Post on 14-Jan-2017
The Anterior Leg
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
Extensor Digitorum Longus
Extensor Hallucis LongusAlso extend the toes
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
Extensor Digitorum Longus
Extensor Hallucis Longus
Tibialis Anterior
Also extend the toes
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
Extensor Digitorum Longus
Extensor Hallucis Longus
Tibialis Anterior – also inverts the foot
Also extend the toes
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
Extensor Digitorum Longus
Extensor Hallucis Longus
Tibialis Anterior – also inverts the foot
Peroneus Tertius
Also extend the toes
The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint
There are four muscles
Extensor Digitorum Longus
Extensor Hallucis Longus
Tibialis Anterior – also inverts the foot
Peroneus Tertius – also known as Fibularis Tertius
Also extend the toes
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
InterosseousMembrane
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
Deep PosteriorCompartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Superficial Posterior Compartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Superficial Posterior Compartment
Tibia
Fibula
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Anterior Compartment
Superficial Posterior Compartment
Deep PosteriorCompartment
Tibia
Fibula
Tibialis Anterior
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Superficial Posterior Compartment
Deep PosteriorCompartment
Tibia
Fibula
Tibialis AnteriorTibialis AnteriorExtensor Extensor Hallucis Hallucis LongusLongus
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
LATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Superficial Posterior Compartment
Deep PosteriorCompartment
Tibia
Fibula
Tibialis AnteriorTibialis AnteriorExtensor Extensor Hallucis Hallucis LongusLongus
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
Extensor Extensor Digitorum Digitorum
LongusLongusLATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Superficial Posterior Compartment
Deep PosteriorCompartment
Tibia
Fibula
Tibialis AnteriorTibialis AnteriorExtensor Extensor Hallucis Hallucis LongusLongus
Cross Section through middle of right leg looking up from foot
anterioranterior
posteriorposterior
Extensor Extensor Digitorum Digitorum
LongusLongusLATERAL
MEDIAL
Deep PosteriorCompartment
Lateral Compartment
Superficial Posterior Compartment
Tibialis Anterior
Tibialis Anterior
arises from lateral surface of shaft of Tibia
attaches to Medial Cuneiform 1st Metatarsal base
Tibialis anterior muscleTibialis anterior muscle
Tibialis anterior tendonTibialis anterior tendon
Tibialis Anterior
arises from lateral surface of shaft of Tibia
attaches to Medial Cuneiform 1st Metatarsal base
Tibialis Anterior
Dorsiflexes ankle joint
Inverts foot
Tibialis anterior muscleTibialis anterior muscle
Tibialis anterior tendonTibialis anterior tendon
Extensor Digitorum Longus
Extensor Digitorum Longus
Arises from Fibula Interosseous Membrane
Extensor Digitorum Longus
Arises from Fibula Interosseous Membrane
The tendon divides into four slips and these insert into the dorsal expansions of toes 2-5
The tendon divides into four slips and these insert into the dorsal expansions of toes 2-5
Extensor Digitorum Longus
Dorsiflexes the ankle joint
Extends the toes
Extensor Hallucis Longus
Extensor Hallucis Longus
Arises from the
Fibula
Extensor Hallucis Longus
Arises from the
Fibula
Inserts onto the
Distal Phalanx of Big Toe
Tendon of Extensor Hallucis Longus
Extensor Hallucis Longus
Extends the Big Toe
Dorsiflexes Ankle Joint
Peroneus Tertius
also known as
Fibularis Tertius
Peroneus Tertius
Arises from the
Fibula
Peroneus Tertius
Arises from the
Fibula
Inserts onto dorsum of
5th metatarsal base
Peroneus Tertius
Tendon of Peroneus Tertius
Tendon of Peroneus Tertius
Peroneus Tertius
Everts foot Dorsiflexor of the foot
Extensor Retinacula are thickenings of deep fascia that prevent ‘bowstringing’ of the extensor tendons
Extensor Retinacula are thickenings of deep fascia that prevent ‘bowstringing’ of the extensor tendons
Superior extensor retinaculum
Inferior extensor retinaculum
Nerve Supply
All the muscles in the Anterior Compartment are supplied by the
Deep Peroneal Nerve
Deep Peroneal Nerve
Injury to this nerve causes a condition known as ‘foot drop’
The foot can no longer be dorsiflexed which causes difficulty in walking
The knee has to be lifted much higher in order to prevent the foot from dragging on the ground
This is called a ‘High Stepping Gait’
Summary of Muscles
Anterior Leg
Tibialis AnteriorOrigin Lateral condyle of tibia, proximal
2/3rds lateral surface tibia, interosseous membrane
Insertion Medial and plantar surfaces of medial cuneiform and base of first metatarsal
Action Dorsiflexor of ankle, invertor of foot
Nerve Supply Deep peroneal nerve (L4, L5)Blood Supply Anterior tibial artery
Extensor Digitorum LongusOrigin Head of fibula, upper 2/3 anterior
fibular shaft, interosseous membrane
Insertion Splits into 4 tendons distally; these insert onto dorsum of middle and distal phalanges of toes 2-5. Part of extensor expansion complex
Action Extends toes 2 - 5 and dorsiflexes ankle
Nerve Supply Deep peroneal nerve (L5, S1)
Blood Supply Anterior tibial artery
Anterior Leg
Extensor Hallucis LongusOrigin Anterior surface of the fibula,
interosseous membraneInsertion Base of distal phalanx great toe
Action Extends great toe and dorsiflexes ankle
Nerve Supply Deep peroneal nerve (L5, S1)
Blood Supply Anterior tibial artery
Anterior Leg
Anterior Leg
Fibularis TertiusOrigin Distal 1/3rd anterior surface of
fibulaInsertion Base of dorsal aspect 5th
metatarsalAction Dorsiflexes foot;
everts foot weaklyNerve Supply Deep peroneal nerve (L5, S1)
Blood Supply Anterior tibial artery