risorius muscle

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[1]

Origin

platysma & fascia of masseter

Insertion

orbicularis oris & skin at corner of mouth

Action

  • draws angle of mouth laterally, lengthening the rim of the mouth

Innervation

facial nerve (CN VII)

More general terms

References

  1. ↑ Stedman's Medical Dictionary 26th ed, Williams & Wilkins, Baltimore, 1995
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