MUSCLE OF THE LEG
1) ANTERIOR LEG MUSCLE
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| Anterior Leg Muscles |
1) Tibialis anterior
2) Extensor hallucis longus
3) Extensor digitorum longus
4) Extensor digitorum brevis
5) Peroneus tertius
1) TIBIALIS ANTERIOR
1) TIBIALIS ANTERIOR
ORIGIN: Lateral tibial condyle and upper 2/3 of
lateral surface of tibia, interosseous membrane.
INSERTION: Medial and inferior surface of medial cuneiform, base of first metatarsal.
NERVE SUPPLY: Deep peroneal nerve (L4,L5).
ACTION: Dorsiflexes and inverts ankle.
2) EXTENSOR HALLUCIS LONGUS
2) EXTENSOR HALLUCIS LONGUS
ORIGIN: Fibula (shaft, middle ½ of medial aspect), interosseous membrane.
INSERTION: Hallux (distal phalanx, dorsal aspect of bases), expansion to proximal phalanx.
NERVE: Deep peroneal nerve (L5).
ACTION: Extends great toe, ankle dorsiflexor.
3) EXTENSOR DIGITORUM LONGUS
3) EXTENSOR DIGITORUM LONGUS
ORIGIN: Upper three quarter of medial surface of fibula, interosseous membrane, lateral tibial condyle.
INSERTION: Middle and distal phalanges of four lateral toes.
NERVE SUPPLY: Deep peroneal nerve (L5, S1).
4) EXTENSOR DIGITORUM BREVIS
4) EXTENSOR DIGITORUM BREVIS
ORIGIN: Calcaneus (anterior superolateral surface), lateral talocalcaneal ligament. Extensor retina-culum (inferior).
INSERTION: Base of proximal phalanx of great toe, lateral side of dorsal hood of adjacent three toes.
NERVE SUPPLY: Deep peroneal nerve (L5, S1).
ACTION: Extends great toe and adjacent three toes.
5) PERONEUS TERTIUS
5) PERONEUS TERTIUS
ORIGIN: Distal third of medial surface of fibula, interosseous membrane, intermuscular septum.
INSERTION: Medial aspect of base of fifth metatarsal.
NERVE SUPPLY: Deep peroneal nerve (L5, S1).
ACTION: Everts and dorsiflexes ankle.
2) POSTERIOR LEG MUSCLES
A) Superficial muscle of posterior leg
(CALF MUSCLE)
(mnemonic :- GPS)
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| Superficial Muscle of Posterior Leg Muscle |
There are three muscle in superficially to posterior compartment of leg muscle
1) G – Gastronimius
2) P – Plantaris
3) S – Soleus
1) GASTROCNEMIUS
1) GASTROCNEMIUS
ORIGIN:
Medial head—femur (posterior part of medial condyle).
Lateral head—femur (lateral surface of lateral
condyle).
INSERTION: Posterior surface of calcaneus.
NERVE SUPPLY: Tibial nerve (S1, S2).
ACTION: Plantar flexes ankle, flexes knee.
2) PLANTARIS
2) PLANTARIS
ORIGIN: Lateral supra condylar ridge, oblique popliteal ligament.
INSERTION: Tendocalcaneus.
NERVE SUPPLY: Tibial nerve (S1, S2).
ACTION: Plantar flexes ankle, flexes knee.
3) SOLEUS
3) SOLEUS
ORIGIN: Soleal line and middle third of medial border of tibia, posterior surface of head and upper quarter of fibula, fibrous arch between tibia and fibula.
INSERTION: Posterior surface of calcaneus.
NERVE SUPPLY: Tibial nerve (S1, S2).
ACTION: Plantar flexes ankle.
B) Deep muscle of posterior leg
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| Deep Muscle of Posterior Leg |
1) Tibialis posterior
2) Flexors hallucis longus —–
3) Flexors digitorum longus —–
4) Popliteus
1) TIBIALIS POSTERIOR
1) TIBIALIS POSTERIOR
ORIGIN: Tibia (lateral aspect of posterior surface, below soleal line, interosseous membrane, upper half of posterior surface of fibula, deep transverse fascia).
INSERTION: Tuberosity of navicular, medial cunei- form, sustentaculum tali, intermediate cuneiform, base of second to fourth metatarsals.
NERVE SUPPLY: Tibial nerve (L4,5).
ACTION: Plantar flexes and inverts ankle.
2) FLEXOR HALLUCIS LONGUS
2) FLEXOR HALLUCIS LONGUS
ORIGIN : Lower 2/3 of posterior fibula between median crest and posterior border
INSERTION: Base of distal phalanx of big toe
NERVE SUPPLY: Tibial nerve ( S2, S3 )
ACTION: Flexion of distal phalnx of big toe and Plantar flexes of ankle
3) FLEXOR HALLUCIS BREVIS
3) FLEXOR HALLUCIS BREVIS
INSERTION:
Medial head : medial side of base of proximal phalanx
lateral head : lateral side of base of proximal phalanx
NERVE SUPPLY: Medial planter nerve ( S2, S3 )
ACTION: flexion of metacarpophalgeal joint of big toe
4) POPLITEUS
4) POPLITEUS
ORIGIN: Outer surface of lateral femoral condyle.
INSERTION: Posterior surface of tibia above soleal line.
NERVE SUPPLY: Tibial nerve (L4–S1).
ACTION: Medially rotates tibia, flexes knee.
3) LETRAL LEG MUSCLE
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| Lateral Leg Muscle |
There are two muscle in lateral leg
A) Peroneus longus
B) Peroneus brevis
A) PERONEUS LONGUS
A) PERONEUS LONGUS
ORIGIN: Lateral tibial condyle, upper 2/3 of lateral surface of fibula, intermuscular septa.
INSERTION: Lateral side of base of first metatarsal, medial cuneiform.
NERVE SUPPLY: Superficial peroneal nerve (L5, S1).
ACTION: Everts and plantar flexes ankle.
B) PERONEUS BREVIS
B) PERONEUS BREVIS
ORIGIN: Lower 2/3 of lateral surface at fibula, intermuscular septa.
INSERTION: Lateral side of base of fifth metatarsal.
NERVE SUPPLY: Superficial peroneal nerve (L5, S1).
ACTION: Everts and plantar flexes ankle.
