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Function of Risorius muscle
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@drimransofficial The risorius muscle's function is to aid in facial expression by pulling the corner of the mouth laterally via its contraction in an outward and upward motion. In conjunction with other facial muscles, this helps to create a smile or a frown, and myriad other expressions in-between. • Risorius muscle • Author: Gordana Sendić MD • Reviewer: Francesca Salvador MSc • Last reviewed: February 28, 2022 • Reading time: 4 minutes • Risorius is a slender and narrow facial muscle that belongs to the buccolabial group of muscles. It is highly variable and inconsistent where it is believed to be unique to the African apes and humans. If present, it is found in the superficial layer of the facial muscles on either side of the lips, overlying the buccinator muscle. • It is deemed as the ‘smiling muscle’ as its bilateral contraction pulls the angles of the mouth laterally and slightly superiorly and produces a smile. • This article will teach you all you need to know about the anatomy and functions of the risorius muscle. • Key facts about the risorius • Table quiz • Origin Parotid fascia, Buccal skin, zygomatic bone (variable) • Insertion Modiolus • Function Extends angle of mouth laterally • Innervation Buccal branch of facial nerve (CN VII) • Blood supply Superior labial artery (facial artery)
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