335 11.1 Intrinsic Muscles of the Larynx

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shanamd2011
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335 11.1 Intrinsic Muscles of the Larynx
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2012-04-02 18:38:21
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intrinsic muscles of the larynx
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  1. intrinsic muscles of the larynx have
    both origin and insertion withint he larynx
  2. landmarks of the larynx 10
    • epiglottis
    • aryepiglottic folds
    • laryngeal aditus
    • laryngeal vestibule
    • vertricular folds / false vocal folds
    • laryngeal ventricle
    • true vocal folds
    • conus elasticus
    • glottis
    • pyriform sinuses
  3. aryepiglottic folds
    membrane extending from arytenoid cartilages to epiglottis
  4. laryngeal aditus
    entryway into larynx
  5. laryngeal vestibule
    opening of larynx epiglottis and aditus but above the false vocal folds
  6. ventricular folds / false vocal folds
    located between the laryngeal vestibule and the laryngeal ventricle
  7. laryngeal ventricle
    lateral outpouching between true and false vocal folds
  8. true vocal folds
    • = thyroarytenoid muscles
    • = vocal ligaments = upward extension of the conus elasticus
  9. conus elasticus
    also known as the cricothyroid membrane
  10. glottis
    space between true vocal folds
  11. pyriform sinuses
    shallow depressions lateral to aryepiglottic folds at level of vocal folds
  12. structure of the vocal folds
    5 layers
    • 1. squamous epithelium - most superficial
    • 2. lamina propria
    • - superficial layer
    • - intermediate layer
    • - deep layer
    • 3. thyrovocalis muscle
  13. squamous epithelium
    • most superficial extremely thin layer
    • glistening white portion
    • aids in hdration by retention of fluid
  14. lamina propria
    • comprised of 3 layers
    • connective tissue
    • superificial, intermediate, and deep layers
  15. suprficial layer of lamina propria
    • very elastic
    • made of elastin fibers
    • AKA Reinke's space
    • very susceptible to swelling
  16. intermediate layer of lamina propria
    elastic fibers
  17. deep layer of lamina propria
    collagen fibers
  18. thyrovocalis muscle
    • deep to lamina propria
    • bulk of the vocal folds
  19. layers of the vocal folds 4
    • mucosal epithelium (outer surface covering)
    • superficial lamina propia (Reinke's space, covering)
    • Intermediate and deep lamina propria (ligament)
    • vocalis muscle (deep contractile tissue, body)
  20. thyroarytenoid
    thyrovocalis (vocalis)
    • o - angle of the thyroid
    • dorsal (inner) surface
    • c - back
    • ins - vocal process of the arytenoid
    • f - independently relaxes vocal folds
    • co-operatively tenses vocal folds
    • inn - X vagus recurrent laryngeal branch
  21. thyroarytenoid
    thyromuscularis
    • o - angle of the thyroid
    • dorsal (inner) surface
    • c - back
    • ins - base and muscular process of the aytenoid
    • f - relaxes the vocal folds
    • inn - X vagus recurrent laryngeal branch
  22. posterior cricoaytenoid
    • only glottal
    • lateral and medial bunches
    • o - posterior lamina of the cricoid
    • c - obliquely up
    • ins - muscular process of the arytwnoid
    • function - abducts vocal folds and pulls back arytenoid
    • inn - recurrent laryngeal branch of the X Vagus nerve
  23. lateral cricoarytenoid
    • o - upper and lateral borders of cricoid arch
    • c - up and back
    • ins - muscular process of the arytenoid
    • f - adducts the vocal folds and pulls forward on the arytenoid
    • inn - recurrent laryngeal brach of X Vagus
  24. interarytenoids (arytenoids)
    transverse arytenoid
    • o - lateral - posterior surface of one arytenoid
    • ins - lateral - posterior surface of the other arytenoid
    • f - adducts the vocal folds and pulls the arytenoids together
  25. interarytenoids
    oblique arytenoid
    • o - posterior base of muscular process of one arytenoid
    • c - obliquely up
    • ins - apex of other arytenoid
    • f - adducts the vocal folds and pulls the arytenoids together
    • inn - recureent pharyngeal branch of X Vagus
  26. cricothyroid
    • two section : pars recta (vertical) and pars oblique (dorsal)
    • o - pars recta - anterior surface of the cricoid beneath arch
    • pars oblique - lateral to pars recta
    • c - pr - up and out
    • po - obliquely up
    • ins - pr - lower lamina of the thyroid
    • po - between laminae and inferior horns of thyroid
    • f - pulls thyroid forward and down
    • lengthens the vocal folds
    • increases vocal tensoin
    • changes pitch
    • inn - superior laryngeal branch of the X Vagus

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