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Posterior Leg Compartment
The posterior compartment of the leg contains flexor muscles that plantarflex the ankle joint
The posterior compartment of the leg contains flexor muscles that plantarflex the ankle joint
There is a Superficial Posterior Compartment and aDeep Posterior Compartment
The posterior compartment of the leg contains flexor muscles that plantarflex the ankle joint
There are 3 muscles in the Superficial Compartment
There are 3 muscles in the Superficial Compartment
•Gastrocnemius
•Plantaris
•Soleus
The posterior compartment of the leg contains flexor muscles that plantarflex the ankle joint
There are 4 muscles in the Deep Compartment
•Popliteus
•Flexor Digitorum Longus
•Flexor Hallucis Longus
•Tibialis Posterior
The posterior compartment of the leg contains flexor muscles that plantarflex the ankle joint
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Septum
Septum
Interosseous membrane
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Anterior Compartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Anterior Compartment
Lateral Compartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Anterior Compartment
Lateral Compartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Anterior Compartment
Lateral Compartment
Deep PosteriorCompartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Superficial Posterior Compartment
Deep PosteriorCompartment
Lateral Compartment
Anterior Compartment
Muscles of the Superficial Posterior
Compartment
Gastrocnemius
GastrocnemiusArises as two heads from the posterior surface of the
Medial and Lateral Femoral Condyles
Posterior view, right leg
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial HeadMedial Head
GastrocnemiusGastrocnemiusLateral headLateral head
Deep PosteriorCompartment
Soleus
Originates from the •posterior aspect of the fibular head •Fibular shaft•Tibial shaft
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
Deep PosteriorCompartment
Soleus and Gastrocnemiusmerge to form the Achilles tendon
This tendon inserts onto the posterior and superior surfaces of the Calcaneum
Plantaris
This slender muscle arises from the Lateral Supracondylar ridge of the Femur
and inserts onto the Calcaneum just medial to the Achilles Tendon
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartmentLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
PlantarisPlantaris
Muscles of the Deep Posterior Compartment
Popliteus
Originates from the posterior aspect of the upper Tibia
Popliteus
Originates from the posterior aspect of the upper Tibia
Inserts onto lateral surface of lateral condyle of Femur
Popliteus
This muscle contributes to the function of the knee joint by unlocking the extended leg and
rotating the Femur on the Tibia
Originates from the posterior aspect of the upper Tibia
Inserts onto lateral surface of lateral condyle of Femur
Tibialis Posterior
Originates from the posterior aspects of the•Interosseous membrane•Fibular shaft •Tibial shaft
Tibialis Posterior
Inserts onto the Navicular, and sends extensions to other tarsal bones and metatarsals
Originates from the posterior aspects of the•interosseous membrane•fibular shaft •tibial shaft
Tibialis Posterior
This is the principal invertor of the foot
Inserts onto the navicular, and sends extensions to other tarsal bones and metatarsals
Originates from the posterior aspects of the•interosseous membrane•fibular shaft •tibial shaft
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
PlantarisPlantaris
Tibialis PosteriorTibialis Posterior
Originates from the posterior aspect of theTibial shaft
Flexor Digitorum Longus
Originates from the posterior aspect of theTibial shaft
Flexor Digitorum Longus
Splits into 4 tendons which insert onto the distal phalanges of toes 2-5
Originates from the posterior aspect of thetibial shaft
Flexor Digitorum Longus
Flexes the toes
Splits into 4 tendons which insert onto the distal phalanges of toes 2-5
