Risorius muscle
Risorius muscle |
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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
- Entry on Musculus risorius in Flexikon , a wiki from DocCheck (animated muscle with skin that can be faded in and out)