335 10.1 Framework of the Larynx Part 1

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Author:
shanamd2010
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144038
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335 10.1 Framework of the Larynx Part 1
Updated:
2012-03-28 18:17:37
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framework larynx
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framework of the larynx
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  1. Phonation purposes
    • production of voice is a secondary purpose
    • primary purpose is to keep foreign material out of trachea
  2. what is the larynx
    • a protective 'valve'
    • a vertical tube sitting in a larger tube (phayrnx)
  3. the hyoid bone 4
    • support structure of larynx
    • does not articulate with other bones
    • anchors the larynx from above
    • anchors the tongue from below
  4. hyoid bone landmarks 5
    • greater horns (cornua)
    • lesser horns
    • corpus (body)
    • anterior surface is convex
    • posterior surface is concave
  5. cartilages of the larynx 6
    • epiglottis 1
    • thyroid 1
    • cricoid 1
    • arytenoids 2
    • corniculates 2
    • cuneiforms 2
  6. epiglottis characteristics
    • leaf like
    • folds over laryngeal aditus during swallowing
  7. epiglottis articulates with
    thyroid cartilage - via thyroepiglottic ligament and hyoid bone - via hyoepiglottic ligament
  8. epiglottis sides joined with
    arytenoid cartilages via aryepiglottic folds
  9. epiglottis landmarks
    • petiolus - stem
    • valleculae - depression just behind root of tongue
  10. thyroid 3
    • largest cartilage of the larynx
    • horseshoe shaped
    • rests on the cricoid
  11. thyroid landmarks
    • superior cornua/horns - superior projections
    • articulates with hyoid bone
    • inferior cornua/horns - inferior projections
    • articulates with the cricoid cartilage
    • laminae - the plates/surface/body of thyroid
    • oblique line - found on lamina - where muscles attach
    • angle of the thyroid - where the 2 lamina join
    • thyroid notch - prominenece known as the Adam's apple that you can palpate (feel)
    • triticial cartilage - found between the superior horn of thyroid and hyoid bone; not everyone has this
  12. cricoid 3
    • signet-ring shaped
    • inferior to thyroid and arytenoids
    • sits atop of the first tracheal ring
  13. cricoid landmarks 2
    • anterior arch - thinner portion on the front
    • posterior lamina - where the arytenoid cartilage sit
  14. arytenoids 4
    • three-sided pyramid shaped
    • rest on the posterior portion of cricoid
    • most moveable of all cartilages
    • rotate medially and inferiorly
  15. arytenoids landmarks
    • apex - superior portion where corniculate cartilages site
    • muscular process - lateral projection where muscles attach
    • vocal process - medial projection where vocal folds attach
  16. corniculates 4
    • sit atop of the arytenoids
    • do not articulate independently
    • no muscular attachments or articulations
    • adds height to the arytenoids
  17. cuneiforms
    • no muscular attachments or articulations
    • strengthen the aryepiglottic folds ( as they are found within this structure)
  18. extrinsin muscles of the larynx
    def
    only one attachment in the larynx or no attachment
  19. sternothyroid
    • o - manubrium of the sternum
    • c - upwards
    • ins - oblique line of the thyroid cartilage
    • f - depresses thyroid and larynx
    • inn - XII Hypoglossal and C1 C2
  20. Thyrohyoid
    • o - oblique line of thyroid cartilage
    • c - upward
    • ins - greater horn of the hyoid bone
    • f - elevates thyroid and larynx and depresses hyoid
    • inn - XII Hypoglossal and fibers from C1
  21. Sternohyoid
    • o - manubrium of the sternum and medial end of the clavicle
    • c - upwards
    • ins - inferior body of the hyoid
    • f - depresses the hyoid
    • inn - ansa cervicalis
  22. ansa cervicalis
    • loop of the first three spinal nerves
    • C1 through C3
  23. omohyoid
    • two bellied muscle (L shaped)
    • ataches to the hyoid via intermediate tendon
  24. omohyoid superior belly
    • o - corpus of hyoid
    • c - down
    • ins - at the intermediate tendon the the hyoid bone
    • f - prevents neck collapse and depresses hyoid
    • inn - ansa cervicalis C2 - C3
  25. omohyoid inferior belly
    • o - upper border of scapula
    • c - up and medially
    • ins - at the intermediate tenon to hyoid bone
    • f - prevents neck collapse and depresses hyoid
    • inn - nasa cervicalis C2 - C3
  26. inferior pharyngeal constrictor
    • o - cricoid and thyroid cartilages
    • ins - midline raphe of pharynx
    • f - stabilizes larynx

    • UPPER ESOPHAGEAL SPHINCTER
    • cricopharyngeus muscle
  27. digastric anterior belly
    • o - symphysis of the mandible
    • c - back
    • ins - intermediate tendon of the hyoid bone
    • eventually the hyoid bone / greater horn junction
    • f - pulls hyoid up and forward
    • inn - V Trigeminal nerve, mandibular branch
  28. Digastric posterior belly
    • o - mastoid process of temporal bone
    • c - down
    • ins - intermediate tendon of the hyoid bone
    • eventually the hyoid body / greater horn junction
    • f - pulls hyoid up and back
    • inn - VII facial nerve
  29. stylohyoid
    • o - styloid process of the temporal bone
    • c - medial and down
    • ins - hyoid bone near intermediate tendon on greater horn
    • f - pulls hyoid up and back
    • inn - VII facial nerve
  30. mylohyoid
    • forms the floor of the mouth
    • o - mylohyoid line of the mandible
    • c - fans downward
    • ins - median raphe of the floor of the mouth
    • hyoid body
    • f - elevates hyoid and tongue and depresses the mandible
    • inn - V mandibular branch of trigeminal
  31. geniohyoid
    • superior to the mylohyoid
    • o - median ridge of the mandible (symphysis)
    • c - back and down
    • ins - body of the hyoid bone
    • f - elevates hyoid and tongue and depresses mandible
    • inn - XII hypoglossal
  32. hyoglossus
    • o - greater horn of the hyoid bone
    • c - upward
    • ins - posterior and lateral tongue
    • f - raises hyoid and pulls down and back on tongue
    • inn - XII hypoglossal
  33. genioglossus
    • o - mental spine of the mandible (symphysis)
    • c - up, back, and down
    • ins - tongue-superior fibers, pharynx-medial figers, hyoid body-inferior fibers
    • f - elevates the hoid and protrudes the tongue
    • inn - XII hypoglossal nerve

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