Muscular Compartment of Leg

INTRODUCTION:
  • The leg is divided into four compartments
  • Anterior compartment Lateral compartment
  • (Superficial) Posterior compartment
Deep posterior compartment Anterior Compartment:

MUSCLE ORIGIN INSERTION INNERVATION ACTION
Tibialis anterior (TA) Lateral condyle of tibia,
upper half/lateral surface of tibia,
interosseous membrane
Medial cuneiform base of 1s metatarsal Deep fibular (peroneal)
(L4-5)
Ankle dorsiflexion,
forefoot inversion
Extensor Digitorum
Longus (EDL)
Lateral condyle of tibia, ant surface of fibula,
interosseous membrane
Dorsum of base of middle phalanx,
dorsum of base of distal phalanx
Deep fibular (peroneal)
(L5-S1)
Extension of toes,
dorsiflexion of ankle
Extensor Hallucis Longus (EHL) Middle ½ of ant fibula, IM Distal phalanx of the great toe Deep fibular (peroneal)
(L5-S1)
Extend the great toe,
dorsiflex ankle
Fibularis(Peroneus) Tertius Distal 1/3 ant fibula,
interosseousmembrane
Dorsum shaft of 5th metatarsal Deep fibular (peroneal)
(L5-S1)
Forefoot eversion, weak ankle dorsiflexion
Lateral Compartment:

MUSCLE ORIGIN INSERTION INNERVATION ACTION
Fibularis (Peroneus) Longus (FL) head, upper 2/3 lateral surface of fibula inferolateral surface of medial cuneiform 1st metatarsal on its inferior surface superficial fibular (peroneal) (L5-S1 an) Forefoot eversion, ankleplantar flexion
Fibularis (Peroneus) Brevis (FB) lower 2/3 lateral fibula tuberosity on base of 5thmetatarsal superficial fibular (peroneal) (L5-S1) forefoot eversion,
ankle plantar flexion
(Superficial) Posterior compartment:

MUSCLE ORIGIN INSERTION INERVATION ACTION
Gastrocnemius
(Bounds Popliteal fossa)
medial and lateral condyles of femur Achilles tendon to calcaneum Tibial nerve Flexes foot; flexes leg used in normal walk during
DIstance and swing
Plantaris lateral supracondylar ridge of femur calcaneum Tibial nerve Plantar flexes foot; flexes leg
Soleus
(peripheral heart)
Shafts of tibia and fibula Achilles tendon into calcaneum Tibial nerve Plantar flexor of foot
Deep Posterior Compartment:

MUSCLE ORIGIN INSERTION INERVATION ACTION
Popliteus
(unlocker of knee)
Lateral condyle of femur
Lateral meniscus
proximal shaft of tibia Tibial nerve Plantarflex and medially rotate leg
Flexor digitorum longus Shaft of tibia distal phalanges of toe 2-5 Tibial nerve Plantarflex and invert foot, flex toe
Flexor hallucis longus shaft of fibula base of distal phalanx of big toe Tibial nerve Plantarflex and invert foot, flex to
Tibialis posterior Shafts of tibia and fibula & interosseous membrane
(passes deep to the flexor retinaculum)
Major tendon insertion passes to tuberosity of navicular
Posterior tendon slips pass to calcaneus
plantar surface of all 3 cuneiforms
cuboid and to base of 2nd, 3rd, and 4th metatarsals
Tibial nerve Plantarflex and invert foot
BLOOD SUPPLY:

COMPARTMENT BLOOD SUPPLY
Anterior Anterior tibial artery
Lateral No major arteries in lateral compartment
Muscular branches arise from the peroneal artery
(Branch of posterior tibial)
Posterior superficial Popliteal artery(Gastrocnemius)
Peroneal artery proximally and the posterior tibial artery distally( SOLEUS)
Deep superficial posterior tibial artery
Exam Question
  • Popliteus muscle is also called unlocker of knee
  • Peroneus longus is inserted into medial cuneiform
  • Peroneus longus causes eversion of ankle
  • Gastrocnemius is used in normal walk during DIstance and swing
  • Tibialis posterior passes deep to the flexor retinaculum
  • Tibialis posterior is inserted in Calcaneus,Intermediate cuneiform & Cuboid
  • Boundaries of Popliteal fossa is formed by Biceps femoris, Both heads of Gastrocnemius & Adductor magnus
  • Peroneus brevis is attached to the tuberosity of the 5th metatarsal
  • Gastrocnemius & plantaris muscles acts both at knee and ankle joint
  • Extensor digitorum longus, Extensor hallucis longus, Tibialis anterior & Peroneus tertius causes dorsiflexion of ankle
  • Plantaris , FHL , FDL, Soleus, popliteus, peroneus longus, peroneus brevis, Tibialis posterior all causes Plantar flexion
  • Tibialis anterior, Extensor DigitorumLongus , Extensor Hallucis Longus & Peroneus tertius are the muscles of the anterior compartment of the leg
  • Popliteus muscle is supplied by tibial nerve
  • Soleus is also called peripheral heart
Don't Forget to Solve all the previous Year Question asked on Muscular Compartment of Leg