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Tendons are fibrous connective tissues that attach muscles to bones. They are made of collagen, a protein found in the body, along with blood vessels and nerves. They are responsible for transmitting muscle forces to the bones and joints, allowing for movement and maintaining body posture. Tendons are prone to damage due to their presence throughout the body, and injuries can occur at the site where the tendon attaches to the muscle.
| Characteristics | Values |
|---|---|
| What is a tendon | A fibrous connective tissue |
| What does it connect | Connects muscle to bone |
| Where is it located | All over the body |
| What does it look like | A rope or fiber optic cable |
| What is it made of | Collagen, a protein found in the body, blood vessels, and nerves |
| How does it work | Transmits muscle forces to the bones and joints |
| What is its function | Allows movement and helps prevent muscle injury |
| What are common injuries | Strains, tears, tendonitis, tendinosis, and tenosynovitis |
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What You'll Learn
Tendons connect muscles to bones
Tendons are fibrous connective tissues that connect muscles to bones. They are made of strong, flexible collagen fibres, which are resistant to tearing but not very stretchy. Tendons are stiffer than muscles and can handle a lot of weight. They transmit muscle forces to the bones and joints, acting as levers to enable movement and maintain body posture.
The muscle's connective tissue layers (epimysium, perimysium, and endomysium) merge to attach to one or more fixed osseous points. Tendon tissue close to the muscle has contractile fibres, and the muscle influences tendon activity. Tendons are prone to damage because they are attached to muscles all over the body, and they can get damaged due to ageing, overuse, injury, or health problems like arthritis. Strains occur when a tendon is twisted, pulled, or torn. Tendinosis is inflammation or swelling due to ageing, too much activity, or overuse.
Tendons have different shapes and sizes based on the muscle they are attached to. Wide and short tendons are attached to muscles for strong, forceful movements, while thin and long tendons are connected to muscles for delicate movements. The bundling of collagen fibres reinforces the tendon and makes it stronger. The collagen fibres are arranged in primary, secondary, and tertiary bundles, with the tertiary bundle forming the tendon itself. The endotenon is the connective tissue that surrounds the primary, secondary, and tertiary fibre bundles, helping them glide against each other inside the tendon. The epitenon is a thin layer of connective tissue that surrounds the entire tendon.
Tendons in the hand and foot have a protective outer covering called the synovial sheath, which produces a lubricating fluid to help the tendon move smoothly at the junction between the muscle and bone. This junction is called the musculotendinous junction (MTJ) and is a frequent site of injury. The point where the tendon attaches to the bone is called the osteotendinous junction (OTJ). The tendon of the hand and foot commonly slides through a connection called a reflection pulley that helps hold it in place. Small, fluid-filled pads called tendon bursae cushion tendons where they meet the bone, reducing friction and enabling the tendon to glide smoothly.
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Tendons are mostly made of collagen
The structure of a tendon is similar to a fibre optic cable or a rope, with small collagen fibres arranged in bundles. This bundling reinforces the tendon and makes it stronger. The collagen fibrils are parallel to each other and closely packed, but they have a wave-like appearance due to planar undulations or crimps. The crimps in the collagen fibrils give the tendons some flexibility and a low compressive stiffness.
The collagen fibres in tendons are held together by proteoglycan, a compound consisting of a protein bonded to glycosaminoglycan groups, which are present in connective tissue. The major glycosaminoglycan (GAG) components of the tendon are dermatan sulfate and chondroitin sulfate, which are involved in the fibril assembly process during tendon development. Dermatan sulfate forms associations between fibrils, while chondroitin sulfate occupies the volume between fibrils to keep them separated and help withstand deformation.
The tenocytes produce the collagen molecules, which aggregate end-to-end and side-to-side to form collagen fibrils. Fibril bundles are then organised to form fibres, with the elongated tenocytes closely packed between them. Type I collagen constitutes about 80% of the dry weight of tendons and is responsible for their core strength. As tendons age, the collagen cross-links chemically mature, strengthen, and change in profile, which is associated with tissue development and degeneration.
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Tendons are prone to damage due to ageing, overuse, injury, or health problems
Tendons are fibrous tissues that connect muscles to bones, enabling the transmission of forces and ensuring joint movement. They are made up of firm connective tissue, mostly collagen—one of the body's most abundant proteins. Collagen fibres are flexible, strong, and resistant to damage, but they can still be damaged. Tendons are prone to harm due to overuse, ageing, injury, and health issues.
