Maximus Gage
The human body is a fascinating machine, with many muscles working in tandem to produce movement. One such movement is plantar flexion, which is the motion of pointing the foot downwards. This movement is made possible by several muscles in the foot and leg, including the flexor hallucis longus, flexor digitorum longus, and tibialis posterior. These muscles work with the Achilles tendon to flex the foot and toes, allowing us to stand on our toes, walk, and maintain balance. This article will explore these muscles in more detail, including their attachments, functions, and how injuries can affect their performance.
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What You'll Learn
Flexor digitorum longus flexes all toes except the big toe
The flexor digitorum longus muscle is responsible for flexing and curling the second, third, fourth, and fifth toes—all the toes except the big toe. This muscle is situated on the tibial side of the leg, and it arises from the posterior surface of the tibia. At its origin, it is thin and pointed, but it gradually increases in size as it moves down the leg.
The flexor digitorum longus is one of the muscles that control plantar flexion, which is the movement of the foot that allows you to flex your toes, stand on tiptoes, or point your toes. An injury to this muscle can limit your ability to perform these movements. For example, flexor digitorum longus pain can occur after tripping and falling on an uneven surface, causing pain in the feet and ankles and making it difficult to walk.
The flexor digitorum longus works together with other muscles to flex and curl the lateral four toes. These include the flexor hallucis longus, which is responsible for flexing the big toe, and the tibialis posterior, which is involved in plantar flexion and inversion, or turning the sole of the foot inward. The flexor digitorum brevis is another muscle that flexes the toes, causing them to curl under when contracted.
The flexor digitorum longus tendon passes through the tarsal tunnel and curves around a bony landmark called the sustentaculum tali. It receives a strong tendinous slip from the knot of Henry, where it crosses over the tendon of the flexor hallucis longus. The flexor digitorum longus then expands and joins the quadratus plantæ muscle before dividing into four tendons, which are inserted into the bases of the last phalanges of the second to fifth toes.
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Flexor hallucis longus flexes the big toe
The flexor hallucis longus is a posterior leg muscle that is involved in moving the big toe and foot. It is one of the three deep muscles of the posterior compartment of the leg, the others being the flexor digitorum longus and the tibialis posterior. The tibialis posterior is the most powerful of these deep muscles.
The flexor hallucis longus arises from the posterior two-thirds of the fibula and descends on the fibular side of the leg. It then crosses over the posterior part of the ankle to emerge on the sole of the foot, where it passes anteriorly to insert on the big toe (hallux). The primary action of the flexor hallucis longus is to flex the big toe, but it also has additional functions such as plantar flexion and foot inversion. This muscle is also important for maintaining the medial longitudinal arch.
The flexor hallucis longus flexes all the joints of the big toe as the foot is raised from the ground. Additionally, it stabilizes the first metatarsal head and keeps the distal pad of the big toe in contact with the ground in toe-off and when on tip-toes. It produces the final thrust from the foot in the toe-off phase of the gait cycle.
A common exercise for foot strength involves using a towel. The patient is asked to sit and place a towel under their foot, then grip the towel with their big toe, thereby moving the towel along the floor. This can also be done through a larger range using a theraband around the big toe. The muscle can be strengthened by utilizing its role in balance. Providing a patient with a suitably challenging balance exercise, such as using a wobble board, will make the exercise more functional.
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Tibialis posterior is involved in plantar flexion and inversion
Several muscles control plantar flexion, which is the movement of flexing the foot. One of these muscles is the tibialis posterior, which is involved in both plantar flexion and inversion.
The tibialis posterior is a small muscle located deep in the lower leg, specifically in the posterior compartment of the leg. It is the most central muscle in the posterior compartment of the leg and is hidden from view by the larger, superficial muscles of the leg, such as the gastrocnemius and soleus. The tibialis posterior is attached between the bones of the leg and the foot, and it crosses the ankle joint to insert into the plantar surface of the foot.
The function of the tibialis posterior is to assist in plantar flexion and inversion of the foot. Plantar flexion is the movement of flexing the foot, while inversion refers to turning the sole of the foot inward towards the other foot. The tibialis posterior helps elevate the heel during plantar flexion, which is important for walking, running, and fitness exercises such as calf raises. It also works with the peroneus longus muscle to stabilise the ankle when standing on tiptoes.
