Lumbricals:Origin, Insertion, Action & Nerve Supply
The lumbricals are four small skeletal muscles in the foot. They are each located medial to their corresponding tendon of the flexor digitorum longus muscle.
Origin: Originates from the tendons of flexor digitorum longus.
Insertion: Attaches to the extensor hoods of the lateral four digits( Dorsal extensor expansion).
Function: Extend toes at interphalangeal joints and flex metatarsal-phalangeal joints
Nerve Supply: The most medial lumbrical is innervated by the medial plantar nerve(L4,5). The remaining three lumbrical muscles are innervated by the lateral plantar nerve(S2,3).