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Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage, specifically to the peripheral nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT causes a range of sensory and motor symptoms, including numbness, tingling, pain, muscle weakness, and atrophy. CMT often affects nerves that control a person's muscles, causing muscle weakness and muscle shrinking, or atrophy. This muscle weakness from CMT usually starts in the feet and lower legs and can spread to the fingers, hands, and arms. CMT-induced atrophy is a specific type of muscle tissue loss where the tissue has wasted away and been replaced by fat.
| Characteristics | Values |
|---|---|
| What is CMT? | Charcot-Marie-Tooth disease (CMT) is a group of genetic conditions that affect the nerves connecting the brain and spinal cord to the rest of the body. |
| CMT's effect on muscles | CMT causes muscle weakness, reduction in size (atrophy), and some loss of sensation in the lower legs and feet. |
| Muscle atrophy | CMT causes neurogenic muscle atrophy, a specific type of muscle tissue loss. |
| Preventing muscle atrophy | Exercise helps to maintain muscles that have not yet been affected by neurogenic atrophy. |
| CMT's effect on movement | CMT causes problems with muscle control and movement. |
| CMT's effect on gait | CMT causes foot drop, making it difficult to lift the foot at the ankle, leading to frequent tripping and an abnormal gait. |
| CMT's effect on other parts of the body | CMT can cause curvature of the spine (scoliosis or kyphosis). In severe cases, CMT can affect nerves other than those that go to and from the extremities, leading to respiratory impairment. |
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What You'll Learn
CMT causes muscle weakness and atrophy
Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage, specifically to the peripheral nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT causes muscle weakness and atrophy, which can lead to a range of physical symptoms and difficulties.
The peripheral nerves are covered by a protective coating called the myelin sheath, which helps nerve signals travel quickly and smoothly. When the myelin sheath is damaged, signals can slow down, weaken, or fail to transmit properly, affecting the nerves' ability to control muscles. This damage can lead to muscle weakness and atrophy, where the muscles waste away and are replaced by fat.
Muscle weakness from CMT usually starts in the feet and lower legs during adolescence or early adulthood, but it can appear at any age. It can cause a condition called foot drop, where there is difficulty lifting the foot at the ankle, leading to frequent tripping and an abnormal gait. The weakness can also spread to the fingers, hands, and arms over time, causing further difficulties with movement and coordination.
The atrophy associated with CMT is specifically neurogenic atrophy, which occurs due to injury or disease of the nerve that controls the muscle. This type of atrophy is non-recoverable, and its progression cannot be slowed or predicted. However, CMT specialists recommend exercise and physical activity to help maintain muscles that have not yet been affected by neurogenic atrophy.
In addition to muscle weakness and atrophy, CMT can cause a range of other symptoms, including numbness, tingling, pain, foot deformities, and problems with breathing, swallowing, or speaking if the muscles that control these functions are affected. CMT can also affect the nerves that control automatic body functions, leading to issues with sweating and dizziness. While there is no cure for CMT, treatments such as physical therapy, orthopedic devices, surgery, and medication can help manage symptoms.
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CMT affects nerves controlling muscles
Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage. CMT affects the peripheral nerves, which are the nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT causes a range of sensory and motor symptoms, including numbness, tingling, pain, muscle weakness, and atrophy.
Motor nerves control muscle movements. When these nerves break down, they lose the ability to communicate with muscles, leading to muscle weakness and atrophy. CMT often affects the nerves that control a person's muscles, and muscle weakness from CMT usually starts in the feet and lower legs during the teen years or early adulthood. Over time, the weakness can spread to the fingers, hands, and arms.
The peripheral nerves send electrical signals over long distances down a long, thin part of the nerve cell called the axon. The axon is covered by myelin, which helps signals travel quickly and smoothly through the nerves. When the axon or myelin sheath is damaged, signals slow down, weaken, or fail to transmit properly, making it harder for nerves to control muscles.
Different forms of CMT involve mutations in different genes that produce proteins needed for the axon or myelin to work, but all forms of CMT affect the function of peripheral nerves. Gene defects in myelin and the axons can cause them to stop working properly, disrupting nerve signals and sometimes leading to nerve loss. CMT can affect the ability to control muscles, leading to muscle weakness and atrophy.
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CMT causes nerve damage, disrupting signals to muscles
Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage, specifically to the peripheral nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT is the most common inherited neuropathy and causes a range of sensory and motor symptoms.
