Flexor digitorum longus muscle
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| Flexor digitorum longus muscle | ||
|---|---|---|
 | ||
| Tendons of the foot, medial view. | ||
| Gray's | subject #129 485 | |
| Origin: | ||
| Insertion: | ||
| Artery: | posterior tibial artery | |
| Nerve: | Tibial nerve | |
| Action: | Primary action is Flex digits | |
| Antagonist: | Extensor digitorum longus, Extensor digitorum brevis | |
| Dorlands/Elsevier | m_22/12549081 | |
The Flexor digitorum longus is situated on the tibial side of the leg. At its origin it is thin and pointed, but it gradually increases in size as it descends.
Origin and insertion
It arises from the posterior surface of the body of the tibia, from immediately below the popliteal line to within 7 or 8 cm. of its lower extremity, medial to the tibial origin of the Tibialis posterior; it also arises from the fascia covering the Tibialis posterior.
The fibers end in a tendon, which runs nearly the whole length of the posterior surface of the muscle. This tendon passes behind the medial malleolus, in a groove, common to it and the Tibialis posterior, but separated from the latter by a fibrous septum, each tendon being contained in a special compartment lined by a separate mucous sheath.
It passes obliquely forward and lateralward, superficial to the deltoid ligament of the ankle-joint, into the sole of the foot, where it crosses below the tendon of the Flexor hallucis longus, and receives from it a strong tendinous slip.
It then expands and is joined by the Quadratus plantæ, and finally divides into four tendons, which are inserted into the bases of the last phalanges of the second, third, fourth, and fifth toes, each tendon passing through an opening in the corresponding tendon of the Flexor digitorum brevis opposite the base of the first phalanx.
Variations
Flexor accessorius longus digitorum, not infrequent, origin from fibula, or tibia, or the deep fascia and ending in a tendon which, after passing beneath the laciniate ligament, joins the tendon of the long flexor or the Quadratus plantæ.
Additional images
 Bones of the right leg. Posterior surface. |
 Bones of the right foot. Plantar surface. |
 Coronal section through right talocrural and talocalcaneal joints. |
 Muscles of the back of the leg. Deep layer. |
 Cross-section through middle of leg. |
 Muscles of the sole of the foot. Second layer. |
 Circumpatellar anastomosis. |
 Nerves of the right lower extremity Posterior view. |
 The plantar nerves. |
External links
- LUC fdl
- -301596593 at GPnotebook
- SUNY Labs 15:st-0403
- Flexor+digitorum+longus at eMedicine Dictionary
- PTCentral
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
