Risorius

The Musculus risorius ( from Lat = risorius serving laugh ) or Lachmuskel, which is also commonly referred to simply as short Risorius, belongs to the facial muscles and is part of the smile muscles. Some authors of the muscle is also regarded as a separate muscle bundles of the platysma, the great zygomatic muscle (musculus zygomaticus major) or the depressor anguli.

The muscle is designed to be very changeable and relatively weak in humans. It rises to the fascia of the masseter or chewing muscle ( masseter ) and to the skin of the cheek. The parotid ( parotid fascia ) can serve as the muscle origin. The approach is based on a muscle knot in the corner of the mouth. The Risorius is Innervated by the facial nerve (facial nerve ).

The muscle pulls the corners of the mouth upward and to the side. When contraction of the muscle or when laughing also arises in some people a small dimple on the cheek.

Swell

• Hermann Voss, Robert Mr. Linger: Handbook of Anatomy, Volume I: Introduction to the anatomy, the musculoskeletal system. Gustav Fischer Verlag, Stuttgart 1963, 12th edition, p.292.
• J. Fanghänel (ed.): Waldeyer human anatomy. de Gruyter 2003, 17th edition, p 229 ISBN 3-11-016561-9
• Hoffmann -La Roche AG, Urban & Schwarzenberg ( ed.): Roche Lexikon Medizin. 4th edition. Urban & Schwarzenberg, 1998. ISBN 3-541-17114-6.