Extensor digitorum longus muscle 3042915 223996392 2008-07-06T21:39:47Z Vedran12 7322109 interwiki hr {{Infobox Muscle | Name = {{PAGENAME}} | Latin = musculus extensor digitorum longus | GraySubject = 129 | GrayPage = 481 | Image = Gray1241.png | Caption = The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.) | Image2 = | Caption2 = | Origin = Lateral Condyle of tibia and superior ¾ of [[interosseous membrane]] | Insertion = Middle and Distal [[phalanges]] of lateral four digits | Blood = [[anterior tibial artery]] | Nerve = [[peroneal nerve]] | Action = [[Extension (kinesiology)|extension]] of [[toes]] and [[ankle]] | Antagonist = [[Flexor digitorum longus muscle|Flexor digitorum longus]], [[Flexor digitorum brevis muscle|Flexor digitorum brevis]] | MeshName = | MeshNumber = | DorlandsPre = m_22 | DorlandsSuf = 12548912 | }} The '''Extensor digitorum longus''' is a [[pennate]] muscle, situated at the lateral part of the front of the leg. ==Origin and insertion== It arises from the [[lateral condyle]] of the [[tibia]]; from the upper three-fourths of the anterior surface of the body of the [[fibula]]; from the upper part of the [[interosseous membrane]]; from the deep surface of the fascia; and from the intermuscular septa between it and the [[Tibialis anterior]] on the medial, and the [[Peronæi]] on the lateral side. Between it and the Tibialis anterior are the upper portions of the anterior tibial vessels and deep peroneal nerve. The tendon passes under the transverse and [[cruciate crural ligament]]s in company with the [[Peronæus tertius]], and divides into four slips, which run forward on the dorsum of the foot, and are inserted into the second and third phalanges of the four lesser toes. The tendons to the second, third, and fourth toes are each joined, opposite the [[metatarsophalangeal]] articulation, on the lateral side by a tendon of the [[Extensor digitorum brevis]]. The tendons are inserted in the following manner: each receives a fibrous expansion from the [[Interossei]] and [[Lumbricalis]], and then spreads out into a broad aponeurosis, which covers the dorsal surface of the first phalanx: this [[aponeurosis]], at the articulation of the first with the second phalanx, divides into three slips—an intermediate, which is inserted into the base of the second phalanx; and two collateral slips, which, after uniting on the dorsal surface of the second phalanx, are continued onward, to be inserted into the base of the third phalanx. ==Variations== This muscle varies considerably in the modes of origin and the arrangement of its various tendons. The tendons to the second and fifth toes may be found doubled, or extra slips are given off from one or more tendons to their corresponding metatarsal bones, or to the short extensor, or to one of the interosseous muscles. A slip to the great toe from the innermost tendon has been found. ==Additional images== <gallery> Image:Gray268.png|Bones of the right foot. Dorsal surface. Image:Extensor digitorum longus.png|Muscles of the front of the leg. Image:Gray440_color.png|Cross-section through middle of leg. Image:Gray835.png|Deep nerves of the front of the leg. </gallery> ==See also== * [[Extensor digitorum brevis muscle]] * [[Extensor digitorum muscle]] ==External links== * {{MuscleLoyola|exdl}} * {{GPnotebook|-590348211}} * {{SUNYAnatomyLabs|15|st|04|01}} * {{eMedicineDictionary|Extensor+digitorum+longus}} * [http://www.ptcentral.com/muscles/musclelegs.html#extensor%20digitorum%20longus PTCentral] {{Gray's}} {{Muscles_of_lower_limb}} [[Category:Calf muscles]] [[de:Musculus extensor digitorum longus]] [[hr:Dugački ispružač prstiju]] [[ja:長趾伸筋]]