risorius

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risorius

(rɪˈzɔːrɪəs)
n
a facial muscle responsible for smiling
References in periodicals archive ?
Just under the ear, she places an inverted triangle in white clay, the parotid, a salivary gland and, stretching from the parotid gland to the corner of the mouth, the thin risorius muscle (Fig 8), often called the Tip stretcher', widening the mouth and creating a sardonic expression.
Denervation of the orbicularis oculi muscle results in the inability of the patient to close the eye lids effectively, while denervation of the risorius muscle results in the limited retraction of the angle of mouth.
the marginal mandibular branch to the risorius muscle and the muscles of the lower lip and chin