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
PlantarisPlantaris
Tibialis PosteriorTibialis Posterior Flexor Digitorum Flexor Digitorum LongusLongus
Flexor Hallucis LongusOriginates from the posterior aspect of theFibular shaft and Interosseous Membrane
Flexor Hallucis LongusOriginates from the posterior aspect of theFibular shaft and Interosseous Membrane
Inserts onto the distal phalanx of the big toe
Flexor Hallucis LongusOriginates from the posterior aspect of theFibular shaft and Interosseous Membrane
Inserts onto the distal phalanx of the big toe
Flexes the big toe
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
PlantarisPlantaris
Tibialis PosteriorTibialis Posterior Flexor Digitorum Flexor Digitorum LongusLongus
Flexor Hallucis LongusFlexor Hallucis Longus
Nerve Supply
All the muscles of the Posterior Compartment of the Leg
are supplied by the
Tibial Nerve
a terminal branch of the Sciatic Nerve
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIALLateral
Compartment
Anterior Compartment
GastrocnemiusGastrocnemiusMedial headMedial head
GastrocnemiusGastrocnemiusLateral headLateral head
SoleusSoleus
PlantarisPlantaris
Tibialis PosteriorTibialis Posterior Flexor Digitorum Flexor Digitorum LongusLongus
Flexor Hallucis LongusFlexor Hallucis Longus
Tibial Nerve
Summary of Muscles
GastrocnemiusOrigin Medial head: posterior surface of
medial femoral condyleLateral head: posterior surface of lateral femoral condyle
Insertion The two heads unite and with soleus form the Achilles tendon, which inserts onto the posterior and upper surface of calcaneum
Action Powerful plantar flexor of ankle
Nerve Supply Tibial nerve ( S1, S2)
Blood Supply Sural branches of the popliteal artery
Posterior Leg
SoleusOrigin Posterior aspect of fibular head,
posterior surface of upper fibular shaft, soleal line on posterior tibia and medial border of tibia
Insertion unites with gastrocnemius aponeurosis to form the Achilles tendon, inserts onto posterior and upper surfaces of calcaneum
Action Plantar flexor of ankle
Nerve Supply Tibial nerve (S1, S2)
Blood Supply Posterior tibial, peroneal, and sural arteries
Posterior Leg
PlantarisOrigin Inferior aspect of lateral
supracondylar ridge of distal femur
Insertion Posterior calcaneal surface, medial to Achilles tendon
Action Plantar flexor of ankle; also flexes knee
Nerve Supply Tibial nerve (L5, S1, S2)
Blood Supply Sural arteries
Posterior Leg
PopliteusOrigin Posterior surface of tibia,
superior to soleal lineInsertion Lateral surface of lateral condyle
of femur.The tendon passes into the capsule of the knee and gives an extension to posterior part of lateral meniscus
Action Unlocks the extended knee by laterally rotating the femur on the tibia.
Nerve Supply Tibial nerve (L4, L5, S1)Blood Supply Medial inferior genicular branch
of popliteal artery, posterior tibial artery
Posterior Leg
Tibialis PosteriorOrigin Posterior aspect interosseous
membrane, superior half of tibia and medial posterior surface of fibula
Insertion Inserts onto navicular tuberosity and sends extensions to other tarsal bones and metatarsals
Action Inverts, adducts, supinates foot, plantar flexes ankle
Nerve Supply Tibial nerve (L4, L5)
Blood Supply sural, peroneal and posterior tibial arteries
Posterior Leg
Flexor Digitorum LongusOrigin Posterior surface of tibia distal to
soleal lineInsertion Splits into four slips, inserts onto
plantar surface of bases of distal phalanges of 2nd-5th toes
Action Flexes toes 2 - 5; also helps in plantar flexion of ankle
Nerve Supply Tibial nerve (S1, S2) Blood Supply Muscular branches of posterior
tibial artery
Posterior Leg
Flexor Hallucis LongusOrigin Inferior 2/3 of posterior surface
of fibula, lower part of interosseous membrane
Insertion Plantar surface of base of distal phalanx of great toe
Action Flexes great toe, supinates ankle, weak ankle plantar flexor
Nerve Supply Tibial nerve (S2, S3)Blood Supply Muscular branches of peroneal
and posterior tibial artery
Posterior Leg