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Encyclopedia > Afferent nerve
The mechanism of the reflex arc

In the nervous system, afferent neurons--otherwise known as sensory or receptor neurons--carry nerve impulses from receptors or sense organs toward the central nervous system. This is the case vice versa as well. This term can also be used to describe relative connections between structures. Afferent neurons communicate with specialized interneurons. (The opposite activity of direction or flow is efferent.) Image File history File links ReflexArc1. ... Image File history File links ReflexArc1. ... A reflex arc is the neural pathway mediating a reflex. ... The Human Nervous System. ... The mechanism of the reflex arc Sensory neurons (neurones) are nerve cells within the nervous system responsible for converting external stimuli from the organisms environment into internal electrical motor reflex loops and several forms of involuntary behavior, including pain avoidance. ... Drawing by Santiago Ramón y Cajal of neurons in the pigeon cerebellum. ... A. A schematic view of an idealized action potential illustrates its various phases as the action potential passes a point on a cell membrane. ... In biochemistry, a receptor is a protein on the cell membrane or within the cytoplasm or cell nucleus that binds to a specific molecule (a ligand), such as a neurotransmitter, hormone, or other substance, and initiates the cellular response to the ligand. ... A diagram showing the CNS: 1. ... An interneuron (also called relay neuron,association neuron or bipolar neuron) is a term used to describe a neuron which has two different common meanings. ... In the nervous system, efferent nerves otherwise known as motor or effector neuron carry nerve impulses away from the central nervous systemto effectors - either muscles or glands. ...


In the nervous system there is a "closed loop" system of sensation, decision, and reactions. This process is carried out through the activity of afferent neurons, interneurons, and efferent neurons.


A touch or painful stimulus, for example, creates a sensation in the brain only after information about the stimulus travels there via afferent nerve pathways. Afferent neurons are pseudounipolar neurons, that have a single long dendrite and a short axon, and a smooth and rounded cell body. The dendrite is structurally and functionally similar to an axon, and is myelinated; it is these axon-like dendrites that make up the afferent nerves. Just outside the spinal cord, thousands of afferent neuronal cell bodies are aggregated in a swelling in the dorsal root known as the dorsal root ganglion. (See efferent nerve.) “Hurting” redirects here. ... In physiology, a stimulus is a detectable change in the internal or external environment. ... It has been suggested that this article or section be merged with Sensation and perception psychology. ... A pseudounipolar neuron (pseudo - false, uni - one) is a sensory neuron in the peripheral nervous system. ... Dendrites (from Greek dendron, “tree”) are the branched projections of a neuron that act to conduct the electrical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. ... An axon or nerve fiber, is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neurons cell body or soma. ... The soma, or perikaryon, is the bulbous end of a neuron, containing the cell nucleus. ... Myelin is an electrically insulating phospholipid layer that surrounds the axons of many neurons. ... The Spinal cord nested in the vertebral column. ... penis ... This is a dorsal root ganglion (DRG) from a chicken embryo (around stage of day 7) after incubation overnight in NGF growth medium stained with anti-neurofilament antibody. ... In the nervous system, efferent nerves otherwise known as motor or effector neuron carry nerve impulses away from the central nervous systemto effectors - either muscles or glands. ...


Etymology and mnemonics

Both afferent and efferent come from French, as evolution from Latin (much used in medicine and biology) of respectively ad ferentes (latin verb fero : I carry), meaning carrying into, and ex ferentes, meaning carrying away. Ad and ex give an easy mnemonic device for remembering the relationship between afferent and efferent : afferent connection arrives and an efferent connection exits.[1] For other uses, see Latin (disambiguation). ... A mnemonic (AmE [] or BrE []) is a memory aid. ...


References

  1. ^ Mnemonic at medicalmnemonics.com 3502 3463 367 115

For other uses, see Mnemonic (disambiguation). ...

External links


  Results from FactBites:
 
Nerve - Wikipedia, the free encyclopedia (496 words)
A nerve is an enclosed, cable-like bundle of axons (the long, slender projection of a neuron).
Afferent nerves convey sensory signals to the central nervous system, for example from skin or organs, while efferent nerves conduct stimulatory signals from the central nervous system to the muscles and glands.
Nerve damage or pinched nerves are usually accompanied by pain, numbness, weakness, or paralysis.
Afferent nerve - Wikipedia, the free encyclopedia (210 words)
In the nervous system, afferent neurons--otherwise known as sensory or receptor neurons--carry nerve impulses from receptors or sense organs toward the central nervous system.
The structure of an afferent neuron contains a single long dendrite and a short axon; the shape of the cell body of an afferent neuron is smooth and rounded.
Just outside the spinal cord, thousands of afferent neuronal cell bodies are aggregated in a swelling in the dorsal root known as the dorsal root ganglion.
  More results at FactBites »

 
 

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