| 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
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| INSERTION
Cricopharyngeus: continuous with muscle of opposite side, behind pharynx. Thyropharyngeus : lower pharyngeal raphe
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| ACTION
Assists swallowing . Cricopharyngeus acts as upper esophageal sphincter
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| NERVE
Pharyngeal plexus (IX, X and sympathetic) via pharyngeal branch of X with its motor fibers from cranial accessory (XI)
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