関: conducting pathway、neural interconnection

WordNet

of or relating to neurons; "neural network" (同)neuronal, neuronic
a trodden path (同)footpath

PrepTutorEJDIC

神経[系統]の
道,小道(path)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/02/10 19:31:30」(JST)

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A neural pathway, neural tract, or neural face, connects one part of the nervous system with another via a bundle of axons, the long fibers of neurons. A neural pathway that serves to connect relatively distant areas of the brain or nervous system is usually a bundle of neurons, known collectively as white matter. A neural pathway that spans a shorter distance between structures, such as most of the pathways of the major neurotransmitter systems, is usually called grey matter.

Naming of neural pathways

The first named pathways are evident to the naked eye even in a poorly preserved brain, and were named by the great anatomists of the Renaissance using cadaver material. Examples of these include the great commissures of the brain such as the corpus callosum (Latin, "hard body"; not to be confused with the Latin word "colossus" - the "huge" statue), anterior commissure, and posterior commissure. Further examples of this (by no means a complete list) include the pyramidal tract, crus cerebri (Latin, "leg of the brain"), and cerebellar peduncles (Latin, "little foot of the cerebellum"). Note that these names describe the appearance of a structure but give one no information on its function or location.

Later, as neuroanatomical knowledge became more sophisticated, the trend was toward naming pathways by their origin and termination. For example, the nigrostriatal pathway, which is degenerated in Parkinson's disease, runs from the substantia nigra (Latin, "black substance") to the corpus striatum (Latin, "striped body"). This naming can extend to include any number of structures in a pathway, such that the cerebellorubrothalamocortical pathway originates in the cerebellum, synapses in the red nucleus ("ruber" in Latin), on to the thalamus, and finally terminating in the cerebral cortex.

Sometimes, these two naming conventions coexist. For example, the name "pyramidal tract" has been mainly supplanted by lateral corticospinal tract in most texts. Note that the "old" name was primarily descriptive, evoking the pyramids of antiquity, from the appearance of this neural pathway in the medulla oblongata. The "new" name is based primarily on its origin (in the primary motor cortex, Brodmann area 4) and termination (onto the alpha motor neurons of the spinal cord).

Functional aspects

In general, neurons receive information either at their dendrites or cell bodies. The axon of a nerve cell is, in general, responsible for transmitting information over a relatively long distance. Therefore, most neural pathways are made up of axons. the pathway will appear a darker beige color, which is generally called grey (British English, or gray in American English).

Some neurons are responsible for conveying information over long distances. For example, motor neurons, which travel from the spinal cord to the muscle, can have axons up to a meter in length in humans; the longest axon in the human body is almost two meters long in tall individuals and runs from the great toe to the medulla oblongata of the brainstem. These are archetypical examples of neural pathways.

Major neural pathways

Arcuate fasciculus
Cerebral peduncle
Corpus callosum
Pyramidal or corticospinal tract

Dopamine pathways:

Mesocortical pathway
Mesolimbic pathway.
Nigrostriatal pathway
Tuberoinfundibular pathway

References

Haines DE. Neuroanatomy: An Atlas of Structures, Sections, and Systems ISBN 0-7817-3736-2.

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English Journal

Tracing the emergence of categorical speech perception in the human auditory system.

Bidelman GM, Moreno S, Alain C.SourceInstitute for Intelligent Systems, University of Memphis, Memphis, TN 38105, USA; School of Communication Sciences & Disorders, University of Memphis, Memphis, TN 38105, USA. Electronic address: g.bidelman@memphis.edu.
NeuroImage.Neuroimage.2013 Oct;79:201-12. doi: 10.1016/j.neuroimage.2013.04.093. Epub 2013 May 3.
Speech perception requires the effortless mapping from smooth, seemingly continuous changes in sound features into discrete perceptual units, a conversion exemplified in the phenomenon of categorical perception. Explaining how/when the human brain performs this acoustic-phonetic transformation remai
PMID 23648960

Competing physiological pathways link individual differences in weight and abdominal adiposity to white matter microstructure.

Verstynen TD, Weinstein A, Erickson KI, Sheu LK, Marsland AL, Gianaros PJ.SourceDepartment of Psychology, Carnegie Mellon University, USA; Center for the Neural Basis of Cognition, Carnegie Mellon University, USA. Electronic address: timothyv@andrew.cmu.edu.
NeuroImage.Neuroimage.2013 Oct;79:129-37. doi: 10.1016/j.neuroimage.2013.04.075. Epub 2013 Apr 29.
Being overweight or obese is associated with reduced white matter integrity throughout the brain. It is not yet clear which physiological systems mediate the association between inter-individual variation in adiposity and white matter. We tested whether composite indicators of cardiovascular, lipid,
PMID 23639257

Consequences of polar form coherence for fMRI responses in human visual cortex.

Mannion DJ, Kersten DJ, Olman CA.SourceDepartment of Psychology, University of Minnesota, Minneapolis, MN, USA. Electronic address: dmannion@umn.edu.
NeuroImage.Neuroimage.2013 Sep;78:152-8. doi: 10.1016/j.neuroimage.2013.04.036. Epub 2013 Apr 19.
Relevant features in the visual image are often spatially extensive and have complex orientation structure. Our perceptual sensitivity to such spatial form is demonstrated by polar Glass patterns, in which an array of randomly-positioned dot pairs that are each aligned with a particular polar displa
PMID 23608060