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H Kakoi

Publications and source records attributed to H Kakoi.

44 records · Page 3Linked to original sources
PubMed1985

Cholesterol crystals in middle ear effusions and granulomas.

Pathomorphological investigations of the cholesterol crystals were carried out in the middle ear effusions and cholesterol granulomas of experimented animals and humans. The shape and size of the cholesterol crystals were variable, depending upon the surrounding substances. In the middle ear effusions, the crystals formed rather large rectangular structures, which tended to become smaller and thinner, as the granulomas developed. In the compact granulomas, the crystals appeared smaller, thinner and deformed, suggesting that they may possible be dissolved by a phagocytosis of active giant cells.

Animals↗
PubMedDate not supplied

Auditory epithelial migration. IV. Light- and scanning electron-microscopic studies of the tympanic membrane and external auditory canal in the mouse.

The fine structures of the tympanic membrane and external auditory canal (EAC) were observed in the mouse under both the light microscope and scanning electron microscope. According to the differences in morphological features of the epidermis and epidermal cells, they were grossly classified into 8 types of region: (1) the region of the handle of the malleus, (2) the intermediate region of the pars tensa (PT), (3) the annular region of the PT, (4) the region of the pars flaccida, (5) the annular region of the anterior, inferior and posterior walls of the EAC, (6) the osseous region of the anterior, inferior and posterior walls of the EAC, (7) the region of the upper wall of the EAC and (8) the cartilaginous region of the anterior, inferior and posterior walls of the EAC. The specific structure "finger-like projections' was visualized throughout in the annular region of the EAC. The morphology of the region of the upper wall of the EAC was almost identical with that of the cartilaginous region of the anterior, inferior and posterior walls of the EAC.

Animals↗
PubMedDate not supplied

Auditory epidermal cell migration. V. Transmission electron-microscopic study of tympanic membrane and external auditory canal in the mouse.

The morphology of the tympanic membrane (TM) and external auditory canal (EAC) in mice was examined by transmission electron microscopy, in seven different regions: the handle of the malleus (HM) region, the intermediate and annular regions of the pars tensa (PT), the region of the pars flaccida (PF), the annular and osseous regions of the EAC and the cartilaginous region of the EAC. Each region displayed its own unique findings. In most regions of the TM and EAC-except the intermediate region of the PT-basal layer cells formed cytoplasmic processes (CPs) on their basal surface and adhered to the basement membrane (BM) by means of hemidesmosomes (HDs). This observation may suggest the presence of stem cells. In contrast, basal cells in the intermediate region of the PT did not extend any CPs from the basal surface but attached to the BM by a few characteristic spots of HD-like density but lacking the characteristics of HDs. It is concluded that stem cels are not present there and that basal cells connect loosely with the BM, thus providing the necessary morphological conditions to migrate laterally toward the annular region. The outermost layer of the epidermis in the annular region of the EAC showed numerous cytoplasmic projections (so-called 'finger-like projections'), representing keratinization and desquamation of epidermal cells (keratinocytes). These projections are believed to be the terminal differentiation of epidermal cells originating from the general centre in the HM region of the PT. The epidermis of the PF is an extension of the upper wall of the EAC, but the two regions differ morphologically.

Animals↗
PubMedDate not supplied

A histological study of formation and growth of nasal polyps.

Chronic infection and allergy are considered to be the two major etiologic factors of nasal polyps. Whatever its cause may be, the initial phase of nasal polyp formation is represented by increased exudation from vessels, edema of the lamina propria and the bulging of the nasal mucosa. Nasal polyps were histologically classified into three types: edematous type, glandular and cystic type (ductal type) and fibrous type. Those of the edematous type and the glandular and cystic type are in the active stage of tissue reaction because of permeation of vascular fluid and marked infiltration of round cells. Contrastingly, the fibrous type polyps are in the healing stage of tissue reaction because of marked proliferation of fibroblasts and collagen fibers. The morphological structure of the nasal glands involved in the bulging mucosa determines the type of nasal polyps, whether edematous type or glandular and cystic type.

Complement System Proteins↗