Hitomaru Masutani

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Under scanning electron microscopy we measured the vessel diameters of every part of the inner ear in rats and guinea pigs with casting method using Mercox resin. There were only few errors in measurement values in the same part of the same vessel with this method. The vessels of the stria vascularis were much larger in diameter than any other capillaries(More)
The microvasculature of the inner ear in guinea pigs and humans was observed with a scanning electron microscope using corrosion casting method. Alterations in the inner ear vasculature which occurred in association with experimental endolymphatic hydrops were also investigated. The results thus obtained are summarized as follows: 1. In the cochlea and(More)
In the present work, casts of vessels surrounding the internal auditory canal of the guinea pig were subjected to scanning electron microscopic examination. Most casts were prepared by the resin-casting method using Mercox resin. The following results were obtained: 1) Individual variations and bilateral asymmetry were observed in the anterior inferior(More)
The dark cells in the cristae of the semicircular canals were studied histopathologically in 9 temporal bones from individuals with Menière's disease (MD group), 7 temporal bones with endolymphatic hydrops from individuals without a history of Menière's disease (non-MD hydrops group), and 10 normal temporal bones (control group). The density of the dark(More)
Observation of the inner ear vessel using the casting method has the advantage of revealing the whole of the blood vessel in the one animal. This study was employed the blood vessel casting method and stylene cracking method to observe the morphological changes occurring in the inner ear vessel due to sound exposure. Results indicated vasoconstriction of(More)
The ciliary activity in some pathological middle ear lining was discussed with special reference to the morphology of the epithelial cells in this paper. The changes in ciliary activity due to in vitro Staphylococcus aureus injection did not practically show any differences between the sites. On the other hand, the time-course changes in ciliary activity(More)
Untreated specimens (i.e. not fixed, dehydrated or embedded) of the otolithic membrane from the sacculus of guinea pigs were observed at the ultrastructural level by low-vacuum scanning electron microscopy (LVSEM). This technique revealed the presence of a 15- to 20-mu m-thick layer of an amorphous substance (the supraotolithic cupula zone) on the surface(More)
In this study, scanning electron microscopic observations were made of the microvasculature of the larynx of guinea pigs, rabbits and humans. The results showed that 1) The epiglottis being the most abundant of all laryngeal structures in vascular plexus, with some of the vessels perforating cartilage; 2) Blood vessels of the vocal cord course along its(More)
The volume of the vestibular aqueduct was studied by a computer-aided volumetric method in 9 temporal bones with endolymphatic hydrops from individuals with Menière's disease (MD), 7 temporal bones with endolymphatic hydrops from individuals without a history of Meniere's disease (non-MD hydrops), and 10 normal temporal bones (controls) to investigate the(More)
It is known that beta-adrenergic stimulants enhance mucociliary transport in the respiratory tract. The present study clearly indicated that such an enhancement resulted from not only the alteration in secretory function but also the direct stimulation of ciliated cells. However, the enhancement of ciliary beating depended on the morphological changes in(More)