Slideshow: Anterior Leg

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The Anterior Leg

Transcript of Slideshow: Anterior Leg

Page 1: Slideshow: Anterior Leg

The Anterior Leg

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The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint

Page 3: Slideshow: Anterior Leg

The anterior compartment of the leg contains extensor muscles that dorsiflex the ankle joint

There are four muscles

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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

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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

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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

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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

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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

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Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

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Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

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Septum

Septum

InterosseousMembrane

Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

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Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

Deep PosteriorCompartment

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Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

Deep PosteriorCompartment

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Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

Deep PosteriorCompartment

Superficial Posterior Compartment

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Tibia

Fibula

Cross Section through middle of right leg looking up from foot

anterioranterior

posteriorposterior

LATERAL

MEDIAL

Deep PosteriorCompartment

Lateral Compartment

Superficial Posterior Compartment

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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

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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

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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

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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

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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

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Tibialis Anterior

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Tibialis Anterior

arises from lateral surface of shaft of Tibia

attaches to Medial Cuneiform 1st Metatarsal base

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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

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Tibialis Anterior

Dorsiflexes ankle joint

Inverts foot

Tibialis anterior muscleTibialis anterior muscle

Tibialis anterior tendonTibialis anterior tendon

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Extensor Digitorum Longus

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Extensor Digitorum Longus

Arises from Fibula Interosseous Membrane

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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

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The tendon divides into four slips and these insert into the dorsal expansions of toes 2-5

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Extensor Digitorum Longus

Dorsiflexes the ankle joint

Extends the toes

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Extensor Hallucis Longus

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Extensor Hallucis Longus

Arises from the

Fibula

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Extensor Hallucis Longus

Arises from the

Fibula

Inserts onto the

Distal Phalanx of Big Toe

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Tendon of Extensor Hallucis Longus

Extensor Hallucis Longus

Extends the Big Toe

Dorsiflexes Ankle Joint

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Peroneus Tertius

also known as

Fibularis Tertius

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Peroneus Tertius

Arises from the

Fibula

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Peroneus Tertius

Arises from the

Fibula

Inserts onto dorsum of

5th metatarsal base

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Peroneus Tertius

Tendon of Peroneus Tertius

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Tendon of Peroneus Tertius

Peroneus Tertius

Everts foot Dorsiflexor of the foot

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Extensor Retinacula are thickenings of deep fascia that prevent ‘bowstringing’ of the extensor tendons

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Extensor Retinacula are thickenings of deep fascia that prevent ‘bowstringing’ of the extensor tendons

Superior extensor retinaculum

Inferior extensor retinaculum

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Nerve Supply

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All the muscles in the Anterior Compartment are supplied by the

Deep Peroneal Nerve

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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’

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Summary of Muscles

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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

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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

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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

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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