It divides into four slips that insert into the proximal and distal phalanges of the lateral four digits of the foot. It divides distally into four tendons that pass under the extensor retinaculum and diverge on the back of the hand, inserting into the second and third phalanges of the medial four fingers. Apr 27, 2020 the extensor digitorum longus is a muscle of the anterior compartment of the lower leg. Digitorum meaning in the cambridge english dictionary. Extensor digitorum longus muscle the mucous sheaths of the tendons around the ankle. The anterior group of the lower leg muscles is comprised of the tibialis anterior. Insertion external expansion to middle and distal phalanges by four tendons. Extensor digitorum longus muscle attachments, actions. Splits into 4 tendon slips after inferior extensor retinaculum, each of which insert on dorsum of middle and distal phalanges as part of extensor expansion complex. Extensor digitorum longus is a long muscle of the lower limb that acts primarily as foot dorsiflexor. The extensor digitorum originates from the lateral epicondyle of the humerus. The extensor carpi radialis longus inserts ends at the bottom of the second metacarpal, which means that this muscle inserts onto the bottom of the index finger bone that is located in the hand.
Origin upper two thirds of anterior shaft of fibula, interosseous membrane and superior tibiofibular joint. The extensor digitorum longus inserts onto the middle and distal phalanges of toes two through five. The extensor digitorum longus also extensor digitorum longus muscle, latin. It is essentially the medial part of the extensor digitorum brevis muscle. The edb is a trapezoidshaped muscle on the dorsum of the foot, lateral to the extensor hallucis longus tendon and deep to the tendons of the long toe extensors. Threedimensional ct volume rendering image of closed subcutaneous rupture of the extensor digitorum longus tendon in the present patient.
It functions to extend the phalanges and, by continued action, the wrist. This muscle varies considerably in the modes of origin and the arrangement of its various tendons. Digital dissection and threedimensional interactive models. Extensor digitorum how is extensor digitorum abbreviated. Extensor digitorum longus medical definition merriam. The part of its origin at tibial condyle is fused with the originating fibers of the fibularis longus muscle. Yajuan wang omd, lac, in microacupuncture in practice, 2009. Posterior interosseous nerve c7 and c8, the continuation of the deep branch of the radial nerve. At its origin, it is tiny and pointed, although it progressively expands in size as it descends. Smaller foot and ankle muscles play an important role in foot and ankle stability, especially the flexor hallucis brevis, flexor hallucis longus, extensor hallucis brevis, extensor hallucis longus, plantaris, interossei, flexor digitorum. 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. Splits into 4 tendon slips after inferior extensor retinaculum, each of which insert on dorsum of middle and distal phalanges as part of.
Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints innervation. Extensor digitorum is innervated by the posterior interosseous nerve, which is. The utility of the knotless suture fixation for bilateral second toe transplantation in traumatic multipledigit amputation. The extensor digitorum muscle is the main extensor of the fingers.
It consists of 4 bellies that originate from ligamentous structures of the tarsal sinus and inserts on each of the long extensor tendons of the 4 medial toes. Oxygenated blood arrives at the muscle via the anterior tibial artery, and blood is drained by one of the dorsal digital veins. The muscular innervations come by way of the deep fibular nerve. The tendon continues into the distal part of the forearm. Extensor digitorum longus definition of extensor digitorum. The ehl is a thin muscle, situated between the tibialis anterior and the extensor digitorum longus 1. It arises in the extensor fossa on the lateral epicondyle of the femur and passes through the sulcus extensorius of the tibia. Like the majority of the muscles in this compartment, it originates via common extensor tendon that arises from the lateral epicondyle of humerus. Pdf optimal needle placement for extensor hallucis longus. The extensor digitorum brevis also extensor digitorum brevis muscle, latin.
Damage to the extensor hallucis longus muscle may limit the big toes mobility. Extends medial four digits at metacarpophalangeal joints. Extensor digitorum longus originates from the inferior part of the lateral tibial condyle, the proximal half of the medial surface of fibula and the anterior surface of the interosseus membrane its most superior part. It splits into four, and inserts into the extensor hood. The fdl arises from the medioposterior surface of the tibia and descends inferiorly through the leg towards the ankle joint.
