This document summarizes the muscles of the posterior and lateral compartments of the calf. It describes the origin, insertion, innervation, blood supply, and actions of the superficial muscles - gastrocnemius, soleus, and plantaris. It also summarizes the deeper muscles - popliteus, flexor hallucis longus, flexor digitorum longus, tibialis posterior, peroneus longus, and peroneus brevis. For each muscle, it provides the anatomical details needed to understand its structure and function.

1. POSTERIOR & LATERAL COMPARTMENT
OF CALF
Presented By,

2. Posterior compartment of calf
muscles
Superficial set muscles
Gastrocnemius
Soleus
Plantaris

3. POPLITEUS
FLEXOR HALLUCIS LONGUS
FLEXOR DIGITORUM LONGUS
TIBIALIS POSTERIOR

5. GASTROCNEMIUs
It Is Large Superficial Muscle& Lies Superficial ToThe Soleus.
The Two Heads & SoleusTogether 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

6. GASTROCNEMIUs
NERVE
Tibial nerve (S1, S2)
Action
Plantar flexes foot.
Flexes knee

7. SOLEUS
It Is A Sole Shaped Multipennate Muscle Lies Deep
To The Gastrocnemius
ORIGIN
Soleal 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

8. SOLEUS
NERVE
Tibial nerve (S1,S2)
ACTION
Plantar flexes foot (aids venous return)
Anti graving muscle
Steadies leg on foot when standing

9. plantaris
it 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)

10. PLANTARIS
NERVE
Tibial nerve (S1, 2)
ACTION
Plantar flexes foot and flexes knee
Assist gastrocnemius in action

12. 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

13. POPLITEUS
NERVE
Tibial nerve (L5,S1)
ACTION
Unlocks extended knee by lateral rotation of
femur on tibia.
Pulls back lateral meniscus

14. FLEXOR HALLUCIS LONGUS
Lower Two Thirds Of Posterior Fibula
Between Median Crest And Posterior Border,
Lower Intermuscular Septum And
Aponeurosis Of Flexor Digitorum Longus
Base Of Distal Phalanx Of Big Toe And
Slips To Medial Two Tendons Of Flexor
Digitorum Longus

15. FLEXORHALLUCIS LONGUS
NERVE
Tibial Nerve
ACTION
Flexes Distal Phalanx Of Big Toe
Flexes Foot At Ankle,
Supports Medial Longitudinal Arch

16. FLEXOR DIGITORUM LONGUS
Posterior Shaft Of Tibia Below Sole
Al Line And By Broad Aponeurosis From
Fibula
Base Of Distal Phalanges Of Lateral Four
Toes

17. FLEXORDIGITORUMLONGUS
NERVE
Tibial nerve (S1, S2)
ACTION
Flexes distal phalanges of lateral four toes
and foot at ankle.
Supports lateral longitudinal arch

18. 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

19. NERVE
Tibial nerve (L4, L5)
ACTION
Plantar flexes and inverts foot
Supports medial longitudinal arch of foot

20.  Peroneus longus
 Peroneus brevis

21. Peroneus Longus
it 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

22. Innervation
Superficial Peroneal Nerve (L5, S1, S2); May Also
Receive Additional Innervation From Common Or Deep Peroneal
Nerves (L5, S1, S2)
ArterialSupply
Anterior Tibial And Peroneal Arteries
Action
Everts foot and plantar flexes ankle;
also helps to support the transverse arch of
the foot

23. PERONEUS BREVIS
lies deep to peroneus longus
ORIGIN
Lower Two Thirds Lateral Shaft Of Fibula
Anterior & Posterior Inter Muscular Septa
INSERTION
Tuberosity Of Base Of 5th Metatarsal

24. ACTION
Weak plantar flexor of foot
evertor of foot .
Supports lateral longitudinal arch
NERVE
Superficial peroneal nerve (L5, S1)