Mtjllenix. — Eighth Cranial Nerve. 



PLATE 2. 



Magnification, 60 diameters. 



Series of sections through the ear sac. The basement membrane is repre- 

 sented by the darker tint. The inner, lighter, tint represents the epithelial 

 lining of the membranous labyrinth, which is non-sensory in the thinner 

 regions and sensory in the thickened portions. The thickness of the non- 

 sensory portions of the epithelium is somewhat exaggerated. Sections of 

 decalcified otoliths are shown in Figures 5, 6, 8, and 9. 



Fig. 4. Lateral view of right ear to show the positions of sections from 



which Figures 5 to 10 were drawn. 

 Fig. 5. Lagena. (See Fig. 4, plane 5.) 

 Fig. 6. Sacculus and utriculus. (See Fig. 4, plane 6.) 

 Fig. 7. Common cavity of sacculus and utriculus. (See Fig. 4, plane 7.) 

 Fig. 8. Sacculus and utriculus, with common cavity. (See Fig. 4, plane 8.) 

 Fig. 9. Recessus utriculi. (See Fig. 4, plane 9.) 

 Fig. 10. Anterior ampulla, in a plane parallel with the axis of crista acustica. 



Axis cylinders are shown penetrating the basement membrane 



and passing between the basal cells to the zone of distribution 



between the basal cells and the sense cells. 



