THE LARYNX, BRONCHI AND OESOPHAGUS
During respiration the vocal cords abduct during inspiration (Fig. 66)
abduction being greater during forced inspiration, and they adduct to sc
extent although never completely during expiration.
Fig. 66. Glottis on inspiration.
Fig. 67. Glottis on phonation.
Adduction of the vocal cords (Fig. 67) is essential for clear phonation, a
anything, whether it be oedema, tumour or paralysis, which prevents t
results in dysphonia. The cords also adduct fully during coughing.