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Bones, muscles, and joints make up the musculoskeletal system. Muscles attach to bones through connective tissues called tendons. Tendons are fibrous tissues that connect muscles to bones all over the body. They allow limbs to move and help prevent muscle injury. Tendons are mostly collagen, one of the most abundant proteins in the body. They also contain blood vessels and nerves. The point where the tendon attaches to the muscle is called the musculotendinous junction (MTJ), and the point where the tendon attaches to the bone is called the osteotendinous junction (OTJ).
| Characteristics | Values |
|---|---|
| What connects muscle to bone | Tendons |
| What are tendons | Fibrous connective tissues |
| What are tendons made of | Collagen fibres |
| What do tendons do | Transmit muscle forces to the bones and joints |
| What is the point where the tendon attaches to the bone called | Osteotendinous junction (OTJ) |
| What is the point where the muscle pierces the tendon called | Musculotendinous junction (MTJ) |
| What is the most common type of joint | Synovial joints |
| What is found in synovial joints | Thick gel called synovial fluid |
| What do tendons respond to | Changes in mechanical loading with growth and remodelling processes |
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What You'll Learn
Tendons are fibrous tissues that attach muscles to bones
Tendons transmit muscle forces to the bones and joints. They are strong, flexible tissues, similar to a rope, with small collagen fibres arranged in bundles. This bundling reinforces the tendon and makes it stronger. Sharpey fibres, which are part of the tendon, extend into the bone. 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 musculotendinous junction (MTJ) is the point where the tendon attaches to the muscle. This is a frequent site of injury. The osteotendinous junction (OTJ) is the point where the tendon attaches to the bone. Tendons of the hand or foot commonly slide through a connection called a reflection pulley that helps hold them in place. Small, fluid-filled pads called tendon bursae cushion tendons where they meet the bone.
Tendons allow limbs to move and help prevent muscle injury. They absorb some of the impact that muscles take during movements like running and jumping.
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Tendons transmit muscle forces to bones and joints
Tendons are fibrous tissues that connect muscles to bones all over the body. They are mostly made of collagen, one of the most abundant proteins in the body, and also contain blood vessels and nerves. 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 delicate movements.
The point where a tendon attaches to a muscle is called the musculotendinous junction (MTJ), and the point where a tendon attaches to a bone is called the osteotendinous junction (OTJ). Sharpey fibres, a type of collagen fibre, attach the tendon to the bone. Tendons can also attach muscles to structures other than bones, such as the eyeball.
Tendons act as levers, transmitting muscle forces to bones and joints to enable movement and maintain body posture. When a muscle is tightened or relaxed, the tendon pulls the attached bone, causing it to move. This allows limbs to move and helps prevent muscle injury by absorbing some of the impact from activities such as running or jumping.
The tendon's ability to transmit muscle forces is linked to its crimps. Higher tendon loads produce wider angles at a crimp's base, and tendon stretch gradually flattens the crimps, which act as shock absorbers. Tendons are highly resistant to tearing but are not stretchy, making them susceptible to strains or tears when strained. Tendons are prone to damage due to ageing, overuse, injury, and health conditions such as arthritis.
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Muscles are attached to bones directly or via tendons
Bones, muscles, and joints make up the musculoskeletal system. Muscles are attached to bones directly or via tendons. Tendons are the most common form of attachment, serving as a "mechanical bridge" that transmits muscle forces to the bones and joints. They are fibrous connective tissues that attach muscle to bone, allowing limbs to move and helping to prevent muscle injury. Tendons are mostly collagen, one of the most abundant proteins in the body. They contain collagen fibres called Sharpey fibres that attach the tendon to the bone. Sharpey fibres also extend into the bone.
The point where the tendon attaches to the muscle is called the musculotendinous junction (MTJ), and the point where the tendon attaches to the bone is called the osteotendinous junction (OTJ). Tendons of the hand or foot commonly slide through a connection called a reflection pulley that helps hold them in place. Small, fluid-filled pads called tendon bursae cushion tendons where they meet the bone.
