Unit 4 - the pharynx

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Author:
jadnebalasca
ID:
184449
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Unit 4 - the pharynx
Updated:
2012-11-19 14:02:36
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Jad Nebalasca
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Description:
A&P of the ear and speech mech
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  1. Pharyngeal aponeurosis
    • Back wall of throat
    • Extends from base of skull to behind the cricoid cartilage of the larynx
  2.  Pharyngeal constrictors
    • Sets of muscles that blend into pharyngeal aponeurosis which constrict or narrow the pharynx
    • Origin: lateral areas of the pharynx
    • Insertion: medial raphe
  3. Inferior constrictor
    • thickest and strongest
    • arises from area of cricoid and thyroid cartilages
    • overlaps with the middle constrictor
  4. Middle constrictor
    originates from area of hyoid and overlaps with superior constrictor
  5. Superior constrictor
    • weakest of three
    • arises from area of pterygoid plates
    • superior most fibers forms a subgroup called prerygophyaryngeus
  6. Salpingopharyngeus
    • Origin: bottom of the Eustachian tube, belnding into the palatopharyngeus
    • Action: life the pharyngeal wall
  7. Actions to achieve velopharyngeal closiure
    • Occurs when speaking and swallowing
    • Velum moves up and back (levator veli palatini)
    • Posterior pharyngeal wall moves forward to meet the velum (superior contrictor with the pterygopharyneus = Passavant's Pad)
    • Laterak walls move medially to create a fairly complete seal (superior contrictor)

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