Posterior Leg + Deep layers of foot

Gastrocnemius

O: Medial + lateral femoral condyles, posteriorly

I: Achilles tendon

A: Knee flexion (Weak); PF

I: Tibial N

Soleus

O: Soleal line of tibia + head of fibula

I: achilles tendon

A: PF

I: Tibial N

Plantaris

O: Posterior lateral femoral condyle

I: achilles

A: Weak knee flexion + PF

I: tibial N

Popliteus

O: Lateral femoral condyle, posterior

I: post proximal tibia

A: Unlock knee (initiates flexion)

I: Tibial N

Tibialis Posterior

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

I: base of 2-4 metatarsal + Tarsal bones (NOT TALUS)

A: Subtalar inversion + ankle PF

I: tibial N

Flexor Hallucis longus (FHL)

O: posterior distal 2/3 fibula

I: distal phalanx of big toe

A: flex big toe @ MTP + IP

I: Tibial N

Flexor digitorum longus (FDL)

O: Medial posterior tibia inferior to soleal line; fibula

I: distal phalanges of 2-5

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

I: tibial N

Flexor digitorum brevis

O: medial calcaneal tuberosity + plantar aponeurosis

I: both sides of base of middle phalanx toes 2-4

A: flex digits 2-5 @ MTP + PIP

I: medial planar N → bc middle of foot

Abductor hallucis

O: medial calcaneus + plantar aponeurosis

I: base of proximal phalanx of big toe, medially

A: abduct big toe @ MTP

I: medial plantar N

Abductor digiti minimi

O: Medial + lateral calcaneal tubercle + plantar aponeurosis

I: base of prox phalanx of pinky toe laterally

A: abduct pinky @ MTP

I: lateral plantar N

Quadratus plantae

O: medial + lateral plantar surface of calcaenus (2 tendons)

I: tendon of flexor digitorum longus

A: help FDL to pull w more mechanical efficiency

I: lateral plantar N

Lumbricals

O: tendons of FDL

I: tendons of EDL, proximal phalanges of 2-5

A: MTP flexion + IP extension

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

Flexor hallucis Brevis

O: cuboid + 3rd cuneiform

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

A: flex big toe @ MTP

I: medial plantar N

Adductor Hallucis Oblique head

O: base of 2-4 + Fibularis longus tendon (oblique head)

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

A: adduct big toe @ MTP

I: Lateral plantar n → inserts on lateral aspect of big toe

Flexor digiti minimi brevis

O: Base of 5th

I: base of proximal phalanx of pinky toe

A: flex pinky toe @ MTP

I: lateral plantar N

Plantar Interossei - 3 PAD

O: metatarsals 3-5, medially

I: medial proximal phalanges 3-5

A: adduct digits 3-5 @ MTP

I: Lateral plantar N

Adductor Hallucis - Transverse head

O: metatarsals 3-5

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

A: adduct big toe @ MTP

I: lateral plantar N