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Metatarsal bones

life science Maturity 11-13 Next article →

The metatarsal bones form the central structure of the human midfoot. Collectively, this group of five long bones is known as the metatarsus. These bones occupy the space between the tarsal bones, which make up the ankle and heel, and the phalanges, which are the toes.

Ospied-en
Ospied-en

Because they connect the ankle to the toes, they are essential for weight-bearing and movement. In humans, these bones are functionally similar to the metacarpal bones found in the hand. While a bovine hind leg contains only two metatarsals, humans rely on five to support the complex mechanics of walking and balance.

Each metatarsal bone follows a specific anatomical structure consisting of three main parts. The proximal end is called the base, which is wedge-shaped. The middle section is the shaft, or body, which is prismoid in form. The distal end is known as the head.

Gray268 - Mratatarsus
Gray268 - Mratatarsus

The body of the bone tapers gradually from the tarsal end to the phalangeal end. It also features a longitudinal curve that is concave on the bottom and slightly convex on the top. The head presents a convex articular surface that is oblong when viewed from above. On the bottom, the head has a groove for the passage of flexor tendons.

These bones are identified by number rather than individual names. We number them from the medial side, which is the side of the great toe. The first metatarsal is the most medial, followed by the second, third, fourth, and fifth. Interestingly, the bones are not equal in size. In humans, the second metatarsal is the longest. The descending order of length is the second, third, fourth, fifth, and finally the first metatarsal.

Gray269 - Mratatarsus
Gray269 - Mratatarsus

During development, growth plates are located distally on most metatarsals. However, the first metatarsal is unique because its growth plate is located proximally. It is also common to find an accessory growth plate on the distal end of the first metatarsal.

Movement in the foot is made possible through various articulations, or joints. The bases of the metatarsals connect to the tarsal bones at the tarsometatarsal joints. Specifically, the first metatarsal joins the medial cuneiform and partly the intermediate cuneiform. The second metatarsal connects with all three cuneiforms. The third meets the lateral cuneiform, while the fourth connects to the lateral cuneiform and the cuboid. The fifth metatarsal articulates with the cuboid.

Ospied-en
Ospied-en

Additionally, the heads of the bones connect to the first row of phalanges at the metatarsophalangeal joints. The bases also connect to one another at the intermetatarsal joints.

Muscles attach to these bones at specific points to facilitate movement. For example, the tibialis anterior muscle inserts at the basis of the first metatarsal. The peroneus longus attaches to the tuberosity of the first metatarsal. On the fifth metatarsal, the peroneus brevis attaches to its tuberosity, and the flexor digiti minimi brevis originates from its basis.

Gray269 - Mratatarsus
Gray269 - Mratatarsus

Other muscles, such as the dorsal and plantar interossei, attach to the sides of the bones. These attachments allow the muscles to pull on the bones, creating the controlled motions needed for locomotion.

Because the metatarsals support so much weight, they are susceptible to injury. Stress fractures are a significant concern and account for approximately 16% of injuries related to sports. These are often called march fractures because they were traditionally associated with military recruits performing long marches. The second and third metatarsals are frequently injured because they remain fixed while a person walks. The fifth metatarsal may fracture if the foot undergoes oversupination during movement.

FractureBaseof5th
FractureBaseof5th

These injuries highlight the intense physical demands placed on the midfoot structure.

Modern equipment can influence the frequency of these bone injuries. For instance, association football (soccer) players often experience metatarsal breaks. Researchers have attributed this to the lightweight design of modern football boots, which offer less protection. In 2010, some players began testing specialized socks that included a rubber silicone pad to protect the top of the foot. To prevent such injuries, safety footwear can be used, often featuring built-in or removable metatarsal guards. Understanding the anatomy and vulnerabilities of the metatarsus is vital for both medical care and athletic safety.

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File:Ospied-en.svg
Ospied-en.svg
File:Gray268 - Mratatarsus.png
Gray268 - Mratatarsus.png
File:Gray269 - Mratatarsus.png
Gray269 - Mratatarsus.png
File:FractureBaseof5th.png
FractureBaseof5th.png
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