Quadratus Plantae

http://www.podiatry-arena.com/podiatry-forum/showthread.php?t=68238
https://www.facebook.com/169366033103080/videos/971182206254788/

Flexor accessorius/quadratus plantae:
Proximal attachment – two attachment from medial and lateral plantar aspect of calcaneus, seperated by attachment of long plantar ligament
Distal attachment – tendon of flexor digitorum longus
Open chain function – straightens pull of FDL to lateral digits
Nerve supply – lateral plantar
Arterial supply – lateral plantar nerve