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Other Terms: Musculus risorius, Muscle risorius
Latin muscle parts
Branchial arch muscle – second arch (Facial muscle)
The English name for this muscle is the laughing muscle. The word risorius comes from the Latin risus meaning “laugh.”
Somewhat variable, it can attach to the zygomatic arch, the parotid and masseteric fascia, and blend with fibers of the platysma
Blends with other muscle fibers in the modiolus at the angle of the mouth
Pulls the angle of the mouth laterally and somewhat superiorly.
Facial nerve (Cranial nerve VII)
Small anastomotic branches from the first part of the facial artery; transverse facial artery.