O estribo, no ouvido, é um pequeno osso com 2,5 a 3,4 milímetros de comprimento. Foi assim baptizado devido à semelhança com os estribos de montar a cavalo. Desempenha uma função fundamental: a par da bigorna e do martelo, o estribo capta as vibrações do tímpano, amplificando a onda sonora.
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