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Quadratus plantae

Other Terms: Flexor digitorum accessorius, Flexor accessorius, Quadratus plantae, Musculus flexor accessorius, Musculus quadratus plantae, Muscle carré plantaire

Muscle parts

None

Latin name

Musculus quadratus plantae or Musculus flexor accessorius

Latin muscle parts

None

Group

Foot muscle – plantar group – second layer

Etymology

The muscle’s name in English is the square muscle of the sole of the foot. The word quadratus comes from the Latin quadrus meaning “square.” The word plantaris is from the Latin planta for “the sole of the foot,” which comes from the Greek plata meaning “flat.”

Origin

Concave medial surface of the calcaneus (medial head); long plantar ligament and distal surface of the calcaneal tuberosity (lateral head).

Insertion

Lateral edge of the flexor digitorum longus tendon before it splits.

Action

Assists with flexion of the small toes by correcting the oblique vector of the flexor tendon as it crosses the plantar surface of the foot.

Nerve supply

Lateral plantar nerve (S1, S2, and S3)

Blood supply

Both medial and lateral plantar arteries supply the muscle along with small branches from the plantar arterial arch.

Latin

Musculus flexor accessorius

Latin

Musculus quadratus plantae

French

Muscle carré plantaire

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