出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/07/20 08:02:40」(JST)
| Extensor digitorum longus muscle | |
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The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.)
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| Details | |
| Origin | Anterior lateral condyle of tibia, anterior shaft of fibula and superior 3⁄4 of interosseous membrane |
| Insertion | Dorsal surface; middle and distal phalanges of lateral four digits |
| Artery | anterior tibial artery |
| Nerve | deep fibular nerve |
| Actions | extension of toes and dorsiflexion of ankle |
| Antagonist | Flexor digitorum longus, Flexor digitorum brevis |
| Identifiers | |
| Latin | musculus extensor digitorum longus |
| Dorlands /Elsevier |
m_22/12548912 |
| TA | A04.7.02.038 |
| FMA | 22534 |
| Anatomical terms of muscle
[edit on Wikidata]
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The extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg.
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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 fibularis muscles on the lateral side. Between it and the tibialis anterior are the upper portions of the anterior tibial vessels and deep peroneal nerve.
The muscle passes under the superior and inferior extensor retinaculum of foot in company with the fibularis 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 articulations, 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 lumbricals, 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.
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.
Dorsum of Foot. Deep dissection.
Dorsum of Foot. Deep dissection.
Ankle joint. Deep dissection. Lateral view.
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
Muscles of the hip and human leg
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| リンク元 | 「深腓骨神経」「長趾伸筋」 |
| 拡張検索 | 「extensor digitorum longus muscle」「musculus extensor digitorum longus」 |
| 関連記事 | 「long」「digitorum」「longus」 |
坐骨神経→'総腓骨神経'+脛骨神経 '総腓骨神経'→浅腓骨神経＋深腓骨神経
| 肉単P | 筋名 | 起始 | 停止 | 支配神経 | 機能 |
| V-1 | 前脛骨筋 | 脛骨(外側面)、骨間膜 | 内側楔状骨、第1中足骨(基底部) | 深腓骨神経 | 足関節の背屈・内反、足底のアーチ維持 |
| V-4 | 第三腓骨筋 | 腓骨（下部の前面) | 第5中足骨(基底部) | 深腓骨神経 | 足関節の外反・背屈 |
| V-5 | 長趾伸筋 | 脛骨(外側顆)、腓骨(前縁上方) | 第2-5指(基、中、末節骨底の背面) | 深腓骨神経 | 第2-5趾の伸展 |
| V-6 | 長母趾伸筋 | 腓骨（及び骨間膜の前面) | 母趾(末節骨底の背面) | 深腓骨神経 | 母趾の伸展(IP関節) |