![]() ![]() The remaining three muscles (tibialis posterior, flexor hallucis longus and flexor digitorum longus) act on the ankle and foot. One muscle, the popliteus, acts only on the knee joint. ![]() There are four muscles in the deep compartment of the posterior leg. Actions: Contributes to plantarflexion at the ankle joint and flexion at the knee joint.It blends with the calcaneal tendon and inserts onto the calcaneus. The fibres condense into a tendon which travels down the leg, between the gastrocnemius and soleus muscles. Attachments: Originates from the lateral supracondylar line of the femur.The plantaris is a small muscle which is absent in approximately 10% of the population. Actions: Plantarflexion of the foot at the ankle joint.The muscle converges with the fibres of the gastrocnemius to form the calcaneal tendon, which inserts onto the calcaneus. Attachments: Originates from the soleal line of the tibia and proximal fibula.It gets its name from its resemblance to a sole – a flat fish. The soleus is a flat muscle located underneath the gastrocnemius. Actions: Plantarflexion at the ankle joint and flexion at the knee joint.Distally, the muscle belly converges with the soleus muscle to form the calcaneal tendon.The two heads combine to form a single muscle belly.The medial head originates from the medial femoral condyle. The lateral head originates from the lateral femoral condyle.It has medial and lateral heads and forms the characteristic “calf” shape of the leg. The gastrocnemius is the most superficial of all the muscles in the posterior leg. Deep bursa of the calcaneal tendon – lies between the tendon and the calcaneus.Subcutaneous calcaneal bursa – lies between the skin and the calcaneal tendon.To minimise friction during movement, there are two bursae (fluid filled sacs) associated with the calcaneal tendon: They all insert onto the calcaneus (heel bone) of the foot, via the calcaneal tendon. For additional information visit Linking to and Using Content from MedlinePlus.There are three muscles within the superficial compartment of the posterior leg. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. It can also occur in the hand, foot, thigh, buttocks, and upper arm.Ī.D.A.M., Inc. There is usually no permanent injury to the limb.Ĭompartment syndrome is most common in the lower leg and forearm. ![]() However, the pain can limit activity and endurance. This condition is usually less limiting and does not lead to loss of function or limb. The pressure in a compartment only increases during that activity and goes down after the activity is stopped. ![]()
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