Intrinsic Muscles of the Foot - 2nd Layer

Question 1

Quadratus Plantae

Answer 1

origin: calcaneus
insertion: tendons of flexor digitorum longus
innervation: lateral plantar N.
action: pulls the tendons of the FDL so that they enter the toes straight

Question 2

Lumbricals (1-4)

Answer 2

origin: tendons of the flexor digitorum longus
insertion: extensor expansions of digits 2-5
innervation: lumbrical 1 - medial plantar N., lumbricals 2-4 - lateral plantar N.
action: flexion of the MP joint, extension of the PIP and DIP joints