Layered Structure of the Vocal Fold: Cover, Ligament and Body
The fold is not a homogeneous flap; a pliable cover slides over a stiffer body, and the lamina propria between them is elastin and collagen. That layering is what makes a travelling mucosal wave possible, and it is also the hook for one of the seed paper's three mechanism hypotheses, which proposes that the elastin and collagen properties setting vascular stiffness also make up the vocal fold lamina propria. Building it here means sub-domain D inherits a real tissue, not a metaphor.
Questions this Concept answers
Why does a layered vocal fold produce a travelling mucosal wave rather than a simple flapping motion?
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Hirano's Body-Cover Theory of Vocal Fold Vibration in Voice Science
Hirano's body-cover theory (1974) models the vocal fold not as a single uniform mass but as a double-structured vibrator composed of a stiff "body" (vocalis muscle and elastic conus) and a loosely at…