Depressor labii inferioris muscle 2283697 188222213 2008-01-31T20:26:18Z Banano03 5980645 {{Muscle infobox | Name = Depressor labii | Latin = musculus depressor labii inferioris | GraySubject = 108 | GrayPage = 383 | Image = Depressor labii inferioris.png | Caption = Muscles of the head, face, and neck. | Origin = oblique line of the [[mandible]], between the [[symphysis]] and the [[mental foramen]] | Insertion = integument of the [[lower lip]], [[Orbicularis oris muscle|Orbicularis oris]] fibers, its fellow of the opposite side | Blood = | Nerve = [[facial nerve]] | Action = [[Depression (kinesiology)|depress]] the [[lower lip]] | DorlandsPre = m_22 | DorlandsSuf = 12548762 | }} The '''depressor labii inferioris''' (or '''quadratus labii inferioris''') is a [[facial muscle]] that helps lower the [[bottom lip]]. ==Structure== This muscle arises from the oblique line of the mandible, and inserts on the skin of the lower lip, blending in with the [[orbicularis oris]] muscle. At its origin, depressor labii is continuous with the fibers of the [[platysma muscle]]. Much yellow fat is intermingled with the fibers of this muscle. ==Innervation== The depressor labii inferioris is innervated by the [[facial nerve]]. ==Actions== This muscle helps to depress the lower lip. ==See also== * [[Facial muscles]] * [[Depressor anguli oris]] ==Additional images== <gallery> Image:Gray176.png|Mandible. Outer surface. Side view. </gallery> ==External links== * {{MuscleLoyola|dli}} * {{GPnotebook|-677773235}} * {{eMedicineDictionary|Depressor+labii+inferioris+muscle}} {{Gray's}} {{muscle-stub}} {{Muscles_of_head}} [[Category:Muscles of the head and neck]] [[ar:عضلة خافضة للشفة السفلية]] [[de:Musculus depressor labii inferioris]] [[hu:Alsó ajkat lefelé húzó izom]] [[ja:下唇下制筋]] [[sr:Мишић обарач доње усне]] [[sh:Mišić obarač donje usne]] [[fi:Alahuulen alasvetäjälihas]]