A 32yearold male ultramarathon runner developed chronic tenosynovitis of the ankle. In some people, the muscle joins at its base of origination with the extensor digitorum longus. Medial and posterior surface of the tibia, distal to the popliteal line. Stenosing tenosynovitis of the extensor digitorum longus tendon is an injury related to ultramarathon running.
Extensor digitorum brevis extends the first four digits at the metatarsophalangeal joint and assists in extending the second, third and fourth digits at the interphalangeal joint. It is one of the five deep extensors in the forearm, along with the supinator, extensor pollicis brevis, extensor pollicis longus and extensor indicis apart from supinator, all the deep extensor muscles span from the forearm to the hand, crossing the wrist joints and thus being able to act upon them. The extensor digitorum or extensor digitorum muscle, latin. The extensor hallucis brevis ehb is a muscle on the top of the foot that helps to extend the big toe. Pdf snapping of the extensor digitorum longus due to. A few centimeters above the ankle joint, the muscle gives off a tendon that runs posterior to the medial. Pain on the anterior of the lower leg is often to be solely the result of shin splints. The muscle is located between the tibialis anterior and the extensor digitorum longus muscles. The extensor digitorum longus originates from the lateral condyle of the tibia and from the anterior surface of the head of the. Extensor digitorum longus muscle an overview sciencedirect. Extensor digitorum digitalis longus muscle musculus extensor digitorum digitalis. The extensor digitorum longus is an important muscle that performs several movements of the ankle and toes. Posterior interosseous nerve c7 and c8, the continuation of the deep branch of the radial nerve arterial supply.
On the dorsum of the foot at the midpoint of the transverse crease of the ankle joint in the depression between the tendons of the muscles extensor digitorum longus and hallucis longus. Flexes all joints of the hallux, plantar flexion of the ankle joint antagonist. It arises from the inferior twothirds of the posterior surface of the body of the fibula, with the exception of 2. Tendons 3 and 4 usually fuse and little finger just receives a slip. The extensor digitorum brevis originates from the superior and lateral surface of the calcaneus insertion. The tendon may be divided into three slips confined to the great toe. Extensor digitorum longus edl is a thin muscle situated in the anterior leg lateral to extensor hallucis longus and extends the lateral four toes. The fifth digit, lacking any insertion from extensor digitorum brevis, can only be raised by the long extensor. The extensor digitorum longus muscle is situated in the front part of the leg and neighbors the peroneus brevis muscle and tibialis anterior muscle. This fascia is continuous with the thinner fascia over the dorsum of the foot and toes.
It has only a slightly smaller moment arm for dorsiflexion at the ankle than the anterior. The flexor hallucis longus is situated on the fibular side of the leg. The extensor digitorum longus plays an important role in walking, running, jumping, and foot dorsiflexion. Extensor carpi radialis longus primarily acts on the wrist joint to produce two major actions. Headache, dizziness, pain from abdominal distension, constipation, weakness of the lower extremities, pain of. The flexor digitorum longus muscle is positioned on the tibial side of the leg. The extensor digitorum descends vertically and reaches the dorsal surface of. Lateral condyle of tibia, upper 23 34 of medial fibular shaft surface, upper part of interosseous membrane, fascia cruris, and anterior intermuscular septum insertion. Extensor digitorum is innervated by the posterior interosseous nerve, which is a branch of the radial nerve. This tendon serves as a proximal attachment for extensor digiti minimi, extensor carpi radialis brevis and extensor carpi ulnaris muscles.
The extensor hallucis longus originates from the anterior surface of the fibula and from the interosseous membrane of the leg. Aug 08, 2018 extensor digitorum longus emerges generally via the upper half of the medial side of the fibula lateral to and also above the origin of the extensor hallucis longus muscle, as well as prolongs superiorly over the lateral condyle of the tibia. Apr 14, 2015 the extensor digitorum longus muscle is located at the front of the leg and is adjacent to the peroneus brevis muscle and the tibialis anterior muscle. The function of the extensor digitorum longus muscle is to facilitate extension of the foot at the ankle as well as the toes. The flexor digitorum brevis muscle arises from the proximal portion of the.
Closed rupture of the extensor digitorum longus tendon. Learn more about its anatomy and function at kenhub. White arrows indicate the rupture site of the extensor digitorum longus tendon. Extensor digitorum is a superficial muscle of the posterior compartment of the forearm. The flexor and extensor tendons of both fingers were approximated to the corresponding flexor digitorum longus and extensor digitorum longus with interlacing suture. The upper thirds of the muscle extends over to the fibula and traverses. Extensor hallucis longus radiology reference article. The extensor digitorum longus muscle is located at the front of the leg and is adjacent to the peroneus brevis muscle and the tibialis anterior muscle.
