Muscles of the Foot (Plantar - Second Layer)

Question 1

Quadratus Plantae

Answer 1

O: medial and lateral sides of plantar surface of the calcaneus

I: lateral and posterior margin of tendon of the flexor digitorum longus

A: aids in flexion of lateral four toes by modifying pull by flexor digitorum longus tendon

In: lateral plantar nerve

Question 2

Lumbricals

Answer 2

O: flexor digitorum longus tendon

I: expansions of extensor tendons of lateral four toes

A: flexion of metatarsophalangeal joints, possible extension of interphalangeal joints

In: medial plantar nerve to first lumbricale, lateral plantar nerve to the second - fourth lumbricale