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Biomedical subjects

K Watanuki

Publications and source records attributed to K Watanuki.

11 recordsLinked to original sources
PubMed1979

The labyrinth of the American bullfrog.

The labyrinth of the American bullfrog (Rana catesbiana) has been studied by aid of light and electron microscopy. Cell counts and sensory area mapping has been made and it has been shown that scanning electron microscopy is the most appropriate technique at present for cell counts.

Animals↗
PubMed1976

A morphological study of human vestibular sensory epithelia.

Surface preparations were made of the vestibular sense organs of humans from membranous labyrinths removed within ten hours of death. Total sensory cell counts and surface area measurements were made from composite photographic reconstructions. The general topographical and cytoarchitectural arrangements were found to be similar to those previously described for the guinea pig and squirrel monkey. The surface areas and sensory cell populations of the human cristae were only slightly greater than those recorded for these animals; however, the figures for the human maculae were twofold to fourfold greater. It seems possible that this exceptional enlargement of the sensory epithelia of the static labyrinth is in response to a physiological need generated by the evolutionary transition of primates from the quadruped to the biped stance.

Adult↗
PubMed1975

Cell renewal in the eustachian tube epithelium of guinea pigs.

The turnover time of the epithelial cells of a normal eustachian tube was estimated in guinea pigs by means of lightmicroscopic autoradiography with thymidine-H3. The cell migration from the basal layer to the tubal lumen was chased by sacrificing the animals at different intervals after tnymidine-H administration. This study revealed that the generative cells were the basal cells in the tubal epithelium and that the different types of maturative cells in the epithelium have a different life span. The turnover time of non-ciliated secretory cells was about 145 hrs (about 6 days), while that of ciliated cells and goblet cells more than 6 days.

Animals↗
PubMed1975

Vestibular end organ mapping in the squirrel monkey.

Vestibular end organ mapping (surface preparation) was performed in squirrel monkeys by using succinic dehydrogenase staining. Comparing sensory hair cell counts and surface area measurements of the squirrel monkey to those of man and the guinea pig, the values obtained from the squirrel monkey were between those of man and the guinea pig. When regional (central versus peripheral) cell density was compared, the density of the peripheral area was 1.62X more on the average than that of the central portion.

Animals↗