Greetings, i always seem to get a rather nasty cramp in my left leg. After insertion of a suture anchor, the lateral edge of the. Jan 14, 2019 the fdl arises from the medioposterior surface of the tibia and descends inferiorly through the leg towards the ankle joint. D2 was the shortest, meaning needle placement following technique by lee and delisa was closest to the actual midpoint of ehl. Middle and distal phalanges of lateral four digits. The extensor digitorum originates from the lateral epicondyle of the humerus insertion. Responsible for extending the four smaller toes as well as dorsiflexing the ankle, it is considered an extrinsic extensor of the foot in that it is located outside of the foot itself. The major artery is the anterior tibial artery, and the deep peroneal nerve courses along with. The extensor hallucis longus muscle ehl arises from. The extensor digitorum longus muscle is the most posterior together with lateral of the muscles in the. The extensor digitorum longus is a pennate muscle, situated at the lateral part of the front of the leg. Origin lower posterior shaft of ulna below extensor pollicis longus and adjacent interosseous membrane. Extensor digitorum longus muscle strain epainassist.
The extensor digitorum longus muscle is an anterior lower leg muscle. Insertion extensor expansion of index finger tendon lies on ulnar side of extensor digitorum tendon action extends all joints of index finger. The mucous sheaths of the tendons around the ankle. The extensor digitorum longus muscle has its origin on the lateral condyle of the tibia, the. The cramp seems to lessen in magnitude as my fitness improves. The anterior compartment, bounded by the tibia, interosseous membrane, and anterior intermuscular septum, contains the extensor muscles of the foot and ankle with the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles. After doing some googling around, i found that it is the extensor digitorum longus. Extensor digitorum longus muscle radiology reference.
Jan 24, 2018 the extensor digitorum longus muscle is situated in the front part of the leg and neighbors the peroneus brevis muscle and tibialis anterior muscle. Posterior surface of middle of ulna and interosseous membrane insertion. The extensor digitorum longus originates from the lateral condyle of the tibia and from the anterior surface of the head of the fibula, and also from the upper part of the. Flexor digitorum longus muscle attachments, actions. This muscle is occasionally united at its origin with extensor digitorum longus. Pdf extensor digitorum longus tenosynovitis caused by talar. The extensor digitorum muscle also known as extensor digitorum communis is a muscle of the posterior forearm present in humans and other animals.
Wrist extension by working synergistically with extensor carpi radialis brevis and extensor carpi ulnaris hand abduction radial deviation, with the help of flexor carpi radialis since extensor carpi radialis longus also spans the elbow, the muscle has a minimal contribution to elbow flexion. Versatility of the extensor digitorum brevis muscle flap in. Distal phalanges via dorsal mechanism of digits 25 extensor expansion. The extensor hallucis longus also extensor hallucis longus muscle, latin. The dorsalis pedis artery services the extensor hallucis brevis muscle with oxygenated blood and runs the length of the tibia, or shinbone. Occasionally united at its origin with the extensor digitorum longus the extensor ossis metatarsi hallucis, a small muscle, sometimes found as a slip from the extensor hallucis longus, or from the tibialis anterior, or from the extensor digitorum longus, or as a distinct muscle. Morphometric analysis of the extensor tendons of the hallux and. Peroneal artery peroneal branch of the posterior tibial artery nerve.
Origin common extensor origin on anterior aspect of lateral epicondyle of humerus. Extensor digitorum longus how is extensor digitorum longus. It has only a slightly smaller moment arm for dorsiflexion at the ankle than the anterior tibialis. Extensor digitorum definition of extensor digitorum by. Flexor digitorum longus muscle originates from the medial part of the posterior surface of the tibia, medial to the origin of tibialis posterior muscle and inferior to soleus muscle from here, the muscle fibers descend through the medial aspect of the posterior compartment of the leg. The gastrocnemius muscle bellies arise from medial and lateral origins on the. Apr, 2015 the dorsalis pedis artery services the extensor hallucis brevis muscle with oxygenated blood and runs the length of the tibia, or shinbone. 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.
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