- Flexor hallucis longus muscle
Name = Flexor hallucis longus muscle
GraySubject = 129
GrayPage = 485
Caption = The mucous sheaths of the tendons around the ankle. Medial aspect. (Flexor hallucis longus visible at bottom center.)
Width = 222
fibula, posterior aspect of upper 1/3
Insertion = base of distal phalanx of
Action = flexes all joints of the
big toe, plantar flexionof the anklejoint
Extensor hallucis longus muscle
Peroneal artery(peroneal branch of the posterior tibial artery
tibial nerve, S1 & S2 nerve roots
DorlandsPre = m_22
DorlandsSuf = 12549120
The Flexor hallucis longus muscle (FHL) is a
muscleof the leg.It is one of the deep muscles of the posterior compartment of the leg. The other deep muscles of the leg are flexor digitorum longusand tibialis 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 the Tibialis 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 taliof the calcaneus; in the sole of the foot it runs forward between the two heads of the Flexor hallucis brevis, and is inserted into the base of the last phalanx of the great toe. The grooves on the talus and calcaneus, which contain the tendon of the muscle, are converted by tendinous fibers into distinct canals, lined by a mucoussheath.
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.
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 the calcaneum.
* [http://www.ptcentral.com/muscles/musclelegs.html#flexor%20hallucis%20longus PTCentral]
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