Logan Steele
Plantar flexion is a movement that occurs at the ankle joint, causing the inferior lowering of the mid- and forefoot while the tibia and fibula remain static, resulting in a downward bend at the ankle. This action requires the coordination of several muscles, including the gastrocnemius, plantaris, soleus, tibialis posterior, flexor digitorum longus, flexor hallucis longus, fibularis longus, and fibularis brevis. These muscles work together to enable activities such as standing on tiptoes, pressing the foot down on a pedal, or performing ballet en pointe. Strengthening the muscles that support plantar flexion can improve flexibility, protect the ankle, and prevent injuries.
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What You'll Learn
- The tibialis posterior is a deep muscle that supports the lower leg and assists with plantar flexion and inversion
- The plantaris is a long, thin muscle that works with the Achilles tendon to flex the ankle and knee
- The flexor hallucis longus is a deep muscle that helps with plantar flexion of the ankle and curling the toes
- The flexor digitorum longus is a deep muscle that attaches to every toe except the big toe, providing the power to flex them
- The peroneus brevis is a muscle that helps to keep the foot stable during plantar flexion
The tibialis posterior is a deep muscle that supports the lower leg and assists with plantar flexion and inversion
The tibialis posterior is a deep muscle located in the posterior aspect of the leg. It is the most central of all the leg muscles and is connected to the interosseous membrane, which attaches to the tibia and fibula. The muscle is also attached to the calf muscle and the bones on the inside of the foot.
The tibialis posterior is a key stabilising muscle of the lower leg. It helps with plantar flexion, which is the inferior lowering of the mid- and forefoot while the tibia and fibula remain static, causing a downward bend at the ankle joint. It also assists with inversion, which is when you turn the sole of the foot inward toward the other foot.
The tibialis posterior works with other muscles in the leg, such as the gastrocnemius, soleus, and plantaris, to support the lower leg and facilitate movement. These muscles are all involved in plantar flexion and help to elevate the heel when the foot is planted on the ground, which is important for walking, running, and fitness exercises.
Injuries to the tibialis posterior can result in a condition called posterior tibial tendonitis, which can cause pain, swelling, and potentially lead to a flat foot if left untreated. This condition is common among runners and active individuals and involves inflammation or tearing of the posterior tibial tendon. Therefore, it is important to strengthen the muscles in the ankle, leg, and foot that support plantar flexion to keep the foot flexible, protect the ankle, and prevent injuries.
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The plantaris is a long, thin muscle that works with the Achilles tendon to flex the ankle and knee
The human foot is a complex structure, and plantar flexion is one of the many movements it can perform. Plantar flexion is the inferior lowering of the mid- and forefoot while the tibia and fibula remain static, causing a downward bend at the ankle joint. Several muscles control plantar flexion, and one of them is the plantaris.
The plantaris is a long, thin muscle that runs along the back of the leg, from the end of the thigh bone down to the Achilles tendon. It is one of the plantar flexors in the posterior compartment of the leg, along with the gastrocnemius and soleus muscles. The plantaris tendon, which is the longest tendon in the human body, is approximately 30-45 centimetres long, while the plantaris muscle itself is only about 5-10 centimetres long. The plantaris is considered to have become less important to humans when our ancestors switched from climbing trees to bipedalism.
The plantaris muscle works in conjunction with the Achilles tendon to flex the ankle and knee. This allows us to stand on our tiptoes and point our feet. The plantaris starts just above the lateral head of the gastrocnemius muscle and runs beneath the gastrocnemius and soleus muscles, attaching to the medial side of the calcaneus (heel bone). The plantaris tendon inserts onto the posterior surface of the calcaneus, medial to the calcaneal tendon (also known as the Achilles tendon).
The plantaris muscle may also provide proprioceptive feedback information to the central nervous system regarding the foot's position. Its high density of proprioceptive receptor end organs supports this notion. Additionally, the plantaris muscle contains a large number of muscle spindles (proprioceptive receptors), so it has been theorised that it acts as a proprioceptive organ for the larger flexors of the ankle joint.
Injuries to the plantaris muscle, commonly called "tennis leg", are usually the result of a sudden muscular action such as reaching out for a tennis shot. Patients often report hearing a pop in the back of their calf, along with swelling and pain in the back of the lower leg. However, isolated plantaris muscle strains are rare, and ruptures normally occur in conjunction with injuries to other muscles in the posterior compartment of the lower leg.
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The flexor hallucis longus is a deep muscle that helps with plantar flexion of the ankle and curling the toes
The flexor hallucis longus is a powerful muscle located in the posterior compartment of the leg. It is one of the deep muscles in the lower leg, alongside the flexor digitorum longus and the tibialis posterior. The flexor hallucis longus is part of a group called the deep flexors of the calf.
