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Internal arcuate fibers
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Internal arcuate fibers : ウィキペディア英語版
Internal arcuate fibers

The internal arcuate fibers are the axons of second-order neurons that are contained within the gracile and cuneate nuclei of the medulla oblongata. When these second-order neurons have contact with axons from the first-order neurons in the dorsal root ganglia they send out axons to the thalamus. These axons decussate (cross over) from one side of the medulla to the other when they are then known as the internal arcuate fibers. The decussation is also known as the sensory decussation and this forms the medial lemniscus.
The internal arcuate fibers are part of the second-order neurons of the posterior column-medial lemniscus system, and are important for relaying the sensation of fine touch and proprioception to the thalamus and ultimately to the cerebral cortex.
==External links==

*
* (Photo ) at Indiana.edu


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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