Risorius muscle

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Risorius muscle
Musculusrisorius.png
origin
Masseter fascia, skin of the cheek
approach
Corner of the mouth
function
Sideways u. Head movement of the corner of the mouth, drawing in of the cheek dimple
Innervation
Facial nerve ( cranial nerve VII)

The risorius (from Latin Risorius = serving laugh) or Lachmuskel that often simply abbreviated as Risorius is called, is part of the facial muscles and is part of the laugh muscles . Some authors also consider the muscle to be an independent muscle bundle of the platysma , the large zygomatic muscle ( Musculus zygomaticus major ) or the Musculus depressor anguli .

In humans, the muscle is very changeable and relatively weak. It arises on the masseteric fascia and on the skin of the cheek . The parotid compartment ( Fascia parotidea ) can also serve as the origin of the muscle. The attachment is on a muscle knot in the corner of the mouth . The Risorius is innervated by the facial nerve ( Nervus facialis ).

The laughing muscles pull the corner of the mouth, and with it the cheeks, up and to the side. When the muscle contracts or while laughing , some people also create a small dimple on their cheek.

literature

  • Hermann Voss, Robert Herrlinger: Taschenbuch der Anatomie . Volume I: Introduction to Anatomy, Musculoskeletal System . 12th edition. Gustav Fischer Verlag, Stuttgart 1963, p. 292.
  • J. Fanghänel (Ed.): Waldeyer Anatomie des Menschen . 17th edition. de Gruyter 2003, ISBN 3-11-016561-9 , p. 229.
  • Roche Lexicon Medicine . 4th edition. Urban & Schwarzenberg, 1998, ISBN 3-541-17114-6 .

Web links