CMT causes damage to the sensory nerve fibres (axons), which are covered by myelin, a protective coating that helps signals travel quickly and smoothly through the nerves. When the axon or myelin sheath is damaged, signals slow down, weaken, or fail to transmit properly, disrupting nerve signals and sometimes leading to nerve loss. This makes it harder for nerves to control muscles, resulting in muscle weakness and muscle atrophy or shrinking.
The muscles that control the feet, lower legs, forearms, and hands are most affected by CMT. Muscle weakness usually starts in the feet and lower legs during the teenage years or early adulthood, but symptoms can appear at any age. Over time, the weakness can spread to the fingers, hands, and arms. Foot drop, a common symptom of CMT, causes difficulty lifting the foot at the ankle, leading to frequent tripping and an abnormal gait.
In addition to muscle weakness and atrophy, CMT can cause contractures (stiffened joints) and foot deformities such as hammertoes and high arches. CMT can also affect the nerves that control automatic body functions, leading to problems with sweating and dizziness. While there is no cure for CMT, treatments such as physical therapy, orthopedic devices, surgery, and medication can help manage symptoms.
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CMT causes muscle loss due to neurogenic atrophy
Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage, specifically to the peripheral nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT is the most common inherited neuropathy, causing a range of sensory and motor symptoms, including muscle weakness and atrophy.
Motor nerves control muscle movements, and when they break down, they lose the ability to communicate with muscles, leading to muscle weakness and atrophy. In CMT, this muscle weakness usually starts in the feet and lower legs during the teenage years or early adulthood, but symptoms can appear at any age. Over time, the weakness can spread to the fingers, hands, and arms.
Muscle atrophy is the thinning or loss of muscle tissue and mass. There are three types of atrophy: physiologic, pathologic, and neurogenic. CMT causes neurogenic atrophy, which occurs when there is an injury to or disease of the nerve that controls the muscle. In the context of CMT, muscle tissue affected by neurogenic atrophy wastes away and is replaced by fat. This type of atrophy is non-recoverable, meaning the muscle mass that was lost cannot be rebuilt.
While there is currently no cure for CMT, treatments such as physical therapy, orthopedic devices (e.g., braces), surgery, and medication can help manage symptoms. Exercise is also recommended for CMT patients to help maintain muscles that have not yet been affected by neurogenic atrophy.
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CMT causes foot deformities, leading to frequent falls
Charcot-Marie-Tooth disease (CMT) is a group of inherited disorders that cause nerve damage, specifically to the peripheral nerves—the nerves that transmit information and signals from the brain and spinal cord to the rest of the body. CMT is the most common inherited neuropathy.
CMT often affects nerves that control a person's muscles, causing muscle weakness or muscle shrinking (called atrophy). Muscle weakness from CMT usually starts in the feet and lower legs during the teen years or early adulthood, but symptoms can appear at any age. Over time, the weakness can spread to the fingers, hands, and arms. CMT can also cause foot deformities such as hammertoes and high arches, as well as toe contractures. These deformities can lead to frequent tripping or falling due to gait disorders and changes in how the muscles in the legs and feet work.
The foot deformities and muscle weakness caused by CMT can make it difficult to walk and increase the risk of falling. CMT can affect the nerves that control muscle movement, leading to problems with muscle control and coordination. The weakness in the foot and lower leg muscles can make it hard to lift the foot (foot drop), resulting in a high-stepping walking pattern and frequent tripping or falling.
In addition to the physical challenges, CMT can also impact a person's quality of life. The frequent falls and difficulty with walking can limit their mobility and independence. CMT is a progressive disease, which means that the symptoms will gradually worsen over time. However, while there is currently no cure for CMT, treatments such as physical therapy, orthopedic devices (e.g. braces or AFOs), surgery, and medication can help manage the symptoms and improve quality of life.
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Frequently asked questions
CMT stands for Charcot-Marie-Tooth disease, a group of inherited disorders that cause nerve damage.
Yes, CMT causes muscle weakness and reduction in size (atrophy). It is a result of neurogenic atrophy, which occurs when the nerve that controls the muscle is injured or diseased.
Symptoms of CMT include numbness, tingling, pain, muscle weakness and atrophy, and foot deformities that get worse over time.
While there is no cure for CMT, treatments such as physical therapy, orthopedic devices (e.g. braces), surgery, and medication can help manage symptoms. Exercise is also recommended to maintain muscles that have not yet been affected by neurogenic atrophy.
