Lateral Leg + Foot Anatomy

Tibialis Posterior

O: Proximal posterior 2/3 tibia, fibula and IM

I: base of 2-4th metatarsals and tarsals bones (except talus)

A: Subtalar inversion + plantarflexion

I: Tibial N

Flexor Hallucis Longus

O: Posterior, distal 2/3 fibula

I: Distal phalanx of big toe

A: Flexion of Big toe @ MTP + IP

I: Tibial N

Popliteus

O: Lateral temoral condyle, posteriorly

I: Posterior proximal tibia

A: unlock knee

I: Tibial N

Flexor Digitorum Longus

O: Medial posterior tibia inferior to soleal line; fibula

I: Distal phalanges toes 2-5

A: Flexion of digits 2-5 @ MTPs, PIP, DIPs

I: Tibial N

Tibialis Anterior

O: Lateral tibial condyle, proximal 2/3 of tibia and IM

I: Base of 1st metatarsal + cuneiform

A: Subtalar inversion + dorsiflex

I: Deep Fibular N

Extensor Hallucis Longus

O: Anterior fibular and IM (middle aspect)

I: Base distal phalanx big toe, dorsally

A: extend big toe @ MTP + IP

I: Deep fibular N

Extensor Digitorum Longus

O: Lateral tibial condyle, prox 2/3 anterior fibula + IM

I: Middle and distal phalanges 2-5 (via dorsal expansion)

A: Extends 2-5 digits @ MTP, PIP, DIP

I: Deep fibular N

Fibularis Longus

O: Proximal lateral 2/3 fibula

I: Medial cuneiform + base of 1st metatarsal

A: Eversion of subtalar/transverse tarsal joints; weak ankle pf

I: Superficial fibular N

Fibularis Brevis

O: Mid-lateral fibula

I: base of 5th metatarsal

A: eversion of subtalar/transverse tarsal joints

I: superifical fibular N

Fibularis Tertius

O: Distal 1/3 medial fibula and IM

I: Base of 5th metatarsal

A: eversion of subtalar/transverse tarsal joints

I: Deep fibular N

Extensor Hallucis Brevis

O: Calcaneus

I: Proximal phalanx of 1st toe

A: Extends big toe @ MTP

I: Deep fibular N

Extensor Digitorum Brevis

O: Calcaneus

I: Middle phalanges of toes 2-5

A: Extends 2-5 @ MTP & PIP

I: Deep fibular N

Abductor Hallucis

O: Medial calcaneus + plantar aponeurosis

I: Base of prox phalanx of big toe, medially

A: Abduct big toe @ MTP

I: Medial plantar N

Abductor Digiti Minimi

O: medial + lateral calcaneal tubercles and plantar aponeurosis

I: base of prox phalanx of pinky toe, laterally

A: abduct digit 5 @ MTP

I: Lateral plantar N

Flexor digitorum brevis

O: Medial calcaneal tuberosity + plantar aponeurosis

I: Both sides of base of middle phalanx toes 2-5

A: Flexes digits 2-5 @ MTP & PIP

I: Medial planar N

Quadratus Plantae

O: medial and lateral plantar surface calceanues (2 tendons)

I: tendon of flexor digitorum longus

A: assist FDL to pull w/ more efficiency

I: lateral plantar N

Lumbricals

O: tendons of FDL

I: tendons of EDL on prox phalanges of toes 2-5

A: MTP flexion and IP extension

I: medial plantar N (1-2) lateral plantar N (3-4)

Adductor Hallucis

O: base of metatarsals 2-4 + fibularis long tendon (oblique head) & 3-5 metatarsals head (transverse head)

I: lateral side of base of proximal phalanx-big toe

A: adduction of digit 1 @ MTP

I: lateral plantar N

Flexor hallucis brevis

O: cuboid and 3rd cuneiform

I: both sides of base of proximal phalanx of big toe

A: flexes digit 1 @ MTP

I: medial plantar N

Flexor Digiti Minimi Brevis

O: Base of 5th metatarsal

I: base of proximal phalanx of 5th toe

A: flexes digit 5 @ MTP

I: lateral plantar N

Plantar Interossei (3 PAD)

O: adjacent sides of metatarsals 3-5, medially

I: medial proximal phalanges 3-5

A: adduction of digits 3-5 @ MTP

I: lateral plantar N

Dorsal Interossei (4 DAB)

O: Adjacent sides of metatarsals 1-5

I: prox phalanges 2-4

A: abduction of digits 2-4 @ MTP

I: lateral plantar N