MYOLOGY

POSTERIOR & LATERAL COMPARTMENT OF CALF

Presented By, MYTHILI.N

Posterior compartment of calf muscles

Superficial set muscles

Gastrocnemius

Soleus

Plantaris

POSTERIOR COMPARTMENT OF CALF

DEEP SET POPLITEUS

FLEXOR HALLUCIS LONGUS

FLEXOR DIGITORUM LONGUS

TIBIALIS POSTERIOR

Superficial set muscles

GASTROCNEMIUsIt Is Large Superficial Muscle & Lies Superficial To The Soleus. The Two Heads & Soleus Together To Form Triceps Surae

ORIGIN

Lateral head: Posterior Surface Of Lateral

Condyle Of Femur And Highest Of Three

Facets On Lateral Condyle.

medial head: Posterior Surface Of Femur

Above Medial Condyle

INSERTION

Tendo calcaneus to middle of three

facets on posterior aspect of calcaneus

GASTROCNEMIUsNERVE

Tibial nerve (S1, S2)

Action

Plantar flexes foot.

Flexes knee

SOLEUSIt Is A Sole Shaped Multipennate Muscle Lies

Deep To The Gastrocnemius

ORIGINSoleal line

Middle third of posterior border of tibia

Upper quarter of posterior shaft of fibula including neck

INSERTION

Tendo calcaneus to middle of three facets

on posterior surface of calcaneus

SOLEUS

NERVETibial nerve (S1,S2)

ACTION

Plantar flexes foot (aids venous return)

Anti graving muscle

Steadies leg on foot when standing

plantarisit vestigeal in human beings. It has a short belly & a long tendon

ORIGIN

Lateral supracondylar ridge of

femur above lateral head of

gastrocnemius and oblique popliteal

ligament of knee joint

INSERTION

Tendo calcaneus (medial side,

deep to gastrocnemius tendon)

PLANTARISNERVE

Tibial nerve (S1, 2)

ACTION

Plantar flexes foot and flexes

knee

Assist gastrocnemius in action

DEEP SET

MUSCLES

POPLITEUS

ORIGIN

Posterior shaft of tibia above soleal line and below tibial condyles

INSERTION

Middle of three facets on lateral surface of lateral condyle of femur.

Tendon passes into capsule of knee to posterior part of lateral meniscus

POPLITEUSNERVE Tibial nerve (L5,S1)

ACTION Unlocks extended knee by lateral rotation of

femur on tibia.

Pulls back lateral meniscus

FLEXOR HALLUCIS LONGUSORIGIN

Lower Two Thirds Of Posterior Fibula

Between Median Crest And Posterior

Border,

Lower Intermuscular Septum And

Aponeurosis Of Flexor Digitorum Longus

INSERTION

Base Of Distal Phalanx Of Big Toe

And Slips To Medial Two Tendons Of Flexor

Digitorum Longus

FLEXOR HALLUCIS LONGUS

NERVETibial Nerve

ACTION

Flexes Distal Phalanx Of Big Toe

Flexes Foot At Ankle,

Supports Medial Longitudinal Arch

FLEXOR DIGITORUM LONGUS

ORIGIN

Posterior Shaft Of Tibia Below Sole

Al Line And By Broad Aponeurosis

From Fibula

INSERTION

Base Of Distal Phalanges Of Lateral

Four Toes

FLEXOR DIGITORUM LONGUS

NERVE Tibial nerve (S1, S2)

ACTION

Flexes distal phalanges of lateral

four toes and foot at ankle.

Supports lateral longitudinal arch

TIBIALIS POSTERIOR

Origin

Upper Half Of Posterior Shaft Of Tibia

Upper Half Of Fibula Between

Medial Nerve Crest Interosseous

Border, And Interosseous Membrane

INSERTION

Tuberosity Of Navicular Bone And All

Tarsal Bones (Except Talus) And

Spring Ligament

TIBIALIS POSTERIOR

NERVE Tibial nerve (L4, L5)

ACTION

Plantar flexes and inverts foot

Supports medial longitudinal

arch of foot

MUSCLES OF LATERAL COMPARTMENT OF LEG

Peroneus longus

Peroneus brevis

Peroneus Longusit is superficial to peroneus brevis

Origin

Head Of Fibula, Upper 1/2 - 2/3 Of

Lateral Fibular Shaft Surface;

Also Anterior And Posterior

Intermuscular Septa Of Leg

Insertion

Plantar Posterolateral Aspect Of

Medial Cuneiform And Lateral

Side Of 1st Metatarsal Base

Peroneus LongusInnervation

Superficial Peroneal Nerve (L5, S1, S2); May

Also Receive Additional Innervation From Common Or

Deep Peroneal Nerves (L5, S1, S2)

Arterial Supply

Anterior Tibial And Peroneal Arteries

ActionEverts foot and plantar

flexes ankle; also helps to support the transverse arch of the foot

PERONEUS BREVISlies deep to peroneus longus

ORIGIN

Lower Two Thirds Lateral Shaft Of Fibula

Anterior & Posterior Inter Muscular

Septa

INSERTION

Tuberosity Of Base Of 5th Metatarsal

PERONEUS BREVIS

ACTION

Weak plantar flexor of foot

evertor of foot .

Supports lateral longitudinal

arch

NERVE

Superficial peroneal nerve (L5, S1)

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