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 Aids 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) |