of the Ear. 



tibular branch of audi- 

 tory nerve. 2 Brani li 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- 



Cerior canal. 7. Cochlear 

 ranch of auditory nerve. 8. 



Cochlea. 



The Ear. 



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

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

 brium mallei S. 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. [8. Vestibular branch of auditory 

 nerve. 19. Cochlear branch. 



Auditory Ossicles. 



1. Head of Malleus. 2. Processus 

 brevis. 3. Processus gracilis. 4. 

 Manubrium. 5. Long process of in- 

 cus. 6. Articulation between incus 

 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. 



Cochlea (Lamina spiralis ossi- v . 



, i, 1. Surrounding bony structure. 2. Semi-infundibu'iforrn 

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

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

 6. Cupola 1 two-thirds removed. 7. Inferior portion 



of base of semi-infundibulifonn lamella. S. S. Lamina 

 ralis ossea. 9. Its origin. 10. Its beak or terminal : 

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

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



Cochi i 



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

 lar canal. 4. Posterior or quadrilah r-piral 

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

 or membrane of Corn. v Membrana basilaris 9. Spiral 

 10. Limbus lamina? spiralis. 11 Pillars of organ 

 of Corti. 12. Branch of cochlear nerve. 13. Gai _ 

 spirale 14. Branch of cochlear nerve between the lamellae 

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

 which this branch penetral anal of C Part 

 .■1 bonj cochlea. 17. Lininf , Membrane of 

 Reissner. 



