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The gastrocnemius muscle is a superficial, two-headed muscle located in the back of the lower leg of humans. It is a powerful plantar flexor of the foot at the talocrural joint, and also flexes the leg at the knee. The gastrocnemius is fundamental for walking, running, jumping and posture. It is innervated by the tibial nerve, primarily from the first sacral (S1) nerve root, with some contribution from the fifth lumbar (L5) nerve root.
| Characteristics | Values |
|---|---|
| Location | Back part of the lower leg of humans |
| Compartment | Posterior |
| Joints | Knee, ankle and subtalar |
| Origin | Lateral condyle of the femur (lateral head); medial condyle of the femur (medial head) |
| Innervation | Tibial nerve, primarily from the first sacral (S1) nerve root, with some contribution from the fifth lumbar (L5) nerve root |
| Function | Lifts the heel upward and extends the foot downward (plantar flexion); flexes the leg at the knee |
| Activation | During fast, powerful leg movements (e.g. walking, running, jumping) |
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What You'll Learn
The gastrocnemius muscle is a superficial two-headed muscle
The muscle is named via Latin, from the Greek γαστήρ (gaster) 'belly' or 'stomach' and κνήμη (knḗmē) 'leg', meaning 'stomach of the leg' (referring to the bulging shape of the calf). The medial and lateral heads of the gastrocnemius are situated at the posterior, upper half of the lower leg and give the calf its definitive shape. The lateral head originates from the lateral condyle of the femur, while the medial head originates from the medial condyle of the femur.
The gastrocnemius functions by lifting the heel upward and extending the foot downward (plantar flexion), which is essential during walking, running, and jumping. It is mainly used during fast, powerful leg movements and is less utilised when standing stationary. Tennis leg is an injury that commonly occurs in tennis and squash players, presenting as a sudden, sharp pain at the back of the calf that usually follows rupture of the myotendinous junction of the medial head of the gastrocnemius.
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It is located in the back part of the lower leg
The gastrocnemius muscle is a powerful plantar flexor of the foot at the talocrural joint. It is a superficial two-headed muscle that is located in the back part of the lower leg of humans. It runs from its two heads just above the knee to the heel, extending across a total of three joints (knee, ankle and subtalar joints). The gastrocnemius is a very powerful muscle and is fundamental for walking and posture. It provides the force behind propulsion for walking, running and jumping.
The gastrocnemius is located with the soleus in the posterior compartment of the leg. It is considered a superficial muscle as it is located directly under the skin, and its shape may often be visualised through the skin. The muscle is named via Latin, from Greek γαστήρ (gaster) 'belly' or 'stomach' and κνήμη (knḗmē) 'leg', meaning 'stomach of the leg' (referring to the bulging shape of the calf).
The gastrocnemius functions by lifting the heel upward and extending the foot downward (i.e. plantar flexion), which is essential during walking, running, and jumping. While walking, the quadriceps muscle and the gastrocnemius activate, particularly during the first phase, where the foot lifts and swings forward, and the knee extends. At the knee joint, the gastrocnemius also functions in leg flexion.
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The muscle is innervated by the tibial nerve
The gastrocnemius muscle is a superficial two-headed muscle in the back part of the lower leg of humans. It is located superficial to the soleus in the posterior (back) compartment of the leg. It runs from its two heads just above the knee to the heel, extending across a total of three joints (knee, ankle and subtalar joints). The muscle is innervated by the tibial nerve, primarily from the first sacral (S1) nerve root, with some contribution from the fifth lumbar (L5) nerve root. The tibial nerve eventually separates from the sciatic nerve and innervates the gastrocnemius muscle. The small saphenous vein and accompanying sural nerve run along the superficial surface of the muscle, separated from it by the deep fascia. The common fibular nerve crosses the lateral head of the muscle, between it and biceps femoris. Deep to gastrocnemius are the soleus, popliteus and plantaris muscles, the popliteal vessels and the tibial nerve. The tibial nerve passes through the popliteal fossa and gives off branches to the gastrocnemius, popliteus, soleus, and plantaris muscles. The gastrocnemius is a powerful plantar flexor of the foot at the talocrural joint. It also flexes the leg at the knee. The actions of gastrocnemius are usually considered along with soleus, as the triceps surae group. They are the chief plantar flexors of the foot. The muscles are usually large and powerful.
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The gastrocnemius is a powerful plantar flexor of the foot
The gastrocnemius functions by lifting the heel upward and extending the foot downward, which is essential during walking, running and jumping. It provides the force behind propulsion for these movements. The gastrocnemius is also involved in leg flexion at the knee joint. It is mainly used during fast, powerful leg movements and is less utilised when standing stationary.
The gastrocnemius is considered a superficial muscle as it is located directly under the skin, and its shape may often be visualised through the skin. The medial and lateral heads of the gastrocnemius are situated at the posterior, upper half of the lower leg and give the calf its definitive shape.
Some anatomists consider the gastrocnemius and the soleus, which lies beneath it, to be a single muscle—the triceps surae or "three-headed [muscle] of the calf"—since they share a common insertion via the Achilles tendon.
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It is fundamental for walking and posture
The gastrocnemius muscle is a complex muscle that is fundamental for walking and posture. It is a superficial two-headed muscle that is located in the back part of the lower leg of humans. It runs from its two heads just above the knee to the heel, extending across a total of three joints (knee, ankle and subtalar joints). The gastrocnemius is a powerful plantar flexor of the foot at the talocrural joint, and it also flexes the leg at the knee. It provides the force behind propulsion for walking, running and jumping. The shape of the calf is a result of the medial and lateral heads of the gastrocnemius, which are situated at the posterior, upper half of the lower leg. The muscle is named via Latin, from Greek γαστήρ (gaster) 'belly' or 'stomach' and κνήμη (knḗmē) 'leg', meaning 'stomach of the leg' (referring to the bulging shape of the calf).
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Frequently asked questions
The gastrocnemius muscle is a superficial two-headed muscle located in the back part of the lower leg of humans.
The gastrocnemius muscle is fundamental for walking and posture. It is a powerful plantar flexor of the foot at the talocrural joint and also flexes the leg at the knee.
The name 'gastrocnemius' comes from the Latin, from the Greek γαστήρ (gaster) 'belly' or 'stomach' and κνήμη (knḗmē) 'leg', meaning 'stomach of the leg', referring to the bulging shape of the calf.
The gastrocnemius muscle provides the force behind propulsion for walking, running and jumping.
The gastrocnemius muscle is a complex muscle with two heads that runs from the back of the knee to the heel.
