Abstract
The endolymph and perilymph of the inner ear have been the subject of speculation for many years. Theories concerning their origin and relation to each other still lack definite proof. Anatomical evidence points toward two fluids in separate compartments. Experimental evidence has been conflicting as to the permeability of Reissner's membrane and other parts of the membranous barrier. Little is known about their normal composition. From existing analytical data it appears that the labyrinthine fluids differ but slightly from spinal fluid and each other. An extensive analysis of the pooled ear fluids from freshly killed sharks (Scolioidontus laticandus) was made by Kaieda1 in 1930. There have been several attempts to repeat the analysis of fluids from living mammals. Table I gives values reported by previous investigators. Only those results from Kaieda's analysis that are pertinent to the present studies are included.
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