- Flexor hallucis longus muscle
Muscle infobox
Name = Flexor hallucis longus muscle
Latin =
GraySubject = 129
GrayPage = 485
Caption = The mucous sheaths of the tendons around the ankle. Medial aspect. (Flexor hallucis longus visible at bottom center.)
Caption2 =
Width = 222
Origin =fibula , posterior aspect of upper 1/3
Insertion = base of distal phalanx ofhallux
Action = flexes all joints of thebig toe ,plantar flexion of theankle joint
Antagonist =Extensor hallucis longus muscle
Blood =Peroneal artery (peroneal branch of theposterior tibial artery
Nerve =tibial nerve , S1 & S2 nerve roots
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12549120
The Flexor hallucis longus muscle (FHL) is amuscle of theleg .It is one of the deep muscles of the posterior compartment of the leg. The other deep muscles of the leg areflexor digitorum longus andtibialis posterior . FHL is the largest and most powerful of these deep muscles.The Flexor hallucis longus is situated on the fibular side of the leg. It arises from the inferior two-thirds of the posterior surface of the body of the fibula, with the exception of 2.5 cm. at its lowest part; from the lower part of the interosseous membrane; from an intermuscular septum between it and the
Peronæi , laterally, and from the fascia covering theTibialis posterior , medially.The fibers pass obliquely downward and backward, and end in a tendon which occupies nearly the whole length of the posterior surface of the muscle.
This tendon lies in a groove which crosses the posterior surface of the lower end of the tibia, the posterior surface of the talus, and the under surface of the
sustentaculum tali of the calcaneus; in the sole of the foot it runs forward between the two heads of theFlexor hallucis brevis , and is inserted into the base of the last phalanx of thegreat toe . The grooves on the talus andcalcaneus , which contain the tendon of the muscle, are converted by tendinous fibers into distinct canals, lined by amucous sheath.As the tendon passes forward in the sole of the foot, it is situated above, and crosses from the lateral to the medial side of the tendon of the
Flexor digitorum longus , to which it is connected by a fibrous slip.Variations
Usually a slip runs to the Flexor digitorum and frequently an additional slip runs from the Flexor digitorum to the Flexor hallucis.
Peroneocalcaneus internus , rare, origin below or outside the Flexor hallucis from the back of the fibula, passes over the sustentaculum tali with the Flexor hallucis and is inserted into thecalcaneum .
=AdditionalExternal links
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* [http://www.ptcentral.com/muscles/musclelegs.html#flexor%20hallucis%20longus PTCentral]
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