The flexor hallucis longus helps with plantar flexion of the ankle and curling the toes. Plantar flexion is the inferior lowering of the mid- and forefoot while the tibia and fibula remain static, causing a downward bend at the ankle joint. The flexor hallucis longus also functions to flex the great toe and supinate the ankle. This muscle is also important for maintaining the medial longitudinal arch of the foot.
The flexor hallucis longus tendon passes downwards, deep to the flexor retinaculum, crossing the posterior ankle joint. It wraps around the lower end of the tibia, the back of the talus, and the inferior surface of the sustentaculum tali on the calcaneus. The tendon then enters the sole of the foot, passing forward between the two heads of the flexor hallucis brevis and inserting into the base of the distal phalanx of the great toe.
Injuries to the flexor hallucis longus tendon include tenosynovitis, tendinopathies, and muscle strains. Due to the small size of the flexor hallucis longus muscle, injuries associated with it and its tendon are often overlooked. Friction at the sustentaculum tali site can cause pain on the posteromedial aspect of the ankle, commonly referred to as "dancer's tendinitis." This injury is seen in ballet dancers, gymnasts, and runners due to excessive use of toe flexion.
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The flexor digitorum longus is a deep muscle that attaches to every toe except the big toe, providing the power to flex them
The flexor digitorum longus is a thin, deep muscle in the lower leg. It is part of the deep muscle group of the posterior compartment of the lower leg. It originates from the medial part of the posterior surface of the tibia, medial to the origin of the tibialis posterior muscle and inferior to the soleus muscle. The muscle fibres descend through the medial aspect of the posterior compartment of the leg.
The flexor digitorum longus provides the power to flex the second, third, fourth, and fifth toes. The muscle runs from the posterior surface of the tibia, across the posterior compartment of the leg to the phalanges of the foot. On its course, the muscle receives functional support from the quadratus plantae muscle. Due to its attachments, the flexor digitorum longus performs its action in four different joints: the talocrural (ankle joint), talocalcaneal (subtalar joint), metatarsophalangeal, and interphalangeal joints.
The flexor digitorum longus tendon passes through the tarsal tunnel and curves around a bony landmark called the sustentaculum tali. It then expands and is joined by the quadratus plantae muscle, and finally divides into four tendons, which are inserted into the bases of the last phalanges of the second, third, fourth, and fifth toes. The flexor digitorum longus is responsible for the movement and curling of the second, third, fourth, and fifth toes, allowing the toes to grip the surface of the floor. This is important for maintaining postural balance on rough or uneven surfaces.
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The peroneus brevis is a muscle that helps to keep the foot stable during plantar flexion
The peroneus brevis is a short muscle that lies in the lateral part of the lower leg. It is one of the three ankle everters, or fibularis muscles, along with the fibularis longus and fibularis tertius. The peroneus brevis is shorter than the fibularis longus, and it lies underneath it. The peroneus brevis originates from the lower two-thirds of the lateral surface of the fibula and inserts on the proximal fifth metatarsal. The tendon of the peroneus brevis passes downwards and loops posterior to the lateral malleolus, crossing the ankle and inserting on the styloid process of the proximal fifth metatarsal bone.
The peroneus brevis is also referred to as the fibularis brevis muscle and is located in the lateral compartment of the lower extremity below the knee. It is one of the muscles that make up the lateral compartment of the leg, along with its longer counterpart, the peroneus longus. The peroneus brevis receives innervation from the superficial peroneal nerve, and its arterial supply is by muscular branches of the peroneal artery.
The peroneus brevis assists with the eversion of the foot, which is tilting the sole away from the midline. It also helps with plantar flexion, which is the movement of the foot down towards the sole. Plantar flexion describes the inferior lowering of the mid- and forefoot while the tibia and fibula remain static, causing a downward bend at the ankle joint. Several muscles control plantar flexion, including the gastrocnemius, plantaris, soleus, tibialis posterior, flexor digitorum longus, flexor hallucis longus, fibularis longus, and fibularis brevis.
The peroneus brevis is important in keeping the foot stable during plantar flexion. An injury to the peroneus brevis or any of the other muscles that support plantar flexion can limit the ability to flex the foot or stand on tiptoes. Strengthening the muscles in the ankle, leg, and foot that support plantar flexion can help keep the foot flexible, protect the ankle, and prevent injuries. Wearing proper footwear, such as avoiding high heels, can also help to avoid injuries related to plantar flexion.
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Frequently asked questions
Plantar flexion is the extension of the ankle so that the foot points down and away from the leg. It involves several muscles and tendons in the leg and foot.
The main muscles involved in plantar flexion include the gastrocnemius, plantaris, soleus, tibialis posterior, flexor digitorum longus, flexor hallucis longus, fibularis longus, and fibularis brevis. The Achilles tendon is also vital to plantar flexion.
An injury to the muscles supporting plantar flexion can limit your ability to flex your foot or stand on tiptoes. It is important to strengthen the muscles in your ankle, leg, and foot to keep your foot flexible, protect your ankle, and prevent future injuries.
