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The human foot is a highly specialised structure, with 26 bones, 33 joints, over 100 tendons and ligaments, and more than 20 muscles. The toes have flexor and extensor muscles that power their movement and play a large role in balance. The flexor digitorium longus, for example, attaches to every toe except the big toe, and is responsible for flexing the toes. The flexis hallucis longus is another muscle that plays a large role in curling the toes. The peroneus longus and brevis muscles also help keep the foot stable and lift the arches of the feet.
| Characteristics | Values |
|---|---|
| Number of muscles in the foot | 20+ |
| Toe muscles | Flexor and extensor muscles |
| Example of plantar flexion | Standing on tiptoes |
| Muscles involved in plantar flexion | Flexis hallucis longus, flexor digitorium longus, peroneus longus, peroneus brevis, Achilles tendon |
| Muscle that extends from the back of the knee to the heel | Soleus |
| Large muscle of the leg that connects to the heel | Gastrocnemius (calf muscle) |
| Small, thin muscle that is absent in about 5-10% of people | Plantaris |
| Muscle on the inner side of the foot that runs from the big toe to the heel | Abductor hallucis |
| Muscle that starts at the upper section of the fibula and attaches to the bones below the large "knuckle" of the big toe | Peroneus longus |
| Muscle that lies just underneath the peroneus longus | Peroneus brevis |
| Bone in the middle of the outer foot that the fibularis brevis attaches to | Fifth metatarsal |
| Muscle that extends from the knee to the big toe | Fibularis longus |
| Number of bones in the foot | 26 |
| Bones in the toes | 14 phalanges |
| Bones that make up the metatarsals | 5 |
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What You'll Learn
The flexor digitorum longus muscle flexes the toes
The flexor digitorum longus is a muscle that starts on the back of the tibia, near the soleus muscle. It is one of the muscles responsible for the power to flex the toes. The flexor digitorum longus ends in a tendon that travels through the ankle and along the bottom of the foot, attaching to every toe except the big toe.
The toes have flexor and extensor muscles that power their movement and play a large role in balance. The flexor digitorum longus is one of the muscles that provides the power to flex the toes, allowing for movement and balance. This muscle works in conjunction with other muscles and tendons in the foot and leg to enable a wide range of movements and support the foot's arches.
The flexor digitorum longus is an extrinsic muscle, meaning it starts in the lower leg, wraps around the ankle, and attaches to the foot. These types of muscles allow the foot to move in multiple directions, including inward and outward. The intrinsic muscles, on the other hand, are confined exclusively to the foot and help support the foot's arches.
The flexor digitorum longus works in conjunction with other muscles to lift the arches of the feet and enable movement. The foot has a series of pulley systems that allow for complex movements. The pulley of the ankle bone, for example, lifts the arches of the feet using the muscles of the lower leg, including the flexor digitorum longus, to position the bones of the foot.
The flexor digitorum longus is a crucial muscle for maintaining balance and enabling movement. Its function, along with other muscles and tendons, helps to keep the foot stable and allows for a wide range of activities, from walking and running to more complex movements like dancing en pointe.
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The flexis hallucis longus curls the toes
The human foot is a highly specialised structure, with 26 bones, numerous joints, and over 100 tendons, ligaments, and muscles. The toes have flexor and extensor muscles that power their movement and play a large role in balance.
The flexor hallucis longus is one such muscle that curls the toes. This muscle starts along the back of the fibula and goes through the ankle, running along the sole of the foot to attach to the big toe. It helps with plantar flexion of the ankle, which is the term for positioning the foot with the toes pointing downwards. This is important for standing on tiptoes, for example, when reaching something on a high shelf or when on pointe in ballet.
The flexor hallucis longus is one of the three deep muscles of the leg. It plays a large role in curling the toes and is very important for walking and balancing, especially when on tiptoe. It works with the Achilles tendon to flex the ankle and knee joints, allowing a person to stand on their toes.
The flexor hallucis longus is not the only muscle that contributes to toe movement. The flexor digitorum longus, for example, attaches to every toe except the big toe and provides the power to flex the toes. The peroneus longus and peroneus brevis muscles also help keep the foot stable, and the abductor hallucis pulls the big toe away from the body.
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The peroneus longus and brevis muscles stabilise the foot
The human foot is an evolutionary marvel, allowing us to walk and run while absorbing impacts that can exceed our body weight. The foot's flexibility and movement are made possible by over 20 muscles, more than 100 tendons and ligaments, and 26 bones.
