Quadratus plantae (flexor accessorius) uniquely inserts on a tendon rather than bone, modifying the FDL vector. Without QP, toes would be pulled in a deviated direction during flexion.
An expanded entry for Quadratus Plantae.
| Origin | Medial and lateral calcaneal surfaces, two heads |
|---|---|
| Insertion | Lateral border of the FDL tendon before its division |
| Nerve Supply | Lateral plantar nerve (S1, S2, S3) |
| Blood Supply | Lateral plantar artery |
| Actions |
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|---|
It corrects the oblique pull of the flexor digitorum longus tendons so that the toes flex in a straight line.
Involved in flatfoot surgery where medial column lengthening alters FDL mechanics. The calcaneal origin is addressed in endoscopic plantar fascia release where the adjacent attachment must be identified.
Not directly palpable, the deepest plantar layer.
QP origin disruption from displaced calcaneal fracture altering the FDL vector, contributing to functional deficit addressed during surgical reduction.
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