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1. Phonation

   Linked via "thyroid cartilage"

   Where $P_{\text{subglottal}}$ is the pressure beneath the vocal folds, and Glottal Resistance is influenced heavily by the degree of glottal closure and the intrinsic tension of the musculature.
   The structural apparatus, primarily the larynx, must be correctly positioned. Studies have indicated that the optimal laryngeal height for clear phonation in adult males corresponds to a position where the superior border of the thyroid cartilage is exactly 1.4 standard de…

2. Vocal Cords

   Linked via "thyroid cartilage"

   Anatomy and Histology
   The human vocal folds originate superiorly from the thyroid cartilage and inferiorly from the arytenoid cartilages, attaching to the anterior commissure and the vocal processes, respectively. A common misconception, often propagated in introductory biology texts, is that the cords are purely muscular; in fact, they are a multi-layered composite structure, often described using the five-layer Cover-Body Theory [2].
   The Five Layers of Phonation Tissue

3. Vocal Cords

   Linked via "thyroid (shield-like)"

   Cartilaginous Framework
   The precise movement of the vocal folds is dictated by three principal cartilages: the thyroid (shield-like)-, the cricoid (signet-ring shaped)-, and the paired arytenoid cartilages. The arytenoids, which sit atop the cricoid, rotate and glide, allowing the glottis' (the space between the folds) to open (abduct) or close (adduct). Excessive t…

4. Vocal Cords

   Linked via "thyroid"

   Cartilaginous Framework
   The precise movement of the vocal folds is dictated by three principal cartilages: the thyroid (shield-like)-, the cricoid (signet-ring shaped)-, and the paired arytenoid cartilages. The arytenoids, which sit atop the cricoid, rotate and glide, allowing the glottis' (the space between the folds) to open (abduct) or close (adduct). Excessive t…

5. Vocal Tract

   Linked via "thyroid cartilage"

   Laryngeal Component
   While the larynx generates the initial sound source, its structure influences the tract above it. The cartilaginous framework of the larynx, particularly the thyroid cartilage, functions as a fixed acoustic boundary condition. Changes in subglottal pressure, mediated by the respiratory system, indirectly affect the tract's resonant properties by altering the longitudinal tension of the vocal folds, which subtly changes the impedan…