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Foot Anatomy

Foot Anatomy

 

The important structures of the foot can be divided into several categories. These include:

Bones and joints

Ligaments and tendons

Muscles

Nerves

Blood vessels

 

Bones & Joints

The skeleton of the foot begins with the talus, or ankle bone, which forms part of the ankle joint. The two bones of the lower leg, the large tibia and the smaller fibula come together at the ankle joint.

The two bones that make up the back part of the foot (sometimes referred to as the hind foot) are the talus and the calcaneus, or heel bone. The talus is connected to the calcaneus at the subtalar joint. The ankle joint allows the foot to bend up and down. The subtalar joint allows the foot to rock from side to side.

Down the foot from the ankle is a set of five bones called tarsal bones that work together as a group. There are multiple joints between the tarsal bones. When the foot is twisted in one direction by the muscles of the foot and leg, these bones lock together and form a very rigid structure. When they are twisted in the opposite direction, they become unlocked and allow the foot to conform to whatever surface the foot is contacting.

The tarsal bones are connected to the five long bones of the foot called the metatarsals. The two groups are fairly rigidly connected, without much movement at the joints.

Finally, there are the bones of the toes, the phalanges. The joint between the metatarsals and the first phalanx is called the metatarsal phalangeal joint (MTP). These joints form the ball of the foot, and movement in these joints is very important for a normal walking pattern.

Not much motion occurs at the joints between the bones of the toes. The big toe, or hallux, is the most important toe for walking, and the first MTP joint is a common area for problems in the foot.

Video of foot anatomy

Ligaments & Tendons

Ligaments are the soft tissues that attach bones to bones.  Ligaments are very similar to tendons. The difference is that tendons attach muscles to bones. Both of these structures are made up of small fibres of a material called collagen. The collagen fibres are bundled together to form a rope-like structure. Ligaments and tendons come in many different sizes, and like rope, are made up of many smaller fibres. The thicker the ligament (or tendon) the stronger it is.

The large Achilles tendon is the most important tendon for walking, running, and jumping. It attaches the calf muscles to the heel bone to allow us to rise up on our toes. The posterior tibial tendon attaches one of the smaller muscles of the calf to the underside of the foot. This tendon helps support the arch and allows us to turn the foot inward. The toes have tendons attached on the bottom that bend the toes down and attached on the top of the toes that straighten the toes. The anterior tibial tendon allows us to raise the foot. Two tendons run behind the outer bump of the ankle (lateral malleolus) and attach to the outside edge of the foot. These two tendons help turn the foot outward.

anatomy

Many small ligaments hold the bones of the foot together. Most of these ligaments form part of the joint capsule around each of the joints of the foot. A joint capsule is a watertight sack that forms around all joints. It is made up of the ligaments around the joint and soft tissue between the ligaments that fills in the gaps and forms the sack.

Muscles

Most of the motion of the foot is caused by the stronger muscles in the lower leg whose tendons connect in the foot. Contraction of the muscles in the leg is the main way that we move our feet to stand, walk, run, and jump.

There are numerous small muscles in the foot. Most of the muscles of the foot are arranged in layers on the sole of the foot. These muscles move the toes and provide padding underneath the sole of the foot.

anatomy

Nerves

The main nerve to the foot, the posterior tibial nerve, enters the sole of the foot by running behind the inside bump on the ankle (medial malleolus). This nerve supplies sensation to the toes and sole of the foot and controls the muscles of the sole of the foot. Several other nerves run into the foot on the outside of the foot and down the top of the foot. These nerves primarily provide sensation to different areas on the top and outside edge of the foot.

Blood Vessels

The main blood supply to the foot, the posterior tibial artery, runs right beside the nerve of the same name. Other less important arteries enter the foot from other directions. One of these arteries is the dorsalis pedis that runs down the top of the foot. You can feel your pulse where this artery runs in the middle of the top of the foot.

foot anatomy –

Summary

The anatomy of the foot is very complex. When everything works together, the foot functions correctly. When one part becomes damaged, it can affect every other part of the foot and lead to problems.

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