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Human Anatomy: Muscle Groups

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Human Anatomy



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Muscle Function & Other Pertinent Medical Information
- INFERIOR CONSTRICTOR -
ORIGIN: Cricopharyngeus: lateral aspect of arch of cricoid cartilage. Thyropharyngeus: oblique line of laminar of thyroid cartilage and fibrous cricothyroid arch
INSERTION: Cricopharyngeus: continuous with muscle of opposite side, behind pharynx. Thyropharyngeus : lower pharyngeal raphe
ACTION: Assists swallowing . Cricopharyngeus acts as upper esophageal sphincter
NERVE: Pharyngeal plexus (IX, X and sympathetic) via pharyngeal branch of X with its motor fibers from cranial accessory (XI)













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