The peroneus longus and brevis muscles are crucial for stabilising the foot and maintaining balance. The peroneus longus originates in the upper section of the fibula bone, extending downwards and attaching to the medial cuneiform and first metatarsal—the bones below the large knuckle of the big toe. Meanwhile, the peroneus brevis originates in the shaft of the fibula, with its tendon stretching to the foot and attaching to the metatarsal of the little toe.
These two muscles work in tandem with the tibialis posterior, particularly in the middle foot region. They provide essential support for the weight-bearing arches of the foot and help maintain ankle stability when standing or rising onto the toes. Their role in plantar flexion, or positioning the foot with the toes pointed downwards, is vital for balance and stability.
The peroneus longus and brevis muscles are part of a series of pulley systems in the body that enable complex movements. The pulley of the ankle bone, in conjunction with these muscles, lifts the arches of the feet, positioning the bones of the foot for optimal function. The arches are load-bearing structures that require stability to effectively support the body's weight.
Maintaining the health of these muscles is crucial for overall foot stability and injury prevention. Strengthening exercises, such as toe raises, swimming, and biking, can help improve flexibility and strength in the feet, ankles, and legs.
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The abductor hallucis pulls the big toe away from the body
The human foot is a highly specialised structure, with 26 bones, about a quarter of all the bones in the human body. The toes have flexor and extensor muscles that power their movement and play a large role in balance. One such muscle is the abductor hallucis, which is responsible for pulling the big toe, or hallux, away from the body.
The abductor hallucis is a muscle on the inner side of the foot that runs from the big toe to the heel. It is one of the 20-plus muscles in the foot that enable movement and give the foot its shape. The big toe itself has two phalanges, similar to the thumb, while the other toes have three phalanges. The metatarsophalangeal joint (MCP) at the base of the big toe is particularly important as it briefly bears half the body's weight when pushing off during walking.
The abductor hallucis is not the only muscle that affects the big toe. The flexor digitorum longus, for example, attaches to every toe except the big toe and provides the power to flex them. The flexis hallucis longus, on the other hand, attaches to the big toe and helps with plantar flexion, which is the action of standing on tiptoes or pointing the foot. This muscle plays a large role in curling the big toe and is important for walking and balancing, especially when on tiptoe.
The peroneus longus muscle also attaches to the big toe and helps to keep the foot stable. It starts at the upper section of the fibula and runs down to attach to the medial cuneiform and first metatarsal, which are the bones below the large "knuckle" of the big toe. Together, these muscles and tendons work in plantar flexion to help the body stay balanced and stable.
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The soleus muscle extends from the knee to the heel
The soleus muscle is a powerful muscle in the back of the lower leg, or calf. It extends from just below the knee to the heel, where it connects to the Achilles tendon. The soleus muscle is closely connected to the gastrocnemius muscle, and together they form the calf muscle. Some anatomists even consider the soleus and gastrocnemius to be a single muscle, known as the triceps surae.
The soleus is involved in various basic activities, such as walking, running, and jumping. It is particularly important for maintaining an upright posture. As the body's centre of gravity is anterior to the ankle joint, there is a natural tendency for the body to lean forward. However, this is counteracted by the soleus muscle, which produces a continuous state of plantar flexion when standing. Plantar flexion is a term that describes positioning the foot with the toes furthest down.
The soleus is the most effective muscle for plantar flexion when the knee is bent. This is because the gastrocnemius originates on the femur, so bending the leg limits its effective tension. During regular movement, such as walking, the soleus is the primary muscle utilised for plantar flexion due to its slow-twitch fibres that resist fatigue.
The soleus muscle is also involved in pumping venous blood back into the heart from the periphery, and is often called the skeletal muscle pump or the sural pump. It is a wide, flat muscle, and its size and shape, along with that of the gastrocnemius, determine the differences in the appearance of human calves.
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Frequently asked questions
The flexor digitorium longus attaches to every toe except the big toe, and it is this muscle that provides the power to flex the toes. The flexis hallucis longus helps with plantar flexion and plays a large role in curling the toes. The peroneus longus and brevis muscles also help keep the foot stable.
Plantar flexion is a term that describes positioning the foot with the toes pointing downwards. This can be observed when standing on tiptoes, pressing the foot down on a car pedal, or when ballet dancers dance on the tips of their toes (en pointe).
The 20-plus muscles in the foot enable movement and give the foot its shape. The toes have flexor and extensor muscles that power their movement and play a large role in balance.
