Quadratus plantae
Flexor accessorius · Feet
- Origin
- Inner and outer sides of the underside of the calcaneus
- Insertion
- Tendon of the flexor digitorum longus
- Action
- Helps the flexor digitorum longus flex toes 2 to 5 and straightens its pull
- Nerve supply
- Lateral plantar nerve (S2–S3)
A flat muscle in the second layer of the sole that pulls on the long toe flexor tendon from behind, so the small toes curl straight rather than toward the inner side.
Quadratus plantae anatomy page →