Posterior Compartment of Leg Dr Muhammad Arsalan Dr

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Posterior Compartment of Leg Dr. Muhammad Arsalan Dr. Luqman Asghar

Posterior Compartment of Leg Dr. Muhammad Arsalan Dr. Luqman Asghar

Contents of the Posterior Fascial Compartments of the Leg • Muscles: • The deep

Contents of the Posterior Fascial Compartments of the Leg • Muscles: • The deep fascia of the leg forms a transverse intermuscular septum that divides the muscles of the posterior compartment into superficial and deep groups • Blood supply: Posterior tibial artery • Nerve supply: Tibial nerve

• Superficial group of Muscles: § Gastrocnemius § Plantaris § Soleus Together, the

• Superficial group of Muscles: § Gastrocnemius § Plantaris § Soleus Together, the soleus, gastrocnemius, and plantaris: (1) Act as powerful plantar flexors of the ankle joint (2) Provide the main forward propulsive force in walking and running by using the foot as a lever and raising the heel off the ground.

Gastrocnemius • Origin: § Lateral head: Lateral condyle of femur § Medial head: From

Gastrocnemius • Origin: § Lateral head: Lateral condyle of femur § Medial head: From above medial femoral condyle • Insertion: Posterior surface of calcaneum via Achilles tendon (tendo calcaneus) • Nerve supply: Tibial nerve • Action: § Ankle: Planter flexion § Knee: Assists flexion

Gastrocnemius

Gastrocnemius

Gastrocnemius

Gastrocnemius

Gastrocnemius

Gastrocnemius

Soleus • Origin: § Posterior surfaces of shafts of tibia and fibula • Insertion:

Soleus • Origin: § Posterior surfaces of shafts of tibia and fibula • Insertion: Posterior surface of calcaneum via Achilles tendon (tendo calcaneus) • Nerve supply: Tibial nerve • Action: § Ankle: Powerful planter flexion § Provides main propulsive force in walking and running

Soleus

Soleus

Soleus

Soleus

Plantaris • Origin: § Lateral supracondylar ridge of femur • Insertion: – Posterior surface

Plantaris • Origin: § Lateral supracondylar ridge of femur • Insertion: – Posterior surface of calcaneum via Achilles tendon (tendo calcaneus) • Nerve supply: Tibial nerve • Action: § Ankle: Planter flexion § Knee: Assists flexion

Plantaris

Plantaris

Plantaris

Plantaris

• Deep group of Muscles: § Popliteus § Flexor digitorum longus § Flexor

• Deep group of Muscles: § Popliteus § Flexor digitorum longus § Flexor hallucis longus § Tibialis posterior

Tibialis Posterior • Origin: § Posterior surface of shafts of tibia & fibula and

Tibialis Posterior • Origin: § Posterior surface of shafts of tibia & fibula and interosseous membrane • Insertion: Tuberosity of navicular bone and other neighboring bones • Nerve supply: Tibial nerve • Action: § Planter flexion at ankle joint § Inversion of foot at subtalar and transverse tarsal joints § Supports medial longitudinal arch of foot

TIBIALIS POSTERIOR

TIBIALIS POSTERIOR

TIBIALIS POSTERIOR

TIBIALIS POSTERIOR

Flexor Hallucis Longus • Origin: Distal 2/3 of posterior surface of shaft of fibula

Flexor Hallucis Longus • Origin: Distal 2/3 of posterior surface of shaft of fibula • Insertion: plantar surface of base of distal phalanx of big toe • Nerve supply: Tibial nerve • Action: § Flexes distal phalanx of big toe § Plantar flexion at ankle joint § Supports medial longitudinal arch of foot

FLEXOR HALLUCIS LONGUS

FLEXOR HALLUCIS LONGUS

FLEXOR HALLUCIS LONGUS

FLEXOR HALLUCIS LONGUS

FLEXOR HALLUCIS LONGUS

FLEXOR HALLUCIS LONGUS

Flexor Digitorum Longus • Origin: Posterior surface of shaft of tibia • Insertion: plantar

Flexor Digitorum Longus • Origin: Posterior surface of shaft of tibia • Insertion: plantar surface of base of distal phalanges of lateral four toes • Nerve supply: Tibial nerve • Action: • Flexion of distal phalanges of lateral four toes • Plantar flexion • Supports medial and lateral longitudinal arches of foot.

Flexor Digitorum Longus

Flexor Digitorum Longus

Flexor Digitorum Longus

Flexor Digitorum Longus

Popliteus • Lies in floor of popliteal fossa. • Origin: from the lateral surface

Popliteus • Lies in floor of popliteal fossa. • Origin: from the lateral surface of lateral condyle of femur • Insertion: Posterior surface of shaft of tibia above soleal line • Nerve Supply: Tibial nerve • Action: § Flexes leg at knee joint § Unlocks knee joint by lateral rotation of femur on tibia

POPLITEUS

POPLITEUS

POPLITEUS

POPLITEUS

POPLITEUS

POPLITEUS

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