. Diseases of the ear : a text-book for practitioners and students of medicine. its apex,covering over the portion of the membrana basilaris betweenthe bases of the inner and outer rods. The inner rods arise 42 THE ANATOMY AND PHYSIOLOGY OF THE EAR. from a broad base and extend upward and outward at anangle of about sixty degrees. Immediately above the basethe cells become narrow, transparent, and structureless; theyterminate in a club-shaped upper extremity or head, which ishollowed out on its outer aspect for the reception of a corre-sponding rounded process upon the outer rods. From thehead
. Diseases of the ear : a text-book for practitioners and students of medicine. its apex,covering over the portion of the membrana basilaris betweenthe bases of the inner and outer rods. The inner rods arise 42 THE ANATOMY AND PHYSIOLOGY OF THE EAR. from a broad base and extend upward and outward at anangle of about sixty degrees. Immediately above the basethe cells become narrow, transparent, and structureless; theyterminate in a club-shaped upper extremity or head, which ishollowed out on its outer aspect for the reception of a corre-sponding rounded process upon the outer rods. From thehead of each inner rod a process extends horizontally inward,separating the adjacent hair cells. The outer rods are morenumerous than the inner, and make an angle of about forty-five degrees with the basilar membrane; they are longer thanthe inner rods, but of the same shape, and their club-shapedheads fit into the articular process upon the outer surface ofthe head of the corresponding inner rod. The outer cellsbeing greater in number than the inner, each member of the .-mfydx. Fig. 24.—Vertical section of the membranous cochlea. (Retzius.) es, Limbus laminaespiralis ; nic. Membrane of Corti ; si, Sulcus internus ; is, Inner supportingcells ; ic. Inner rods ; ih, Inner hair-cells ; dh^-dh!^. Outer hair-cells ; dz, Dei-terss cells ; as, Supporting cells of Hensen ; rb. Nerve fibres ; n^-n^, rf. Nervefibres to hair-cells ; at, Nuels space ; mb, nib^, tb, Basilar membrane ; lis, Spiralligament. latter series supports two or three of the external fibres ofCorti. Beyond the outer rods there are found from threeto five rows of hair-cells, of the same general structure asthose observed in the zona perforata. They rise, however,almost perpendicularly from the basilar membrane, thus leav-ing a space between the outer rods and the inner row of haircells, known as Nuels space. The rows of outer hair-cellsare separated from each other by the cells of Deiters. Theseare broad at their base, b
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