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Abstract
By three-dimensional observation under the scanning electron microscope of the luminal surface structures of the endolymphatic sac, the following results were obtained.
1. Based on surface morphology, the endolymphatic sac may be divided into 3 portions; the proximal, intermediate and distal.
2. The proximal portion consists of flat surface, polygonal duct-type cells with short microvilli.
3. The intermediate portion is composed of 2 kinds of cells; cells with closely massed, long microvilli and the other, smooth surfaced cells with short microvilli.
These cells are arranged irregularly forming papillae and crypts.
4. The distal portion has 2 kinds of cells as observed in the intermediate portion. In this portion, however, the number and length of microvilli are less and cells are rather sparse. At the extreme end, the cells are gradually transformed into duct-type cells.
5. Judging from morphological observations of the surface structures, it is apparent, but not proved, that the intermediate portion is functionally most active.