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Nerves are enclosed, cable-like bundles of nerve fibers, known as axons, that are part of the peripheral nervous system. They transmit electrical signals from one part of the body to another, controlling voluntary movement, senses, blood pressure, heart rate, and stress response. They also help with digesting food, maintaining heart rate, and breathing. On the other hand, skeletal muscles are one of the three significant muscle tissues in the human body and are considered organs of the muscular system. Each skeletal muscle consists of thousands of muscle fibers wrapped together by connective tissue sheaths. Skeletal muscles have an abundant supply of blood vessels and nerves. This is directly related to their primary function, which is contraction. So, while nerves do not contain muscle fibers, they are essential for muscle function and work in conjunction with them.
| Characteristics | Values |
|---|---|
| Nerve cells | Also called neurons |
| Nerve function | Carry electrical signals from one part of the body to another |
| Nerve composition | Enclosed, cable-like bundle of nerve fibers called axons |
| Nerve location | Throughout the body, including arms, chest, abdomen, face, and legs |
| Nerve types | Sensory nerves, motor nerves, cranial nerves, spinal nerves |
| Nerve control | Voluntary movement, senses, blood pressure, heart rate, stress response |
| Muscle composition | Thousands of muscle fibers wrapped together by connective tissue sheaths |
| Muscle types | Skeletal muscle, smooth muscle, cardiac muscle |
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What You'll Learn
- Nerve cells, or neurons, are present throughout the body, especially in the brain and spinal cord
- Nerves carry electrical signals that help us feel sensations and move muscles
- Nerve fibres are composed of myelinated and non-myelinated fibres
- Nerve conditions and neuropathies can cause muscle palsies
- Nerve fibres are surrounded by a low-protein liquid called endoneurial fluid
Nerve cells, or neurons, are present throughout the body, especially in the brain and spinal cord
Nerve cells, also called neurons, are present throughout the human body. They are the foundational elements of the nervous system, which is comprised of the brain, spinal cord, and nerves. Neurons are responsible for transmitting electrical signals or messages between the brain and the rest of the body. These signals help us feel sensations, move our muscles, and perform essential functions like breathing, swallowing, and speaking.
There are three main types of neurons: sensory, motor, and interneurons. Sensory neurons are triggered by physical and chemical inputs from the environment, such as sound, touch, heat, light, smell, and taste. They carry signals from the senses to the brain, enabling us to touch, taste, smell, see, and process information. Motor neurons, on the other hand, take signals from the brain and spinal cord to the muscles, facilitating movement and assisting with involuntary functions like breathing and swallowing.
Interneurons, the most common type of neuron, act as intermediaries between sensory and motor neurons. They form complex circuits that help us react to external stimuli and play a crucial role in learning, thinking, and memory. These neurons regulate movement in response to sensory information, such as moving away from a hot surface, by passing signals between sensory and motor neurons.
The nervous system can be divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS is a network of nerves branching out from the spinal cord. The PNS relays information from the CNS to various parts of the body, including the organs, arms, legs, fingers, and toes. It is further divided into the somatic nervous system, which guides voluntary movements, and the autonomic nervous system, which regulates involuntary movements and functions.
Nerve fibers, which are part of the nerves, have a unique structure. They consist of axons, which are cord-like groups of fibers surrounded by layers of connective tissue. These axons serve as the “wiring” connection of the nerve, transmitting electrical signals. Some nerve fibers are myelinated, meaning they are wrapped in a myelin sheath, a fatty tissue that insulates the axons and facilitates rapid signal transmission.
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Nerves carry electrical signals that help us feel sensations and move muscles
Nerves are like cables that carry electrical impulses between the brain and the rest of the body. These impulses help us feel sensations and move our muscles. They also maintain certain autonomic functions like breathing, sweating, and digesting food.
Nerve cells are called neurons, and they are present all over the body, especially in the brain and spinal cord. Nerves, along with the brain and spinal cord, are the foundation of the nervous system. The nervous system plays a role in everything we do. It helps us move, think, and feel. It even regulates things we do but don't think about, like digestion.
The nervous system uses nerve cells or neurons to send signals or messages all over the body. These electrical signals travel among the brain, skin, organs, glands, and muscles. The messages help us move our limbs and feel sensations, such as pain. Our eyes, ears, tongue, nose, and the nerves all over our body take in information from our environment. Then, nerves carry that data to and from our brain.
There are different types of neurons, each with a different job. Motor neurons take signals from the brain and spinal cord to the muscles. They help us move and assist with breathing, swallowing, and speaking. Sensory neurons take information from our senses (what we see, touch, taste, etc.) to our brain. Interneurons communicate between motor and sensory neurons. They regulate our movement in response to sensory information and play a role in how we learn, think, and remember.
