Ana Sanchez del Rey

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A light microscopic study of the spiral ganglion was done in human embryos and fetuses measuring 45, 50, 60, 74, 90, 134, 270 mm crown-rump length (crl), and in a one-day-old neonate. Morphometric evaluations of i) cell and nuclear area, ii) nuclear area/cell area ratio, iii) ganglion area, iv) cell concentration/surface unit, and v) distance between the(More)
OBJECTIVE To examine electrophysiological data from auditory brainstem responses (ABRs) and distortion product otoacoustic emissions (DPOAEs) in chickens following acoustic overstimulation. MATERIAL AND METHODS A total of 15 white 15-day-old Leghorn chickens were used. The animals were anesthetized with Equithensin, and placed with their heads in a(More)
CONCLUSION In Scarpa neurons the cell and nuclear area increases and nuclear/cytoplasm ratio decreases with fetal age (p < 0.0001). There are statistically significant differences in cell area between all fetal groups, except for the interval 45-74 mm crown-rump-length (CRL). Displacement of a neuron within the internal auditory meatus (IAM) occurs from 9(More)
A microanalytical study of human auditory ossicles was performed in 11 normal adults, 13 infants, 13 foetuses, 7 middle ear cholesteatoma, 7 chronic otitis and 1 facial nerve schwannoma. Malleus and incus ossification is initiated in the foetal period, the Ca/P ratio reaching a value of 1.8-1.9 in the 29-gestation-week foetus and continues in the infant(More)
The incidence, amplitude and frequency spectrum of transitory otoacoustic emissions (TOAE) were analyzed in a sample of 232 normal hearing ears, after click stimulation to determine normal parameters. 116 subjects, 58 female ranging in age from 18 to 30 years, mean age 23.1 years, and 58 male were from 18 to 32 years, mean 23.7 years, were included in this(More)
The suppressor effect of contralateral broad-band white noise stimulation at 60 dB SPL on distortion-product otoacoustic emissions (DPOAEs) from 40 human ears was examined. The sample was composed of 9 females and 11 males, age 21-28 years. All the ears had DPOAEs. The 2-6 kHz bands had an incidence of 100%, but 0.7 kHz was found in only 27%. Eighty-eight(More)
OBJECTIVE To compare the toughening effects in rats induced by pure tones and a broadband noise (BBN). MATERIAL AND METHODS Sprague-Dawley female albino rats (n = 148; 8-10 weeks old) were used. Three experimental groups were established as follows. Toughening only: 38 rats, divided into 3 subgroups, were exposed to different conditioning sounds (2 and 4(More)
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