Foot Muscles: Layers 3-4

Flexor Hallucis Brevis Origin

plantar surface cuboid & lateral cuneiform; tendon of tibialis posterior

Flexor Hallucis Brevis Insertion

lateral & medial sides of base proximal phalanx 1

Flexor Hallucis Brevis Action

flexion of MP joint 1

Flexor Hallucis Brevis Innervation

medial plantar N

Adductor Hallucis Origin

ligaments of MP joints 3-5; base metatarsals 2-4; sheath covering fibularis longus

Adductor Hallucis Insertion

lateral base proximal phalanx 1

Adductor Hallucis Innervation

lateral plantar N (AH)

Adductor Hallucis Action

adduction of MP joint 1

flexor digiti minimi brevis origin

base metatarsal 5; tendon sheath fibularis longus

flexor digiti minimi brevis insertion

lateral base proximal phalanx 5

flexor digiti minimi brevis innervation

lateral plantar N

flexor digiti minimi brevis action

flexion of MP joint 5

plantar interossei origin

medial metatarsals 3-5

plantar interossei insertion

extensor hoods 3-5; base proximal phalanges 3-5

plantar interossei innervation

lateral plantar N (PI)

plantar interossei action

adduction digits 3-5; resist extension of MP; resist flexion of IP joints

dorsal interossei Origin

sides of adjacent metatarsals

dorsal interossei Insertion

extensor hoods; base proximal phalanges 2-4

dorsal interossei Innervation 1-2

deep fibular N & lateral plantar N

dorsal interossei innervation 3-4

lateral plantar N

dorsal interossei Action

abduction of MP joints 2-4; resist extension of MP joints; resist flexion of IP joints