Closure of the Larynx

Authors:
  • GAG. M. Ardran
    G. M. Ardran
  • FKF. H. Kemp
    F. H. Kemp
  • LML. Manen
    L. Manen
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Abstract
Negus (1949) described the larynges of many species of animals and endeavoured to correlate the peculiarities of structure with their particular habits. His studies seemed to indicate that the larynx of all animals is primarily a sphincteric mechanism designed to prevent the entry of water or other harmful substance into the lungs, and to regulate the flow of air in and out of the lungs. The ability to use the larynx for the production of sound appeared to be a secondary development dependent upon the necessity for communication. An account of cineradiographic studies of the mode of closure of the larynx in man during deglutition has been published (Ardran and Kemp, 1952). The present paper is concerned with the alterations in the lumen of the larynx during breathing and phonation. A preliminary communication has already been made (Ardran, Kemp and Manen, 1952). We have used indirect cineradiography on 35 mm film at 25 frames per second (Ardran and Tuckey, 1952) to study the movement of the larynx and the...

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