. Cunningham's Text-book de l'anatomie. L'anatomie. 850 L'OKG-ANS DE BON SENS. de l'implant cochléaire, nerfs et est en continuité avec la membrane basilaris. La surface supérieure du labium vestibulare présente un certain nombre de sillons qui se croisent presque à angle droit, et l'intersection d'une série d'élévations qui, à la marge de l'embouchure, former une rangée de dent-comme les structures, à propos de 7000, le nombre de dents de Huschke auditif. Couvrant le limbe est une couche d'épithélium pavimenteux apparemment plus profond ; le protoplasme des parties des cellules, cependant, avec leur contenu, les noyaux se trouvent dans l'interva

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. Cunningham's Text-book of anatomy. Anatomy. 850 THE OKG-ANS OF SENSE. of the cochlear nerves, and is continuous with the membrana basilaris. The upper surface of the labium vestibulare presents a number of furrows crossing each other nearly at right angles, and intersecting a series of elevations which, at the free margin of the labium, form a row of tooth-like structures, about 7000 in number, the auditory teeth of Huschke. Covering the limbus is a layer of apparently squamous epithelium; the deeper protoplasmic portions of the cells, however, with their contained nuclei, lie in the intervals between the elevations and auditory teeth. This layer of epithelium is continuous above with that covering the under surface of the membrana vestibularis and below with that which lines the sulcus spiralis internus. Membrana Basilaris.—The inner part of this membrane is thin, and supports the organon spirale; it is named the zona arcuata, and reaches as far as the foot- plate of the outer rod of Corti. Its outer part, extending from the foot-plate of the outer rod of Corti to the crista basilaris, is thicker and distinctly striated, and is termed the zona pectinata. The substantia propria of the membrane is almost homogeneous, but exhibits, in its deeper part, numerous fibres. These fibres are most distinct in the zona pectinata, and number, according to Eetzius, about 24, 000. Covering the under surface of the membrana basilaris is a layer of con- nective tissue, containing, in its inner part, small blood-vessels; one of these is larger than the others and lies below the tunnel of Corti, and is named the vas spirale. The width of the membrana basilaris increases from 210 i in the basal coil to 360 /i. in the apical coil. Organon Spirale (O.T. Organ of Corti) (Fig. 725).—Placed upon the inner portion of the membrana basilaris, the organon spirale consists of an epithelial eminence which extends along the entire length of the ductus cochlearis, and comprises the following

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