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The soleus muscle is a powerful muscle in the calf of the human leg. It is one of the three muscles that make up the calf, along with the gastrocnemius and plantaris muscles. The soleus is a wide, flat muscle that runs from just below the knee to the heel. It is involved in various basic activities, such as walking, running, and jumping, and plays a crucial role in maintaining posture and balance. The name soleus is derived from the Latin word solea, meaning sandal.
| Characteristics | Values |
|---|---|
| Location | Back part of the lower leg (the calf) |
| Superficial posterior compartment of the leg | |
| Deep to the gastrocnemius muscle | |
| Runs from just below the knee to the heel | |
| Behind the shin bone (tibia) | |
| Connected to the fibula and tibia | |
| Type | Wide, flat muscle |
| Function | Involved in standing, walking, running, jumping, and maintaining posture |
| Responsible for plantar flexion, especially with a bent knee | |
| Helps pump blood from the lower leg back to the heart | |
| Blood Supply | Peroneal artery, posterior tibial artery, popliteal, posterior tibial and peroneal vascular pedicles |
| Innervation | Anterior rami of S1 and S2 spinal nerves, carried by the tibial nerve |
| Injuries | Less common than gastrocnemius injuries |
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What You'll Learn
The soleus muscle is a powerful muscle in the calf
The soleus muscle is closely connected to the gastrocnemius muscle, and these two muscles come together above the heel to form the Achilles tendon. The gastrocnemius is just under the skin at the back of the lower leg, while the soleus sits slightly deeper. Together, the soleus and gastrocnemius muscles help the body to walk, run, jump, and stand on tiptoes. They also enable the foot and lower leg to move, propelling the body forward when walking or running.
The soleus is the most effective muscle for plantar flexion in a bent knee position. Plantar flexion is the action of increasing the angle between the foot and the leg. The soleus is the primary muscle used for plantar flexion during regular movement due to its slow-twitch fibres, which resist fatigue. The contraction of the soleus results in strong plantar flexion, which is essential for maintaining an upright posture. This is because the body's centre of gravity is anterior to the ankle joint, so the body naturally leans forward. The soleus counteracts this by producing a continuous state of plantar flexion, pulling the body back and preventing it from falling forward.
The soleus is also important in pumping venous blood back into the heart from the periphery. It is often called the skeletal muscle pump, peripheral heart, or sural (tricipital) pump. The soleus has more slow muscle fibres than many other muscles, with human soleus fibres ranging from 60% to 100% slow fibres.
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It runs from 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, attaching to the Achilles tendon, or calcaneal tendon, at the back of the heel bone, or calcaneus. The soleus is one of the three muscles that make up the calf muscle, or triceps surae, along with the gastrocnemius and plantaris muscles. The gastrocnemius is the larger and more superficial of the two, with the soleus sitting just beneath it.
The soleus is a wide, flat muscle that is involved in various weight-bearing activities, including walking, running, and jumping. It is particularly important for maintaining balance and posture. When standing, the body has a natural tendency to lean forward, but this is counteracted by the soleus, which produces a continuous state of plantar flexion, or downward pointing of the foot and toes. This is due to the high number of slow-twitch muscle fibres in the soleus, which make it fatigue-resistant.
The soleus and gastrocnemius muscles work together to accomplish plantar flexion. The gastrocnemius is more involved in locomotion and contributes to the flexion of the knee, as it crosses both the knee and ankle joints. In contrast, the soleus is a single-joint muscle, crossing only the ankle. When the knee is bent, the gastrocnemius is limited in its ability to contract, making the soleus the primary muscle responsible for plantar flexion.
The soleus is also important for pumping venous blood back to the heart from the lower leg. When the soleus contracts, it acts like a sponge, pushing blood through the veins. This action is often referred to as the skeletal muscle pump.
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It is involved in standing and walking
The soleus is a powerful muscle in the calf at the back of the lower leg. It is closely connected to the gastrocnemius muscle, with which it forms the calf muscle or triceps surae. The soleus is wider and flatter than the gastrocnemius and sits deeper than it.
