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The soleus is a powerful muscle in the back of the lower leg, or calf. It is a major muscle that enables humans to walk, run, jump, and keep balance. The soleus muscle is closely connected to the gastrocnemius muscle, with some anatomists considering them a single muscle, the triceps surae. The soleus muscle runs from just below the knee to the heel, inserting onto the posterior surface of the calcaneus, or heel bone, via the calcaneal tendon, also known as the Achilles tendon.
| Characteristics | Values |
|---|---|
| Location | Back part of the lower leg (the calf) |
| Composition | Complex, multi-pennate muscle |
| Origin | Superior end of the tibia and fibula bones of the lower leg |
| Insertion | Posterior surface of the calcaneus (heel bone) via the calcaneal tendon (Achilles tendon) |
| Function | Plantar flexion of the foot at the ankle joint, leg stability, and maintaining standing posture |
| Innervation | Tibial nerve (L4, L5, S1, S2) |
| Arterial Supply | Popliteal, fibular, and posterior tibial arteries |
| Veins | Popliteal vein |
| Blood Supply | Two main branches |
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What You'll Learn
The soleus muscle is one of three muscles that form the triceps surae
The soleus muscle is a powerful muscle that plays a crucial role in maintaining standing posture and balance. It runs from just below the knee to the heel and is closely connected to the gastrocnemius muscle. Some anatomists consider the combination of the soleus and gastrocnemius to be a single muscle, the triceps surae. The gastrocnemius is the more superficial of the two muscles, located closer to the skin, while the soleus lies deeper, just above the heel.
The soleus and gastrocnemius muscles come together and insert onto the posterior surface of the calcaneus (heel bone) via the calcaneal tendon, also known as the Achilles tendon. The calcaneal tendon is the strongest tendon in the human body and is easily visible and palpable at the heel. The triceps surae is innervated by the tibial nerve, specifically nerve roots L5-S2, and receives blood supply from two main branches.
The main function of the triceps surae is plantar flexion of the foot at the ankle joint, allowing the heel to elevate against gravity. This movement generates the propulsion force required for actions such as walking, running, jumping, and leaping. The soleus muscle is particularly effective for plantar flexion when the knee is bent due to its slow-twitch muscle fibres, which resist fatigue. Additionally, the soleus plays a role in maintaining stability when standing.
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It runs from just below the knee to the heel
The soleus muscle is a powerful muscle in the back of the lower leg, or calf. It runs from just below the knee to the heel and is involved in standing, walking, running, and jumping. It is closely connected to the gastrocnemius muscle, and some anatomists consider this combination to be a single muscle, the triceps surae. Its name is derived from the Latin word "solea", meaning "sandal".
The soleus is a complex, multi-pennate muscle in humans, normally having a separate (posterior) aponeurosis from the gastrocnemius muscle. Most soleus muscle fibres originate from each side of the anterior aponeurosis, attaching to the tibia and fibula. Other fibres originate from the posterior (back) surfaces of the head of the fibula and its upper quarter, as well as the middle third of the medial border of the tibia. The fibres originating from the anterior surface of the anterior aponeurosis insert onto the median septum, and the fibres from the posterior surface insert onto the posterior aponeurosis.
The posterior aponeurosis and median septum join in the lower quarter of the muscle and then join with the anterior aponeuroses of the gastrocnemius muscles to form the calcaneal tendon or Achilles tendon. This inserts onto the posterior surface of the calcaneus, or heel bone. The soleus muscle is one of the three muscles that form the triceps surae muscle, the other two being the medial and lateral heads of the gastrocnemius muscle.
The soleus muscle is the deepest muscle of the calf within the area known as the superficial posterior compartment. It is a broad, flat, multipennate type of skeletal muscle. The soleus has the greatest physiological cross-sectional area (CSA) of the calf muscles and is thought to provide up to 80% of triceps surae force. It is also a major postural muscle, helping to maintain an upright posture due to its important role as an antigravity muscle.
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The soleus is a powerful muscle in the back part of the lower leg
The soleus muscle is responsible for plantar flexion, which is the action of pointing the toes and lifting the heel. This movement is essential for walking, running, jumping, and maintaining balance. The soleus is particularly active during regular movement, such as walking, due to its slow-twitch muscle fibres, which resist fatigue. It also plays a crucial role in maintaining standing posture by providing a constant pull that prevents the body from falling forward.
