Origin: Lateral head: attaches to the lateral side of the calcaneus and to the long plantar ligament
Medial Head: attaches to the medial surface of the calcaneus
Insertion: Attaches into the dorsal and plantar surface of the tendons of the flexor digitorum longus.
Actions: Assists with flexion of the four small toes
Innervation: Lateral plantar nerve (S1, S2, S3)
Blood Supply: Branches of the posterior tibial artery