Posterior compartment of leg
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Posterior compartment of leg | |
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Details | |
Latin | compartimentum cruris posterius |
posterior tibial artery | |
tibial nerve | |
Identifiers | |
TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
TH | {{#property:P1694}} |
TE | {{#property:P1693}} |
FMA | {{#property:P1402}} |
Anatomical terminology
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The posterior compartment of the leg is one of the fascial compartments of the leg and is divided further into deep and superficial compartments.
Contents
Structure
Muscles
Deep posterior compartment
Muscle | Origin | Insertion | Innervation | Main Action |
---|---|---|---|---|
Flexor hallucis longus | Inferior two-thirds of posterior surface of fibula; inferior part of interosseous membrane | Base of distal phalanx of big toe (hallux) | Tibial nerve (S1, S2) |
Flexes big toe at all joints; weakly plantarflexes ankle; supports medial longitudinal arch of foot |
Flexor digitorum longus | Medial part of posterior surface of tibia; by a broad tendon to fibula | Bases of distal phalanges of lateral four digits | Flexes lateral four digits; plantarflexes ankle; supports longitudinal arches of foot | |
Tibialis posterior | Interosseous membrane; posterior surface of tibia inferior to soleal line; posterior surface of fibula | Tuberosity of navicular, cuneiform, cuboid, and sustentaculum tali of calcaneus; bases of 2nd, 3rd, and 4th metatarsals |
(L4, L5) |
Plantarflexes ankle; inverts foot |
Popliteus | Lateral surface of lateral condyle of femur and lateral meniscus | Posterior surface of tibia, superior to soleal line |
(L4, L5, S1) |
Weakly flexes knee and unlocks it by rotating femur 5 deg on fixed tibia; medially rotates tibia of unplanted limb |
Superficial posterior compartment
Muscle | Origin | Insertion | Innervation | Main Action |
---|---|---|---|---|
Gastrocnemius | Lateral head: lateral aspect of lateral condyle of femur Medial head: popliteal surface of femur; superior to medial condyle |
Posterior surface of calcaneus via calcaneal tendon | Tibial nerve (S1, S2) |
Plantarflexes ankle when knee is extended; raises heel during walking; flexes leg at knee joint |
Soleus | Posterior aspect of head and superior quarter of posterior surface of fibula; soleal line and middle third of medial border of tibia; and tendinous arch extending between the bony attachments | Plantarflexes ankle independent of position of knee; steadies leg on foot | ||
Plantaris | Inferior end of lateral supracondylar line of femur; oblique popliteal ligament | Weakly assists gastrocnemius in plantarflexing ankle |
Blood supply
Innervation
The posterior compartment of the leg is supplied by the tibial nerve.
Function
- It contains the plantar flexors:[4]
References
- ↑ Moore, Dally, and Agur (2014). Moore Clinically-Oriented Anatomy, Table 5.13.II, p 598.
- ↑ https://www.msu.edu/user/vosskurt/Miscellaneous%20pages/musloc.htm
- ↑ Moore, Dally and Agur (2014). Moore Clinically-Oriented Anatomy, Table 5.13.I, p 597.
- ↑ postleg at The Anatomy Lesson by Wesley Norman (Georgetown University)
External links
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