what are nerves
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Medical Definition of Nerve Medical Definition of Nerve Nerve: A bundle of fibers that uses electrical and chemical signals to transmit sensory and motor information from one body part to another. The fibrous portions of a nerve are covered by a sheath called myelin and/or a membrane called neurilemma. (Note that entries for specific nerves can be found under the names of the particular nerves. For example, the optic nerve is not under 'nerve, optic' but rather under 'optic nerve.')
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Cranial nerves Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). Cranial nerves exchange information between the brain and parts of the body, primarily to and from regions of the head and neck.ranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). Cranial nerves exchange information between the brain and parts of the body, primarily to and from regions of the head and neck.
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nerve n. 1  1. Any of the cordlike bundles of fibers made up of neurons through which sensory stimuli and motor impulses pass between the brain or other parts of the central nervous system and the eyes, glands, muscles, and other parts of the body. Nerves form a network of pathways for conducting information throughout the body.
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- Nerves. Nerves are bundles of axons in the peripheral nervous system (PNS) that act as information highways to carry signals between the brain and spinal cord and the rest of the body. Each axon is wrapped in a connective tissue sheath called the endoneurium.erves. Nerves are bundles of axons in the peripheral nervous system (PNS) that act as information highways to carry signals between the brain and spinal cord and the rest of the body. Each axon is wrapped in a connective tissue sheath called the endoneurium.
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nerve sensory nerve a peripheral nerve that conducts impulses from a sense organ to the spinal cord or brain. See also neuron. somatic n's the sensory and motor nerves supplying skeletal muscle and somatic tissues.
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Cranial nerves Cranial Nerves. Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head and neck.
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- Spinal Nerves. Nerves called the spinal nerves or nerve roots, branch off the spinal cord and pass out through a hole in each of the vertebrae called the foramen. These nerves carry information from the spinal cord to the rest of the body, and from the body back up to the brain.he nerves which exit the spinal cord in the mid and lower section of the back, control the trunk and legs, as well as bladder, bowel and sexual function. The nerves which carry information from the brain to muscles are called motor neurones.
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Nervous System: Facts, Function & Diseases The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.It is essentially the body’s electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system.he peripheral nervous system consists of sensory neurons, ganglia (clusters of neurons) and nerves that connect to one another and to the central nervous system. Functionally, the nervous system has two main subdivisions: the somatic, or voluntary, component; and the autonomic, or involuntary, component.
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Nervous System Nerves. Nerves are bundles of axons in the peripheral nervous system (PNS) that act as information highways to carry signals between the brain and spinal cord and the rest of the body. Each axon is wrapped in a connective tissue sheath called the endoneurium. Sensory. 2  The sensory function of the nervous system involves collecting information from sensory receptors that monitor the body’s internal and external conditions. 3  These signals are then passed on to the central nervous system (CNS) for further processing by afferent neurons (and nerves).
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Peripheral Nerve System “Peripheral nerve” is a term used synonymously to describe the peripheral nervous system. The peripheral nervous system is a network of 43 pairs of motor and sensory nerves that connect the brain and spinal cord (the central nervous system) to the entire human body.he peripheral nervous system is a network of 43 pairs of motor and sensory nerves that connect the brain and spinal cord (the central nervous system) to the entire human body.
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- A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine.
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What are Spinal Nerves Spinal nerves are the nerves that originate in the spinal cord and form part of peripheral nervous system. Spinal nerves are mixed types of nerves. A mixed nerve is one which transmits motor, sensory, and autonomic signals between the spinal cord and the body.In humans, there are 31 of spinal nerves on each side of the vertebral column making it 31 pairs in total.ach spinal nerve is formed by combination of anterior and posterior roots for that particular spinal segment. The posterior or dorsal root is the sensory root of a spinal nerve and anterior or ventral root is motor nerve.
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Cranial Nerves Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord).Cranial nerves exchange information between the brain and parts of the body, primarily to and from regions of the head and neck.pinal nerves emerge sequentially from the spinal cord with the spinal nerve closest to the head (C1) emerging in the space above the first cervical vertebra. The cranial nerves emerge from the central nervous system above this level.
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How Nerves Work The brain is the center of the nervous system, like the microprocessor in a computer. The spinal cord and nerves are the connections, like the gates and wires in the computer. Nerves carry electrochemical signals to and from different areas of the nervous system as well as between the nervous system and other tissues and organs. Nerves are divided into four classes: Cranial nerves connect your sense organs (eyes, ears, nose, mouth) to your brain
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Spinal nerve A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine. There are eight pairs of cervical nerves, twelve pairs of thoracic nerves, five pairs of lumbar nerves, five pairs of sacral nerves, and one pair of coccygeal nerves. The spinal nerves are part of the peripheral nervous system.
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Spinal Cord Anatomy A spinal nerve is any of the 31 pairs of nerves that arise from the spinal cord. The spinal nerves correspond to where it emerges and passes through the spinal vertebrae: there are 8 cervical (neck), 12 thoracic (chest), 5 lumbar (lower back), 5 sacral (sacrum bone) and one coccygeal (tailbone) nerve(s).
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Nervous System: Facts, Function & Diseases The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body. It is essentially the body's electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system.
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Nervous System: Facts, Function & Diseases The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body.It is essentially the body’s electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system.he nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body. It is essentially the body’s electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system.
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nerve endings Depending on their function, nerves are known as sensory, motor or mixed. Sensory nerves, or afferent nerves, carry information from the periphery of the body to the brain and spinal cord. Sensations of heat, cold, pressure and pain are conveyed by the sensory nerves.
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Medical Terminology for Cancer Nerves, Neuroglia, and Ganglia. A nerve is a bundle of fibres (axons and/or dendrites) outside the CNS. Neuroglia are cells of the nervous system that help protect and support it. Ganglia are groups of nerve cell bodies lying outside the CNS.
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What is the function of the nerve? Basically, a nerve is a fiber that connects the brain and spinal cord with various parts of the body (aka-receptor organs). Nerves conduct impulses from the brain/spinal cord to these receptor organs as well as conducting impulses from the receptor organs back to the brain/spinal cord.he function of the nerve is to send information to the brain. Answer By:Farman Ali Your nerves are one of the four types of tissues in your body; skin, muscle, connective tis … sue, and nerves.
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nerve 1. a nerve that lessens the activity of an organ. 2. an afferent nerve whose stimulation causes a fall in blood pressure. efferent nerve any nerve that carries impulses from the central nervous system toward the periphery, such as a motor nerve. See also neuron.
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Hernia The above article deals mostly with visceral hernias, where the herniating tissue arises within the abdominal cavity. Other hernia types and unusual types of visceral hernias are listed below, in alphabetical order: Abdominal wall hernias: Umbilical hernia; Epigastric hernia: a hernia through the linea alba above the umbilicus.