Learn Muscle Anatomy: Muscles of Plantarflexion
Have you ever watched a ballet dancer stand en pointe (also known as relevé) and wondered how it was even possible? That's basically my mindset whenever I see a ballet performance: "You are a human, not a swan. Stop being so graceful."
Ballet dancers undergo rigorous training to perform—not just learning choreography, but training their skeletons to bend and stretch in extreme poses. Relevé is an example of extreme plantarflexion, in which the foot bends down toward the sole.
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There are quite a few muscles involved in this action. Let's take a look at them.
Triceps Surae
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The triceps surae is a group of muscles in the posterior compartment of the distal leg, made up of the gastrocnemius, soleus, and their common tendon, the Achilles tendon; the triceps surae is commonly known as the calf.
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Origin |
Insertion |
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Gastrocnemius |
Posterior surfaces of the femoral condyles |
Posterior surface of the calcaneus by way of the Achilles tendon |
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Soleus |
Posterior surface of the head and upper third of the fibular shaft, and posterior tibia |
Posterior surface of the calcaneus by way of the Achilles tendon |
The tendon inserts onto the calcaneus, and during plantarflexion the tendon flexes, causing the bone to rise as the rest of the foot moves downward.
Flexor Muscles
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It seems a given that plantarflexion, being a flex action, would have flexor muscles acting in it. The flexor hallucis longus and flexor digitorum longus muscles, both part of the posterior compartment of the distal leg, work not only in plantarflexion but also to flex the phalanges of the foot.
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Origin |
Insertion |
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Flexor hallucis longus |
Posterior fibula and inferior interosseous membrane |
Inferior surface of distal phalanx 1 |
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Flexor digitorum longus |
Posterior surface of tibia |
Inferior surfaces of distal phalanges 2-5 |
Tibialis Posterior Muscle
The tibialis posterior acts in two muscle actions: plantarflexion and foot inversion. It is a deep muscle in the posterior compartment.
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Origin |
Insertion |
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Tibialis posterior |
Interosseous membrane, posterior surface of tibia, and medial surface of fibula |
Tuberosity on navicular and slips to cuneiforms (3), cuboid, and metatarsals 2-4 |
Plantaris Muscle
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I love the plantaris. It's so odd-looking—more of a whipcord than anything. It's a superficial muscle of the posterior compartment. Sometimes considered an accessory muscle, it consists of a small, thin muscle belly and a long, thin tendon.
The plantaris is an assist muscle, which means that it aids in providing steadiness in the act.
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Origin |
Insertion |
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Plantaris |
Supracondyle ridge of femur |
Posterior part of calcaneus (along with Achilles tendon) |
Plantarflexion Injuries
Imagine those ballet dancers for a second—do you think they learn how to relevé without some bumps and bruises along the way? Injuries associated with plantarflexion are very common. One of the most common injuries is ankle sprains, specifically straining the anterior talofibular ligament (ATF).
So, the next time you watch a ballet performance (or cringe your way through the movie Black Swan), think of all the muscles working together to lift those graceful dancers up onto their toes.
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Related Posts:
Additional Sources:
- Essential Ballet Foot Exercises (Russian Pointe)
- Richard Stockton College Athletics
