Foot Muscles: Layers 1-2

Extensor Digitorum Brevis Origin

calcaneus (EDB)

Extensor Digitorum Brevis Insertion

tendons of EDL

Extensor Digitorum Brevis Action

extension of digits 2-4

Extensor Digitorum Brevis Innervation

deep fibular N (EDB)

extensor hallucis brevis Origin

calcaneus (EHB)

extensor hallucis brevis insertion

base proximal phalanx 1

extensor hallucis brevis action

extension of MP joint 1

extensor hallucis brevis innervation

deep fibular N (EHB)

plantar aponeurosis "origin"

calcaneal tuberosity

plantar aponeurosis "insertion"

distal phalanges 1-5

plantar aponeurosis "action"

protection of deep muscles

Abductor Hallucis Origin

calcaneal tuberosity

Abductor Hallucis Insertion

medial base proximal phalanx 1

Abductor Hallucis Action

abduction of hallux at MP; Accessory flex MP 1

Abductor Hallucis innervation

medial plantar N

Flexor Digitorum Brevis Origin

calcaneal tuberosity; plantar aponeurosis

Flexor Digitorum Brevis Insertion

plantar surface middle phalanges 2-5

Flexor Digitorum Brevis Action

flexion of digits at proximal IP joints

Flexor Digitorum Brevis Innervation

medial plantar N (FDB)

Abductor Digiti Minimi Origin

calcaneal tuberosity; connective tissue between calcaneus and metatarsal 5

Abductor Digiti Minimi Insertion

lateral base proximal phalanx 5

Abductor Digiti Minimi Innervation

lateral plantar N

Abductor Digiti Minimi Action

abduction of MP 5

Quadratus Plantae Origin

medial surface calcaneus; calcaneal tuberosity

Quadratus Plantae Insertion

tendon of flexor digitorum longus (plantar)

Quadratus Plantae Action

assists FDL flexion of digits

Quadratus Plantae Innervation

lateral plantar N (QP)

Lumbricals Origin 1

tendon of FDL associated with digit 2 (medially)

Lumbricals Origin 2-4

adjacent surfaces of adjacent tendons FDL

Lumbricals Insertion

medial margins of extensor hoods 2-5

Lumbricals Innervation 1

medial plantar N (L)

Lumbricals Innervation 2-4

lateral plantar N (L)

Lumbricals Action

flexion of MP joint in extension of IP joints