Tibialis posterior dysfunction can lead to issues such as flat feet and weak arch control in adults. This is due to its role in supporting the medial arch of the foot. An injury to the tibialis posterior can limit the ability to flex the foot or stand on tiptoes. Therefore, it is important to strengthen this muscle to prevent injuries and maintain its stabilising function.
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Peroneus longus works with tibialis posterior to stabilise the ankle
Several muscles are responsible for flexing the toes. The flexor digitorum longus muscle, for example, is situated on the tibial side of the leg and flexes the second, third, fourth, and fifth toes. The flexor digitorum longus muscle arises from the posterior surface of the tibia and fascia covering the tibialis posterior muscle. This muscle makes it possible for the toes to grip the floor, which helps to maintain postural balance on uneven surfaces.
Another muscle that flexes the toes is the flexor hallucis longus, which is a deep muscle that runs down the lower leg to the big toe. It helps to flex the big toe, enabling us to walk and stand on tiptoes. The flexor digitorum brevis also plays a role in toe flexion, causing the toes to curl under when contracted. The abductor hallucis pulls the big toe away from the other toes, while the abductor digiti minimi acts on the little toe, pulling it away from the midline.
The peroneus longus, also known as the fibularis longus, is a major mover and stabiliser of the foot and ankle. It runs down the lateral side of the lower leg and attaches to the foot, turning into a tendon at the bottom of the foot. This muscle works together with the tibialis posterior to stabilise the ankle, particularly when standing on tiptoe. The peroneus longus is involved in plantar flexion and eversion, which is the outward turning of the sole of the foot. It also helps the calf muscle in pointing the toes down. The nerve supply to the peroneus longus comes from the lumbar and sacral regions, specifically through the superficial peroneal nerve.
The tibialis posterior is a smaller, deep muscle in the lower leg that is involved in plantar flexion and inversion, the inward turning of the sole of the foot. It is the most powerful of the deep muscles and is innervated by the tibial nerve, along with the flexor digitorum longus and flexor hallucis longus. Together, these muscles enable plantar flexion and help to stabilise the ankle.
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Flexor digitorum brevis flexes all toes except the little toe
The flexor digitorum brevis is a broad muscle found deep in the sole of the foot. It is responsible for flexing the second to fifth digits at the metatarsophalangeal and proximal interphalangeal joints. This muscle also supports the longitudinal arch of the foot and helps to stabilize the foot while walking or running.
When the flexor digitorum brevis contracts, the toes curl under. Its tendons run medially to the common plantar digital nerves and vessels. The innervation for this muscle comes from the medial plantar nerve (S1-S3), which is the larger of the two terminal branches of the tibial nerve. The flexor digitorum brevis is vascularized by the branches of the posterior tibial artery; medial plantar and lateral plantar arteries.
The flexor digitorum brevis is situated lateral to the abductor digiti minimi and medial to the abductor hallucis muscles. It runs deep to the thick layer of the plantar aponeurosis. Deep to the flexor digitorum brevis, you can find the quadratus plantae and lumbrical muscles, along with the tendons of the flexor digitorum longus muscle.
The flexor digitorum brevis is different from the flexor digitorum longus muscle, which also acts as a flexor of the phalanges. The flexor digitorum longus muscle is situated on the tibial side of the leg and serves to flex the second, third, fourth, and fifth toes. It passes obliquely forward and lateralward, superficial to the deltoid ligament of the ankle joint, into the sole of the foot. It then expands and is joined by the quadratus plantæ muscle, and finally divides into four tendons, which are inserted into the bases of the last phalanges of the second to fifth toes.
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Frequently asked questions
The muscles that flex the big toe are the flexor hallucis brevis, flexor hallucis longus, and abductor hallucis.
The flexor digitorum longus muscle is responsible for the movement and curling of the second, third, fourth, and fifth toes. The flexor digitorum brevis and quadratus plantae muscles also contribute to the flexion of these toes.
Plantar flexion is the motion of pointing the foot downwards, allowing a person to stand on their toes or point their foot. This movement is controlled by several muscles, including the flexor hallucis longus, flexor digitorum longus, tibialis posterior, peroneus longus, and peroneus brevis.
