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485
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The mucous sheaths of the tendons around the ankle Medial aspect (Flexor hallucis longus visible at bottom center)
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Muscles of the back of the leg Deep layer (Flexor hallucis longus visible at bottom center)
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Fibula , posterior aspect of upper 1/3
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base of distal Phalanx of Hallux
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flexes all joints of the Big Toe , plantar flexion of the Ankle joint
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Peroneal Artery (peroneal branch of the Posterior Tibial Artery
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Tibial Nerve , S1 & S2 nerve roots
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m_22
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The (FHL) is a
Muscle of 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 Longus and
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 tali of 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
Mucous 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.
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 .
