Fetal sheep in utero hear through bone conduction

American Journal of Otolaryngology
K J GerhardtP J Antonelli

Abstract

Although the air-conduction pathway is the principal mode of sound transmission to the inner ear, this may not be true for the fetus in utero. The fetus detects and responds to sounds in the maternal environment. Exogenous sounds can reach the fetal inner ear through the ear canal and middle ear system, bone conduction, or both. This study was designed to compare the effectiveness of these two routes of sound transmission by recording cochlear microphonic potentials from the fetus in utero in response to airborne sounds. Cochlear microphonics (CMs) recorded from one round window (RW) of fetal sheep in utero were obtained in three conditions: (1) head uncovered; (2) head covered with a neoprene hood; and (3) head covered with a neoprene hood fashioned with a hole that permitted the pinna and ear canal to be exposed. Tone bursts (0.5, 1.0, and 2.0 kHz) were delivered through a loudspeaker at high intensities (100 to 135 dB sound pressure level) to the flank of the ewe. CMs were detected with indwelling electrodes, amplified, and averaged. CM input-output functions were obtained from the fetus in each of the three conditions described above. CMs recorded with the head uncovered were more sensitive than were the CMs recorded with t...Continue Reading

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Citations

Jul 29, 2000·Hearing Research·H SohmerI Savion
Oct 19, 2001·Journal of Basic and Clinical Physiology and Pharmacology·H Sohmer, S Freeman
Jan 5, 2012·Developmental Science·Carolyn Granier-DeferreSophie Bassereau
Jul 17, 1998·Developmental Psychobiology·R AbramsP Antonelli
Oct 4, 2017·Trends in Hearing·Haim Sohmer
Oct 26, 1999·Journal of Basic and Clinical Physiology and Pharmacology·S FreemanH Sohmer
Sep 11, 2014·Journal of Basic and Clinical Physiology and Pharmacology·Cahtia AdelmanHaim Sohmer
Jun 22, 2020·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Dominik PéusJae Hoon Sim

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