The soleus plays an important role in maintaining standing posture. The body's centre of gravity is anterior to the ankle joint, so the body has a natural tendency to lean forward. This is counteracted by a continuous state of plantar flexion, which is produced mainly by the soleus when standing. The soleus consists mostly of type 1 slow, fatigue-resistant fibres. If not for its constant pull, the body would fall forward.
The soleus is also involved in walking. During regular movement, the soleus is the primary muscle utilised for plantar flexion due to its slow-twitch fibres resisting fatigue. The contraction of the soleus results in strong plantar flexion, enabling the lifting of the heel against gravity when walking or jumping.
The soleus is also involved in running and jumping. It helps the legs support the body to maintain good posture.
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It is closely connected to the gastrocnemius muscle
The soleus muscle is closely connected to the gastrocnemius muscle. The gastrocnemius is a large, superficial two-headed muscle located in the back part of the lower leg in humans. It forms the bulk of the calf muscle. The soleus muscle is a wide, flat leg muscle found on the posterior leg. It runs from just below the knee to the heel and is located deep to the gastrocnemius.
The two muscles are often considered to form a single muscle, the triceps surae, or the "three-headed muscle of the calf". This is because they share a common insertion via the Achilles tendon, also known as the calcaneal tendon, onto the posterior surface of the calcaneus (heel bone). The plantaris muscle and a portion of its tendon run between the two muscles.
The gastrocnemius and soleus muscles work together to enable basic activities such as walking, running, and leaping. They also help to support the body in maintaining an upright posture. The gastrocnemius is more involved in locomotion and contributes to the flexion of the knee, while the soleus is the primary muscle responsible for plantar flexion, particularly when the knee is bent.
The soleus muscle is involved in standing and walking. It is a powerful muscle that helps to keep the body balanced. The soleus has more slow-twitch muscle fibres than the gastrocnemius, which has more fast-twitch fibres. This makes the soleus more resistant to fatigue and the primary active muscle when standing still.
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It is an antigravity muscle
The soleus muscle is a powerful muscle in the calf of the posterior leg. It runs from just below the knee to the heel. It is one of the three muscles that make up the calf muscle, the others being the gastrocnemius and the plantaris. The soleus is a wide, flat muscle that sits deeper in the leg than the gastrocnemius.
The soleus is an antigravity muscle. Antigravity muscles are those that are activated mainly to counteract the force of gravity and maintain an upright posture. They are essential for maintaining balance and coordination during exercise, movement and locomotion. The soleus, in particular, is responsible for pumping venous blood back into the heart from the periphery and is often called the skeletal muscle pump, peripheral heart or the sural (tricipital) pump.
The soleus is the most effective muscle for plantar flexion in a bent-knee position. Its contraction results in strong plantar flexion, which allows us to maintain an upright posture. The soleus is innervated by the tibial nerve and has a high proportion of slow-twitch muscle fibres, which resist fatigue.
The soleus muscle is closely connected to the gastrocnemius muscle, and some anatomists consider this combination to be a single muscle, the triceps surae. The two muscles work together to form the three-headed group of muscles referred to as the triceps surae. They both insert on the calcaneus via the calcaneal tendon (also known as the Achilles tendon), acting in many basic activities such as walking, running and leaping.
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Frequently asked questions
The soleus muscle is located in the posterior compartment of the leg, running from just below the knee to the heel.
The soleus muscle has two functions. Firstly, it generates power to aid movement, working with other muscles in the lower leg to assist in walking, standing, and running. Secondly, it works as a muscular pump to help pump blood from the lower leg back to the heart.
The soleus muscle is an antigravity muscle, which helps to maintain an upright posture in humans. It works to counteract the body's natural tendency to lean forward due to its centre of gravity being anterior to the ankle joint.
The soleus muscle runs along the back of the lower leg, located just beneath the gastrocnemius muscle. These two muscles are closely connected and, together with the plantaris muscle, form the group of superficial posterior compartment calf muscles.
The soleus muscle and the gastrocnemius muscle join together at the Achilles tendon, inserting onto the posterior surface of the calcaneus (heel bone).
