World Library  
Flag as Inappropriate
Email this Article

Extensor digitorum longus muscle

Article Id: WHEBN0003042915
Reproduction Date:

Title: Extensor digitorum longus muscle  
Author: World Heritage Encyclopedia
Language: English
Subject: Flexor digitorum brevis muscle, Anterior compartment of leg, Flexor digitorum longus muscle, Extensor digitorum brevis muscle, Dorsal interossei of the foot
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Extensor digitorum longus muscle

Extensor digitorum longus muscle
The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.)
Details
Latin musculus extensor digitorum longus
Origin Anterior lateral condyle of tibia, anterior shaft of fibula and superior 34 of interosseous membrane
Insertion Dorsal surface; middle and distal phalanges of lateral four digits
anterior tibial artery
deep fibular nerve
Actions extension of toes and dorsiflexion of ankle
Antagonist Flexor digitorum longus, Flexor digitorum brevis
Dorlands
/Elsevier
m_22/12548912
Anatomical terms of muscle

The extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg.

Contents

  • Origin and insertion 1
  • Variations 2
  • See also 3
  • Additional Images 4
  • References 5
  • External links 6

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 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.

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.

See also

Additional Images

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

  • -590348211 at GPnotebook
  • Anatomy photo:15:st-0401 at the SUNY Downstate Medical Center
  • PTCentral
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.