The soleus muscle originates at the tibia and fibula bones of the lower leg. It inserts into the calcaneus of the heel via a tendon called the tendo calcaneus or Achilles tendon. The soleus muscle fibres converge with the fibres of the medial and lateral heads of the gastrocnemius muscle to form the calcaneal tendon, which attaches to the posterior surface of the calcaneus.
The soleus muscle is innervated by the tibial nerve and receives its blood supply from the popliteal, fibular, and posterior tibial arteries. It has a high physiological cross-sectional area, providing significant force to the triceps surae. The soleus is also involved in pumping venous blood back to the heart from the periphery, often referred to as the skeletal muscle pump.
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It is a major muscle of the calf
The soleus muscle is a major muscle of the calf. It is a powerful muscle in the back part of the lower leg, or calf, and is involved in standing, walking, running, jumping, and keeping balance. The soleus is closely connected to the gastrocnemius muscle, and some anatomists consider this combination to be a single muscle, the triceps surae. The soleus is the deepest muscle of the calf within the area known as the superficial posterior compartment.
The soleus muscle has its origin at the superior end of the tibia and fibula bones of the lower leg. It attaches at the Achilles tendon, also known as the tendo calcaneus, to insert into the calcaneus of the heel. The soleus muscle is responsible for plantar flexion, which is the action of flexing the ankle to point the toes. It is most engaged when the knee is bent and contributes to movements including walking, running, and jumping.
The soleus muscle is a complex, multi-pennate muscle in humans, having a separate (posterior) aponeurosis from the gastrocnemius muscle. Most soleus muscle fibres originate from each side of the anterior aponeurosis, attaching to the tibia and fibula. Other fibres originate from the posterior (back) surfaces of the head of the fibula and its upper quarter, as well as the middle third of the medial border of the tibia. The fibres from the anterior surface of the anterior aponeurosis insert onto the median septum, while the fibres from the posterior surface insert onto the posterior aponeurosis.
The soleus muscle is a postural muscle with a preponderance of slow-twitch muscle fibres. It helps to maintain an upright standing posture by providing a constant pull that prevents the body from falling forward. It also acts as a muscular pump to return blood to the heart.
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The muscle is innervated by the tibial nerve
The soleus muscle is a powerful muscle in the calf of the human leg. It is a complex, multi-pennate muscle that runs from just below the knee to the heel. The soleus is innervated by the tibial nerve. The tibial nerve carries the anterior rami of S1 and S2 spinal nerves into the posterior compartment of the leg. The tibial nerve is also responsible for innervating the tibialis posterior muscle, the flexor digitorum longus muscle, and the flexor hallucis longus muscle.
The soleus muscle is closely connected to the gastrocnemius muscle, and together they form the three-headed group of muscles referred to as the triceps surae. The soleus and gastrocnemius muscles both insert onto the posterior surface of the calcaneus (heel bone) via the calcaneal tendon, also known as the Achilles tendon. The contraction of the soleus muscle results in strong plantar flexion, which allows us to maintain an upright posture.
The soleus muscle has a high proportion of slow-twitch muscle fibres, making it well-suited for prolonged lower extremity activity and providing stability against gravity. It is most active when the knee is bent and is crucial for movements such as walking, running, jumping, and climbing. The soleus also acts as a muscular pump, helping to return blood to the heart from the periphery.
The soleus muscle originates at the tibia and fibula bones of the lower leg. It receives its blood supply from the peroneal artery proximally and the posterior tibial artery distally. The proximal part of the muscle is supplied by the popliteal, posterior tibial, and peroneal vascular pedicles, while the distal lateral belly receives blood from the peroneal pedicle and the distal medial belly from the posterior tibial pedicle.
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Frequently asked questions
The soleus muscle inserts at the posterior surface of the calcaneus (heel bone) via the calcaneal tendon, also known as the Achilles tendon.
The soleus muscle originates at the superior end of the tibia and fibula bones of the lower leg.
The soleus muscle is responsible for plantar flexion, which is the action of pointing the toes and lifting the heel. This movement is essential for walking, running, jumping, and maintaining balance.
The soleus muscle is one of the three muscles that make up the triceps surae, along with the gastrocnemius and plantaris muscles. It is a powerful muscle in the calf that helps to maintain an upright posture and prevent the body from falling forward.
