Flexor digitorum longus
Musculus flexor digitorum longus
MuscularDeep musclesLegLeft and right
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- What it is
- Arises from the posterior surface of the tibia below the soleal line, on the medial side of the deep posterior compartment.
- Function
- Flexes the lateral four toes and helps plantarflex and invert the foot.
- Size
- Belly about 20 cm; about 35 cm with its tendons.
- Clinical note
- Just above the ankle it crosses superficial to tibialis posterior (the crural chiasm); its tendon is transferred to replace a failed tibialis posterior tendon.