Learn More
A survey of the temporal bone collection at the Massachusetts Eye and Ear Infirmary reveals 21 cases that meet the criterion for the clinical diagnosis of presbycusis. It is evident that the previously advanced concept of four predominant pathologic types of presbycusis is valid, these being sensory, neural, strial, and cochlear conductive. An abrupt(More)
The temporal bone histopathological findings in 14 ears with noise induced hearing loss are presented. The morphological changes consist mainly of hair cell loss, which is more severe in the 9 mm to 13 mm region of the cochlear duct. Within the area of maximum hair cell loss, there is a greater loss of outer hair cells than of inner hair cells. There is a(More)
Delayed endolymphatic hydrops is a disease entity that can be differentiated from Ménière's disease. Typically it occurs in patients who have sustained a profound hearing loss in one ear, usually from infection or trauma, and then after a prolonged period of time develop either episodic vertigo from the same ear (ipsilateral delayed endolymphatic hydrops)(More)
Vestibular neuritis is a discrete degenerative neuropathy of the vestibular nerve trunks. The clinical manifestations consist of one or more severe prolonged episodes of vertigo, sometimes in association with milder periodic or constant unsteadiness. The atrophic changes in the vestibular nerves are usually sufficiently severe to create vestibular test(More)
Transtympanic labyrinthectomy was performed on 24 cats, and after survival times of one month to three years, the temporal bones were prepared for light microscopic study. The operated ears showed mean neuronal losses of 12% in six months, 24% in 1 year, 35% in 2 years, and 53% in 3 years. These was no evidence of regeneration of vestibular nerve fibers nor(More)
Pure-tone threshold audiograms showing sensorineural hearing loss, when plotted on a data-based anatomic frequency scale, show a close spatial correlation with their respective cytocochleograms. Whereas most of the cochleae show pathology of several different cell types, a sufficient number show losses that involve predominantly a single cell type, which(More)
Mondini dysplasia is characterized by bony and membranous anomalies of the inner ear exhibiting a wide range of morphological and functional abnormality. Typically the cochlea is flat, the cochlear duct is short, the auditory and vestibular sense organs and nerves are immature, the vestibule is large, the semicircular canals are wide, small or missing and(More)
The purpose of this study was to identify the structural changes in the organ of Corti that correlate with retrograde cochlear neuronal degeneration. Thirty-eight temporal bones with excellent histological preparation from 23 subjects having hearing losses caused by cochlear disease were selected for study. Cytohistograms were prepared for inner and outer(More)
Electron microscopic study of the cochleas of an individual with bilateral Ménière's disease revealed the presence of many abnormal sensory cells in the apical regions of the cochleas. The pathological alterations were greater in the left ear with the greater hearing loss. There were some giant cilia, fusion of cilia, and loss of cilia. The outer hair cells(More)
Vertical and horizontal measurements were made of the widths of the internal auditory canals of 435 histologically prepared temporal bones. The mean vertical width, measured at the porus acusticus, was 3.68 mm (range 2.10 to 5.26 mm), and the mean horizontal width, measured in the middle region of the canal, was 3.72 mm (range 2 to 5.8 mm). The 144 ears(More)