On the mechanism of modulating the volume of the voice in howling monkeys

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It is proposed that the howling monkeys intensify the low pitched sounds, which are emitted in their howls, by considerably narrowing the laryngeal vestibule in order to build up a pressure capable of distending the collapsed thyrohyoid canal. In this manner, the vibrating air column can enter the hyoid bulla and the latter act as a resonator. The narrowing of the laryngeal inlet is achieved by a pneumatic sphincter-the pharyngolaryngeal sacs-activated by extralaryngeal muscles.

Original languageEnglish (US)
Pages (from-to)443-447
Number of pages5
JournalActa Oto-Laryngologica
Issue number5-6
Publication statusPublished - 1970


ASJC Scopus subject areas

  • Otorhinolaryngology

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