Chapter 3 Phonatory System: Laryngeal Musculature Intrinsic Muscles Flashcards
Laryngeal Musculature
Regulate valve openings and closings including; Epiglottic valve,
Ventricular fold valve,
Vocal fold valve
Provide movement of laryngeal cartilages for speech
Intrinsic Muscles
Have both origin and insertion within larynx,
Make fine adjustments to the vocal mechanism
Intrinsic Muscles of Larynx
names and functions
*Adductors Lateral cricoarytenoid Transverse Arytenoid Oblique arytenoid *Abductor Poserior cricoarytenoid *Tensors cricothyroid Thyrovacalis (part of thyroarytenoid) *Relaxer thyromuscularis (part of thyroarytenoid)
(Intrinsic Muscles)
(Adductors - bring together):
Lateral cricoarytenoid
Adducts the vocal folds.
(Intrinsic Muscles)
(Adductors - bring together):
Transverse arytenoid
(only unpaired intrinsic muscle)
Adducts vocal folds
(Intrinsic Muscles)
(Adductors - bring together): Oblique arytenoid
adducts vocal folds (how tightly VF are pressed against each other), rocks arytenoid and vocal folds down and inward
(Intrinsic Muscles)
(Abductor - pull apart):
Posterior cricoarytenoid
Abducts vocal folds
(Intrinsic Muscles)
(Tensors - tighten muscles):
Cricothyroid
Primary tensor of the vocal folds,
Responsible for laryngeal adjustments associated with pitch change
(Intrinsic Muscles)
(Tensors - tighten muscles):
Cricothyroid, Pars Recta
Rotates thyroid cartilage downward
Intrinsic Muscles)
(Tensors - tighten muscles):
Cricothyroid, Pars Oblique
rotates thyroid cartilage downward, stretches vocal folds
(Intrinsic Muscles)
Tensors - tighten muscles): Thyrovocalis (part of thyroarytenoid
Body of vocal folds,
tenses vocal folds
(Intrinsic Muscles)
(Relaxer - relax muscles):
Thyromuscularis (part of thyroarytenoid)
Shorten and relax vocal folds
