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The Quadratus Plantae is an intrinsic muscle of the foot located in Plantar Layer II. The muscles located in Plantar Layer II are:
- Quadratus plantae
- Lumbricals pedis
- Calcaneus to the distal tendon of the flexor digitorum longus muscle.
- The proximal attachment is onto the medial and lateral sides of the calcaneus.
- Flexes toes #2-5 at the metatarsophalangeal and proximal and distal interphalangeal joints.
- The main function of the quadratus plantae is to straighten out the line of pull of the flexor digitorum longus so that the toes are not splayed to the medial side when they flex.
- The quadratus plantae used to be called the flexor digitorum accessorius.