Logan Steele
Plantar flexion is a term that describes the extension of the ankle so that the foot points down and away from the leg. This movement requires a coordinated effort between several muscles in the ankle, foot, and leg. These muscles include the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, flexor digitorum brevis, quadratus plantae, flexor hallucis brevis, flexor digiti minimi brevis, tibialis anterior, tibialis posterior, peroneus longus, and peroneus brevis. Strengthening these muscles can help improve plantar flexion, enhance stability, and prevent injuries.
| Characteristics | Values |
|---|---|
| Definition | Extension of the ankle so that the foot points down and away from the leg |
| Range of motion | 20-50 degrees from the resting position; less flexible individuals may experience 10 degrees of flexion, while incredibly flexible individuals may experience up to 55 degrees of flexion |
| Muscles involved | Gastrocnemius, Soleus, Plantaris, Flexor hallucis longus, Flexor digitorum longus, Triceps surae, Tibialis anterior, Tibialis posterior, Peroneus longus, Peroneus brevis, Quadratus plantae, Flexor hallucis brevis, Flexor digiti minimi brevis, Peroneus |
| Injuries | Ankle sprains, fractures, or strains; injuries can lead to gait disturbances and difficulty standing on toes or pushing down on pedals |
| Prevention and treatment | Strengthening exercises, wearing proper footwear, and seeking advice from a podiatrist or orthopedic surgeon |
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What You'll Learn
Gastrocnemius, soleus, and plantaris muscles
The gastrocnemius, soleus, and plantaris muscles are all involved in plantar flexion. The gastrocnemius is a muscle that forms half of the calf muscle. It starts at the back of the knee and attaches to the Achilles tendon at the heel. The soleus is the other main component of the calf muscle. It also connects to the Achilles tendon. The plantaris is a small muscle that runs between the gastrocnemius and soleus down the length of the lower leg. Not everyone has a plantaris muscle—about 10% of people only have the two larger muscles.
The gastrocnemius is one of the muscles that does most of the work in plantar flexion. It is a broad and strong muscle. The soleus is also vital for any movement involving plantar flexion. It is responsible for pushing the foot away from the ground. The plantaris muscle works in conjunction with the Achilles tendon to flex the ankle and knee. It is used every time a person stands on their tiptoes.
The calf muscle, which consists of the gastrocnemius and soleus, helps humans walk, run, jump, stand on their toes, and flex their foot. The gastrocnemius and soleus also work together to support the body when standing and enable movement of the foot and lower leg. They propel the body forward when walking or running. The calf muscle also allows humans to rotate their ankle, flex their foot, and "lock" their knee.
The gastrocnemius and soleus muscles are skeletal muscles, which are made up of many individual fibres that bundle together to create a striped appearance. The gastrocnemius is stronger than the soleus, which is faster but less powerful. The gastrocnemius and soleus muscles can be stretched by performing certain exercises. For example, to stretch the gastrocnemius, the knee of the back leg must be kept extended.
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Fibularis longus and fibularis brevis
Plantar flexion is the extension of the ankle so that the foot points down and away from the leg. It involves a coordinated effort between several muscles in the ankle, foot, and leg. The fibularis longus and fibularis brevis are two of the muscles that contribute to plantar flexion.
The fibularis longus (FL) and fibularis brevis (FB) are two of the three peroneus muscles, with the former being the most superficial of the three. The FL is larger in volume than the FB, but clinical observations of tendon rupture suggest that the FB may be the stronger and more important evertor. The strength of a muscle is not based purely on its volume, and the discrepancy between the two muscles may be due to differences in muscle architecture.
The fibularis brevis is a short muscle that, together with the fibularis longus, comprises the group of lateral leg muscles. The fibularis brevis originates from the distal two-thirds of the lateral surface of the fibula and the adjacent part of the anterior intermuscular septum. At the level of the distal third of the leg, it gives off a broad, flat tendon that passes behind the lateral malleolus to enter the lateral part of the foot. The tendon finally inserts on the tuberosity of the fifth metatarsal bone. The fibularis brevis is supplied by the superior and inferior branches of the anterior tibial artery and is motoric innervated by the superficial fibular nerve.
The fibularis longus, on the other hand, starts at the upper section of the fibula and runs down most of the fibula bone. Its tendon courses deep to the tendon of the fibularis brevis proximally and anterior to the same structure in its distal aspect. The tendon of the fibularis longus then continues caudally to pass behind the lateral malleolus, inserting on the medial cuneiform and first metatarsal.
In summary, the fibularis longus and fibularis brevis are two muscles that contribute to plantar flexion. They belong to the group of lateral leg muscles and work together to plantarflex and evert the foot. The fibularis brevis originates from the fibula and inserts on the fifth metatarsal bone, while the fibularis longus starts at the upper section of the fibula and inserts on the medial cuneiform and first metatarsal.
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Flexor hallucis longus and flexor digitorum longus
The flexor hallucis longus and flexor digitorum longus are deep muscles in the lower leg. They are essential yet often underrated in discussions of leg and foot function. These muscles are crucial for the intricate movements of the foot and ankle, such as balance, gait, and activities requiring foot dexterity.
