Intrinsic Muscles of the Foot - 4th Layer

Question 1

Plantar Interossei

Answer 1

origin: metatarsals
insertion: proximal phalanx and extensor expansions of digits 3-5
innervation: deep branch of lateral plantar N.
action: adduction of digits 3-5

Question 2

Dorsal Interossei

Answer 2

origin: metatarsals
insertion: proximal phalanx and extensor expansions of digits 2-4
innervation: deep branch of lateral plantar N.
action: abduction of digits 2-4