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Nerve fibres are composed of myelinated and non-myelinated fibres
Nerve cells, or neurons, are present throughout the human body, especially in the brain and spinal cord. Nerves are a foundational part of the nervous system and are like cables that carry electrical impulses between the brain and the rest of the body. These electrical signals help us feel sensations and move our muscles.
Non-myelinated nerve fibres, or C-fibers, are an important group of nerve fibres that exist throughout the peripheral nervous system. These fibres are involved in the afferent transfer of temperature, burning pain, and itch from the periphery to the synapse. Schwann cells surround groups of unmyelinated C-fibers, creating an ultrastructure in which C-fibers are bound together. These so-called Remak bundles vary in size and distribution between different anatomical sites.
The relative composition of myelinated and non-myelinated fibres varies from one anatomical site to another. Both types of fibres are supported by Schwann cells, which are a type of supporting glial cell of the peripheral nervous system. Schwann cells develop from the neural crest and are able to produce a lipid-rich layer around peripheral nerve fibres called the myelin sheath.
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Nerve conditions and neuropathies can cause muscle palsies
Nerves are like cables that carry electrical impulses between the brain and the rest of the body. They are a foundational part of the nervous system. Motor nerves, for instance, control voluntary muscle movement.
Neuropathies are nerve disorders that can affect the peripheral nerves, which branch throughout the body, extending to the fingers and toes. They carry sensory data, instructions, and other messages to and from the central nervous system. Peripheral neuropathies can weaken muscles or limit sensation in the arms, hands, legs, or feet. They can also affect other areas of the body and bodily functions, including digestion and blood pressure control.
There are over 100 types of peripheral neuropathy, each with its own causes and symptoms. Some of the nerve conditions and neuropathies that can cause muscle palsies include:
- Guillain-Barré syndrome: This is an autoimmune neuropathy where the body's immune system attacks nerves, often after an infection. It causes weakness or a change in sensation in limbs and can progress to paralysing the entire body.
- Hereditary neuropathy with liability to pressure palsies (HNPP): HNPP is a rare condition that occurs when one copy of the PMP22 gene is missing. This gene makes a protein that is a key part of myelin, the nerve sheath. People with HNPP are extremely sensitive to physical pressure.
- HIV-related neuropathy: The human immunodeficiency virus (HIV) and medications used to treat HIV/AIDS can damage nerves. About one-third of people with HIV also have HIV-related neuropathy.
- Carpal tunnel syndrome: This is an overuse injury that can lead to peripheral neuropathy.
- Bell's palsy: This condition results from damage to the facial nerve (the 7th cranial nerve) and causes facial muscle weakness or paralysis. It can be caused by inflammation directed by the body's immune system against the nerve controlling facial movement.
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Nerve fibres are surrounded by a low-protein liquid called endoneurial fluid
Nerves are like cables that carry electrical impulses between the brain and the rest of the body. They are present throughout the human body and are a foundational part of the nervous system. Nerve cells are also called neurons. Each nerve is covered on the outside by a dense sheath of connective tissue called the epineurium.
Beneath the epineurium is a layer of fat cells, the perineurium, which forms a complete sleeve around a bundle of axons. Perineurial septae extend into the nerve and subdivide it into several bundles of fibres. Surrounding each such fibre is the endoneurium, which contains a liquid known as endoneurial fluid.
The endoneurium has properties analogous to the blood-brain barrier. It prevents certain molecules from crossing from the blood into the endoneurial fluid. In this respect, endoneurial fluid is similar to cerebrospinal fluid in the central nervous system. During nerve irritation or injury, the amount of endoneurial fluid may increase at the site of damage. This increase in fluid can be visualized using magnetic resonance neurography to diagnose nerve damage.
The endoneurium runs longitudinally along the nerve fibre, but with discontinuities where septa pass inward from the innermost layer of the perineurium. It contains fine bundles of fibrous connective tissue, primarily collagen, embedded in a matrix of ground substance. This structure serves to support capillary blood vessels, arranged so as to form a network of elongated meshes.
Thus, nerve fibres are surrounded by a low-protein liquid called endoneurial fluid.
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Frequently asked questions
Nerves are enclosed, cable-like bundles of nerve fibers, also called axons, in the peripheral nervous system. They do not contain muscle fiber. However, nerves are often bundled with blood vessels and muscles.
Nerve fibers contain neurofibrils, microtubules, and Schwann cells.
There are two main types of nerve fibers: sensory nerve fibers and motor nerve fibers. Sensory nerve fibers carry signals to the brain to help with touch, taste, smell, and sight. Motor nerve fibers carry signals to muscles or glands to help with movement and function.
Nerves send electrical signals that help with sensation and movement of muscles. They also control body functions like digestion, heart rate, and maintaining stress responses.
