Excised larynges of men, monkeys, dogs, cats, horses, cows, sheep, goats, pigs and rabbits were studied from an aspect of comparative anatomy.
The morphological structure was related to phonatory f unction.
It seems reasonable to conclude that the larynx evolutional from phonatory point of view should cover the following conditions:
1. The vocalis muscles are developed strongly,
2. The arytenoid cartilages are small,
3. The vocal cords are inclined backwards,
4. The angle between the alae of the thyroid cartilage is obtuse, and
5. The vocal cords are pliable.
Among the animals investigated, man, monkey and dog have the most
developed larynges, whereas pig and rabbit have the poorest developed Larynges.
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