The flexor hallucis longus is a powerful muscle that comprises the deep layer of the posterior compartment of the leg. It is also known as an unipennate muscle, which means its muscle fibres converge to attach on one side of the tendon. This muscle originates from the distal two-thirds of the posterior surface of the fibula and descends on the fibular side of the leg. It then crosses over the posterior part of the ankle and enters the foot through the tarsal tunnel, a narrow space found on the medial side of the ankle. The flexor hallucis longus tendon is the most lateral structure in the tarsal tunnel, and it is important for preventing injuries to the adjacent tibial nerve and other neurovascular structures. As it exits the tarsal tunnel, it is crossed by the flexor digitorum longus tendon, which curves obliquely over it. The flexor hallucis longus then continues anteriorly, passing through the fibrous digital sheath of the great toe before inserting onto the plantar surface of the base of the distal phalanx. Its primary function is the flexion of the big toe, which is essential for walking and maintaining balance while standing on the tiptoes.
The flexor digitorum longus is another deep muscle in the lower leg, which starts out thin and gradually widens as it moves down the leg. It is one of the flexor hallucis longus' antagonistic muscles. It also plays a role in plantar flexion and foot inversion. The primary action of the flexor digitorum longus is the flexion of the smaller toes, or curling the toes, which is important for the swing phase of gait.
The tendons of these two muscles, the flexor hallucis longus and flexor digitorum longus, are routinely used in reconstructive foot and ankle surgery. They cross in the chiasma plantare and show variable interconnections, which can complicate tendon harvesting.
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Peroneus longus and peroneus brevis
The peroneus longus and peroneus brevis muscles are two of the three peroneus muscles that travel distally along the fibula. The peroneus brevis is a short muscle that lies in the lateral part of the lower leg, deep to the peroneus longus. It is one of the three ankle everters, known as the fibularis muscles, and is responsible for 63% of the power needed to evert the foot. It also assists in plantar flexion. The peroneus longus, on the other hand, starts at the upper section of the fibula and runs down most of the fibula bone, attaching to the medial cuneiform and first metatarsal. These two muscles work together to help keep the foot stable and balanced during plantar flexion.
The peroneus brevis originates from the lower two-thirds of the lateral fibula and inserts on the proximal fifth metatarsal. It is relevant in occupational medicine due to its frequent involvement in lateral ankle sprains. Its tendon is the most commonly dislocated tendon in the ankle, along with the tendon of the peroneus longus. 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.
The peroneus longus, also known as the fibularis longus, is the most superficial of the peroneus muscles. It plays a crucial role in supporting the weight-bearing arches of the foot, along with the tibialis posterior. This muscle helps to steady the leg on the foot in a single-leg stance by drawing on the lateral leg and preventing medial collapse. The peroneus longus tendon turns at the retromalleolar region and in the cuboid tunnel, where it is secured by the superior peroneal retinaculum.
Injuries to the peroneus longus and peroneus brevis muscles can affect plantar flexion and limit the range of motion of the foot. Peroneal tendon injuries are common in young, active individuals and those who participate in sports such as football, soccer, and running. The peroneus brevis is particularly susceptible to tendon injuries, with the tendon rubbing on the fibula, leading to inflammation and possible dislocation or tendon tears. A physical exam can be performed to assess the range of motion and motor strength of the ankle, and in some cases, surgical treatment may be required for peroneal tendon tears.
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Tibialis anterior
The tibialis anterior is a fusiform muscle found in the anterior part of the leg. It is thick and fleshy above, and tendinous below, with fibres that run vertically downward. It is the most medial muscle in the anterior compartment of the leg.
The tibialis anterior muscle arises from the upper two-thirds of the lateral surface of the tibia and the adjoining part of the interosseous membrane and deep fascia overlying it. It is inserted into the medial and inferior surface of the medial cuneiform bone, and the adjacent portion of the first metatarsal bone. The muscle is innervated by the deep fibular nerve, and recurrent genicular nerve (L4).
The tibialis anterior is the primary dorsiflexor of the ankle, and it also inverses the foot at the subtalar joint. It is one of the muscles that tend to be inhibited and underactive, which can lead to abnormality in the anticipatory postural adjustment (APA) phase during gait initiation of the affected limb. It is also one of the four dorsiflexor muscles of the foot, and its action is considerably stronger than the other three.
The tibialis anterior helps to maintain the medial longitudinal arch of the foot. It draws up and holds the toe in a locked position. It aids in any activity that requires moving the leg or keeping the leg vertical. It stabilises the ankle as the foot hits the ground during the contact phase of walking (eccentric contraction) and acts later to pull the foot clear of the ground during the swing phase (concentric contraction).
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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 a coordinated effort between several muscles in the ankle, foot, and leg.
The muscles involved in plantar flexion include the gastrocnemius, soleus, plantaris, flexor hallucis longus, flexor digitorum longus, flexor digitorum brevis, quadratus plantae, flexor hallucis brevis, flexor digiti minimi brevis, tibialis anterior, and the Achilles tendon.
An injury to any of the muscles involved in plantar flexion can limit your range of motion and affect your ability to perform activities that require plantar flexion, such as standing on your tiptoes or pushing down on pedals.
You can strengthen the muscles involved in plantar flexion through exercises such as calf raises and picking up marbles with your toes. Wearing proper footwear and avoiding high heels can also help prevent injuries and improve your plantar flexion.
