WordNet

any bundle of nerve fibers running to various organs and tissues of the body (同)nervus
of nerves and nerve impulses; conveying information away from the CNS; "efferent nerves and impulses" (同)motorial
control of your emotions; "this kind of tension is not good for my nerves"

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〈C〉『神経』 / 〈C〉《複数形で》『神経過敏』,いらだち / 〈U〉『勇気』,度胸(courage) / 〈U〉《時にa ~》厚かましさ,ずぶとさ;無礼 / 〈C〉葉脈;(昆虫の)翅脈(しみゃく) / 〈人,特に自分〉‘に'力を与える,‘を'元気づける
(血管・導管が)輸出性の,導出性の;(神経が)遠心性の

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/08/16 10:10:03」(JST)

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In the nervous system, efferent nerves, otherwise known as motor or effector neurons, carry nerve impulses away from the central nervous system to effectors such as muscles or glands (and also the ciliated cells of the inner ear). The term can also be used to describe relative connections between nervous structures (for example, a neuron's efferent synapse provides input to another neuron, and not vice-versa). The opposite activity of direction or flow is afferent.

The motor nerves are efferent nerves involved in muscular control. The cell body of the efferent neuron is connected to a single, long axon and several shorter dendrites projecting out of the cell body itself. This axon then forms a neuromuscular junction with the effectors. The cell body of the motor neuron is satellite-shaped. The motor neuron is present in the grey matter of the spinal cord and medulla oblongata, and forms an electrochemical pathway to the effector organ or muscle. Besides motor nerves, there are efferent sensory nerves that often serve to adjust the sensitivity of the signal relayed by the afferent sensory nerve.

Etymology and mnemonics

Both afferent and efferent come from French, evolved from Latin (the basis of many terms in medicine and biology) for the terms, respectively, ad ferens (Latin verb ferre: carry), meaning carrying into, and ex ferens, 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]

References

^ Mnemonic at medicalmnemonics.com 3502 3463 367 115

External links

Motor neurons, a dynamic list of Petilla convention aligned motor neurons at NeuroLex.
Efferent+nerve at eMedicine Dictionary

This neuroscience article is a stub. You can help Wikipedia by expanding it.

UpToDate Contents

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1. 神経伝導検査の概要 overview of nerve conduction studies
2. 成人における第三脳神経（動眼神経）麻痺 third cranial nerve oculomotor nerve palsy in adults
3. 下肢末梢神経症候群の概要 overview of lower extremity peripheral nerve syndromes
4. 気道の神経制御 neuronal control of the airways
5. 上肢末梢神経症候群の概要 overview of upper extremity peripheral nerve syndromes

English Journal

Efferent connections of the parvalbumin-positive (PV1) nucleus in the lateral hypothalamus of rodents.

Celio MR, Babalian A, Ha QH, Eichenberger S, Clément L, Marti C, Saper CB.SourceAnatomy Unit, Department of Medicine and Program in Neuroscience, University of Fribourg, CH-1700, Fribourg, Switzerland; Department of Neurology and Program in Neuroscience, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Massachusetts, 02215.
The Journal of comparative neurology.J Comp Neurol.2013 Oct 1;521(14):Spc1. doi: 10.1002/cne.23402.
A solitary cluster of parvalbumin-positive neurons - the PV1 nucleus - has been observed in the lateral hypothalamus of rodents. In the present study, we mapped the efferent connections of the PV1 nucleus using nonspecific antero- and retrograde tracers in rats, and chemoselective, Cre-dependent vir
PMID 23893843

Efferent connections of the parvalbumin-positive (PV1) nucleus in the lateral hypothalamus of rodents.

Celio MR, Babalian A, Ha QH, Eichenberger S, Clément L, Marti C, Saper CB.SourceAnatomy Unit, Department of Medicine and Program in Neuroscience, University of Fribourg, CH-1700, Fribourg, Switzerland; Department of Neurology and Program in Neuroscience, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Massachusetts, 02215.
The Journal of comparative neurology.J Comp Neurol.2013 Oct 1;521(14):3133-53. doi: 10.1002/cne.23344.
A solitary cluster of parvalbumin-positive neurons - the PV1 nucleus - has been observed in the lateral hypothalamus of rodents. In the present study, we mapped the efferent connections of the PV1 nucleus using nonspecific antero- and retrograde tracers in rats, and chemoselective, Cre-dependent vir
PMID 23787784

Renal denervation for arrhythmias: hope or hype?

Steinberg JS, Pokushalov E, Mittal S.SourceArrhythmia Institute, Valley Health System, Columbia University College of Physicians & Surgeons, New York, NY, USA, jss7@columbia.edu.
Current cardiology reports.Curr Cardiol Rep.2013 Sep;15(9):392. doi: 10.1007/s11886-013-0392-0.
Renal artery denervation (RDN) has been introduced as an ablation procedure that can effectively treat drug-resistant forms of hypertension. The ablative lesions reduce the afferent and efferent sympathetic nerve traffic to and from the kidneys, thus improving blood pressure control. Because of bett
PMID 23881576