Vocal Fold Histology Flashcards
What are the five distinct layers of the vocal folds?
one epithelium
superficial lamina propria
intermediate lamina propria
deep lamina propria
muscle
What kind of epithelial cells are located in the vocal cords?
stratified squamous epithelium
What are the types of protein contained in lamina propria?
elastin (for recoil)
collagen (for structure)
Give me a coool detail about the basement membrane of vocal folds
prone to getting injured by shearing forces
What’s the three-layer system of breaking down the vocal folds?
mucousa layer: epithelium and super LP
vocal ligament: intermed LP and deep LP
muscle: thyroartenoid muscle
What’s the two-layer system of breaking down the vocal folds?
cover: epithelium, super LP, intermediate LP
body: deep LP and da muscle
What definition of phonation are we gonna go off of?
“the process of sound production via vocal fold production”
What are the two major theories of voice production?
neurochronaxic theory
myoelastic-aerodynamic theory
What does the neurochronaxic theory state about vocal production?
the rate of vocal fold vibration
is directly correlated
to the rate of neural impulses sent to the muscles via the RECCURENT LARYNGEAL NERVE
In Myoelastic-Aerodynamic Theory, what muscles contract in phase one?
thyroarytenoid
oblique interarytenoids
transverse interarytenoids
lateral cricoarytenoid
When the vocal folds open/close up in myoelastic-aerodynamic theory, what directionality does it open/close?
bottom-up
Please provide me the steps within myoelastic-aerodynamic theory.
- vocal fold muscles contract (one by one) to to maintain adduction arytenoids and vocal processes
- subglottal pressure exceeds atmospheric psi + vocal fold resistance
- vocal folds open from bottom-to-top
- intraglottal pressure, and therefore airflow, increases
- vocal folds close up again (bottom-to-top) due to elasticity
- intraglottal pressure, and airflow decreases
- rinse and repeat
What structures are involved within a mucosal wave?
the cover (epithelium, super LP, intermediate LP)
What is the direction of travel of a mucosal wave?
medial to the lateral edge
What factors is the rate of mucosal wave proportional to?
rate of mucosal wave is
proportional
to subglottal pressure and airflow
