Flexor hallucis longus muscle

Inferior view of flexor hallucis longus muscle - animation

The flexor hallucis longus muscle (FHL) is one of the deep muscles of the posterior compartment of the leg. It is situated on the fibular side of the leg. The FHL is a powerful muscle that is essential for activities such as walking, running, and jumping.

Structure

The flexor hallucis longus muscle originates from the posterior aspect of the middle third of the fibula and the adjacent interosseous membrane. It descends along the leg, passing through the tarsal tunnel and inserting into the base of the distal phalanx of the big toe (hallux).

Innervation

The FHL is innervated by the tibial nerve, specifically from the S2 and S3 nerve roots.

Blood Supply

The primary blood supply to the flexor hallucis longus muscle is provided by the peroneal artery.

Function

The main function of the flexor hallucis longus muscle is to flex the joints of the big toe. It also assists in the plantar flexion of the ankle joint. This muscle plays a crucial role in the push-off phase of walking and running, providing the necessary force to propel the body forward.

Clinical Significance

Injuries to the flexor hallucis longus muscle can result in pain and difficulty in performing activities that involve the big toe. Conditions such as tendinitis or tenosynovitis can affect the FHL, often seen in athletes and dancers.

Related Pages

• Flexor digitorum longus muscle
• Extensor hallucis longus muscle
• Tibialis posterior muscle
• Tibial nerve
• Plantar flexion
• Tarsal tunnel

See Also

• Muscles of the leg
• Posterior compartment of the leg

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