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The risorius muscle is a thin, slender muscle that arises around the parotid fascia. It is continuous with the platysma muscle below and attaches to the corner of the mouth. The muscle extends almost horizontally across the cheek and pulls the corner of the mouth laterally. The buccal branch of the facial nerve innervates the muscle.

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Lower Facial Region

  • 章节

  • 发表日期：

    2025年

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  • Nobutaka Yoshioka,
  • Albert L. Rhoton, Jr.,
  • Juan C. Fernandez-Miranda

摘要

The risorius muscle is a thin, slender muscle that arises around the parotid fascia. It is continuous with the platysma muscle below and attaches to the corner of the mouth. The muscle extends almost horizontally across the cheek and pulls the corner of the mouth laterally. The buccal branch of the facial nerve innervates the muscle.