The connective tissue associated with muscles provides structural support and serves as points of attachment to the respective bones. The connective tissue coverings of individual muscle fibres (endomysium), bundles of muscle fibres (perimysium), and the whole muscle itself (epimysium) continue beyond the ends of the muscle cells to attach the muscle to one or more bones.
Tendons are subject to many types of injuries, including inflammation, degeneration, and weakening, which may eventually lead to tendon rupture. Tendon issues are more common with age, as tendons become thinner, have less blood flow, and accumulate microscopic damage to fibres that weaken the tendon.
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Tendons are susceptible to injury and disorders
Tendons are fibrous tissues that connect muscles to bones, allowing for movement and preventing muscle injury. They are mostly made up of collagen, a strong and flexible protein that is resistant to damage. However, tendons are susceptible to injury and disorders, which can cause chronic pain and reduced functionality.
Tendons are susceptible to injury, especially when strained beyond their limits. Overuse is a common cause of tendon injuries, as repetitive or prolonged activities, forceful exertion, and sudden increases in intensity or frequency of movements can strain the tendon, leading to small tears in the fibres. This is often seen in athletes who overtrain or individuals who suddenly increase their activity levels. Tendons can also be injured through direct impact or trauma, such as a fall or collision.
Age-related changes make tendons more prone to injury. As people get older, tendons become thinner, less elastic, and accumulate microscopic damage, making them weaker and more susceptible to tearing. Additionally, decreased estrogen levels in older women can loosen tendinous tissue, further increasing the risk of traumatic injury.
Tendinopathies are disorders that affect the normal functioning of tendons. Tendinosis is a type of tendinopathy characterised by the breakdown of collagen in the tendon, resulting in a loss of strength and elasticity. Tendinosis can occur when tendon injuries do not heal properly or due to overuse and chronic inflammation. Tendinitis, another form of tendinopathy, refers to the inflammation or irritation of a tendon, often caused by repetitive activities or prolonged periods of exertion. This leads to an inflammatory response, causing the tendon to become thickened, bumpy, and irregular. If left untreated, tendinitis can develop into chronic tendinopathy.
Other tendon disorders include tenosynovitis, which is the inflammation of tendon sheaths. De Quervain's disease, for example, is a type of tenosynovitis affecting the tendon sheaths at the base of the thumb. Lateral epicondylitis, or tennis elbow, is another tendon disorder characterised by inflammation where forearm muscles attach to the lateral epicondyle above the elbow.
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Tendons can become ossified in some organisms
Tendons are fibrous tissues that connect muscles to bones. They are present throughout the entire muscle's length and act as a "mechanical bridge", transmitting muscle forces to the bones and joints. They also help muscles complete joint movements along a plane. Sharpey fibres, a type of collagen fibre, attach the tendon to the bone.
Heterotopic ossification, a specific type of ossification, occurs when bone tissue formation happens outside of the skeleton. This can lead to the development of bone tissue in atypical locations, such as in tendons. Tendonitis is often considered a precursor to heterotopic ossification, as inflammation in aged tendons can trigger this process.
Achilles tendon ossification is a relatively common finding, especially in older individuals. It is often the result of previous trauma or tendinopathy, and the size of the ossification can vary. In some cases, operative excision and tendon repair or reconstruction may be necessary to alleviate pain and disability caused by fractures in ossified tendon tissue.
The study of ossified tendons in fossils has provided important clues about the physiological aspects of organism functions, particularly in dinosaurs and ancient birds. For example, the presence of osteocytes in fossilized tendon structures indicates a functional lacunal-canalicular cellular network in the ossified tendons of ornithischian dinosaurs.
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Frequently asked questions
Muscles are attached to bones by tendons, which are fibrous connective tissues. Tendons are the most common form of attachment and allow the tension created by the contractile component of the muscle to be transmitted to the associated bones so that joint movement can occur.
Tendons transmit muscle forces to the bones and joints, allowing your limbs to move and helping to prevent muscle injury. Tendons also help to stabilise the joint so that it can only move in certain directions.
Examples include the biceps brachii and the latissimus dorsi.