Overuse injuries, or tendinopathy, are caused by putting too much mechanical stress on the tendon, leading to small injuries and reduced blood supply to the area. This can result from repeating certain movements during sports or other activities, such as spending a lot of time on a computer using a mouse. Tendon overuse can cause tendinosis, a chronic condition where collagen in the tendons accumulates many torn fibres, weakening the tendon and deteriorating its structure. Tendons are also susceptible to acute injuries, where a tendon tears suddenly due to too much strain.
Ageing is a common cause of tendon disorders, with tendons becoming thinner, having less blood flow, and accumulating microscopic damage to fibres that weaken their structure. Age-related hormonal and immunological changes can also contribute to sarcopenia, a condition associated with muscle weakness and reduced locomotor ability in old age. The loss of muscle strength exceeds the loss of muscle size, resulting in a decline in force per unit of muscle cross-sectional area. This deterioration in "muscle quality" increases the risk of tendon injuries.
Injuries can also directly cause tendon disorders, such as strains, tears, and tendonitis (or tendinitis). Tendonitis is an inflammation of the tendons, often due to repetitive activities, overuse, or ageing. It can occur in various parts of the body, such as the Achilles tendon, elbow, hip, knee, shoulder, or thumb. Certain movements or activities can put too much strain on tendons, increasing the risk of injury.
Additionally, health problems can contribute to tendon damage. For example, tendonitis can be caused by inflammatory conditions such as gout, rheumatoid arthritis, or bacterial infections. Other risk factors include diabetes, joint diseases, autoimmune diseases that attack tendon tissue, smoking, and being overweight. While tendon disorders are common, they can be challenging to treat, and full tendon function may not always be regained.
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Tendons transmit forces from muscles to bones
Tendons are fibrous connective tissues that attach muscles to bones. They are made of collagen, a protein found in the body, along with blood vessels and nerves. The collagen fibres are flexible, strong, and resistant to damage and tearing, but not very stretchy. Tendons have different shapes and sizes depending on the muscle they are attached to. Wide and short tendons are attached to muscles for strong, forceful movements, while thin and long tendons are connected to muscles for more delicate movements.
The muscle's connective tissue layers (epimysium, perimysium, and endomysium) merge to attach to one or more fixed osseous points. Tendon tissue close to the muscle has contractile fibres. The muscle influences tendon activity, and vice versa. Tendons act as levers that move the bones when muscles are tightened or relaxed. They transmit the force produced by muscle movement to the bones to enable movement and maintain body posture.
Tendons are prone to damage due to their presence all over the body. They can be damaged by ageing, overuse, injury, or health issues like arthritis. Strains occur when a tendon is twisted, pulled, or torn. Tendinosis is when tendons become inflamed or swollen due to ageing, overuse, or too much activity. Tendons also become thinner and weaker with age, accumulating microscopic damage to their fibres, which weakens them.
The site where the tendon attaches to the muscle is called the musculotendinous junction (MTJ) and is a common site of injury. The point where the tendon attaches to the bone is called the osteotendinous junction (OTJ). The tendon of the hand and foot often slides through a connection called a reflection pulley that holds it in place. Small, fluid-filled pads called tendon bursae cushion tendons where they meet the bone, reducing friction and enabling the tendon to glide smoothly.
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Tendons are stiffer than muscles
Tendons are fibrous tissues that connect muscles to bones all over the body. They are made of connective tissue that contains strong collagen fibres. This makes tendons very resistant to tearing, but not very stretchy. Compared to muscles, tendons have fewer blood vessels, making them prone to injury when overstrained and requiring more time to heal.
Stiff tendons are important for high-speed performance, such as sprinting and jumping, as they transmit forces from the muscles to the bones more directly. This allows for faster movement and improved performance. Training, especially heavy strength training, can help to achieve optimal stiffening of the tendons and improve performance.
Additionally, genetics plays a role in tendon stiffness. A gene variant called E756del, found in individuals of West African ancestry, is associated with stiffer tendons. This variant also provides protection against severe cases of the tropical disease malaria.
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Frequently asked questions
Tendons are fibrous tissues that connect muscles to bones. They are made of collagen, a protein found in the body, along with blood vessels and nerves. They are very resistant to tearing but not very stretchy.
Tendons transmit muscle forces to the bones and joints, allowing the body to move. They also help prevent muscle injury.
Strains occur when you tear, twist or pull a tendon. Tendons are prone to damage due to aging, overuse, injury, or health problems like arthritis.
