Risorius: Origin, insertion, innervation, function | Kenhub 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
Risorius - Wikipedia The risorius muscle is a highly variable muscle of facial expression It has numerous and very variable origins, and inserts into the angle of the mouth It receives motor innervation from branches of facial nerve (CN VII) It may be absent or asymmetrical in some people It pulls the angle of the mouth sidewise, such as during smiling
Anatomy, Head and Neck, Risorius Muscle - StatPearls - NCBI Bookshelf The risorius muscle is a narrow bundle of muscle fibers that becomes narrower from its origin at the fascia of the lateral cheek over the parotid gland and superficial masseter and platysma muscles, to its insertion onto the skin of the angle of the mouth
Risorius - Structure, Location, Anatomy, Function, Diagram The risorius is a thin, elongated muscle that is located in the skin of the face It is composed of long, slender fibers that are oriented horizontally and run parallel to the skin surface The muscle is attached to the skin at one end, and to the corner of the mouth at the other end
Risorius Muscle | Complete Anatomy - Elsevier Learn about the risorius muscle, its origin, insertion, action, innervation, and arterial supply Understand its role in facial expressions
RISORIUS Definition Meaning | Merriam-Webster Medical The meaning of RISORIUS is a narrow band of muscle fibers arising from the fascia over the masseter muscle, inserted into the tissues at the corner of the mouth, and acting to retract the angle of the mouth
Risorius - anatomic. us Risorius is a large muscle among facial muscles It is included in muscles of facial expressions It is located around the mouth Risorius is broad at its origin and thinner at insertion However size and form can vary among individuals Origin: Risorius arises from zygomatic arch , parotid fascia and masseteric fascia
Risorius muscle - e-Anatomy - IMAIOS Description: The Risorius arises in the fascia over the Masseter and, passing horizontally forward, superficial to the Platysma, is inserted into the skin at the angle of the mouth It is a narrow bundle of fibers, broadest at its origin, but varies much in its size and form
Risorius | Anatomy. app The risorius is a very slender and relatively narrow facial muscle located lateral to the mouth, overlying the buccinator It is a superficial muscle and a component of the superficial musculoaponeurotic system (SMAS) Because of its lateral position, the risorius pulls the angle of the mouth outward, enabling smiling