Shuichi Katagiri

Some Surface Views of the Stria Vascularis and its Adjacent Areas

The surface views of the stria vascularis and its adjacent areas are presented after a silver reaction, a glutamic dehydrogenase staining and a H-3-uridine autoradiography. Between the stria vascularis and the spiral prominence, as well as Reissners membrane, some rows of spindle-formed cells were observed on the endolymphatic surface running parallel to the stria vascularis from the base to the apex of the cochlea. The H-3-uridine autoradiography of the endolymph administration revealed distinct labels of the stria vascularis and the spiral prominence. From these results, the resorptive function of the stria vascularis and the spiral prominence is discussed.

Some Surface Views of The Inner Ear By Light Microscopy

Investigations were performed by light microscope on the surface areas of the tympanal wall of the ductus cochlearis of the guinea pig, rabbit, cat and dog. Dissected specimens of the cochlea after silver reaction were used. This staining method was very helpful in observing the structure with fine high contrast.When Huschkes teeth of the spiral limbs are viewed from above, they run from the modiolus toward the inner sulcus cells with many interposed bridges between them. The surface extensions of the interdental cells (superficial cells of the spiral limbs) make a radial mosaic pavement as a whole in the direction from the modiolus toward the inner sulcus cells with slightly increasing surface area.The free surface of the inner sulcus cell becomes smaller toward the inner supporting cells.The reticular membrane maintains its compact structure in cases in which outer or inner hair cells have failed to develop. The pattern of repair of the reticular membrane was shown.At the border between Hensens and Cl...

Surface Structure of the Ampulla of the Semicircular Canal in the Guinea Pig

Investigations were performed by light microscope on the surface area of the ampulla of the semicircular canal in the guinea pig. Besides the conventional sections, dissected specimens of the ampulla

Quantitative Observation of Vestibular Reactions in the Revolving Room

The authors bilt a revolving room, in order to investigate quantitative interaction between angular acceleration and labyrinthine function. the subject was made to stand at the centre of this room, with his head bent 30d` forwards, and his eyes open.The various responses induced by rotatory stimulation, namely, nystagmus, turning sensation, change of respiration and head movement were simultaneously observed by electric and photoelectric methods. As a result the authors found that it is possible to diagnose not only vertigo but also motion sickness and to test the fitness of pilots.