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arcuate_fasciculus [2019/12/11 16:49]
arcuate_fasciculus [2021/04/22 08:44]
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 +=====Arcuate fasciculus=====
 +see [[Arcuate fasciculus resection]].
 +{{ ::arcuate_fasciculus.jpg?400|}}
 +The arcuate fasciculus (Latin, curved bundle) is a bundle of [[axon]]s that forms part of the [[superior longitudinal fasciculus]]. The arcuate bidirectionally connects caudal temporal cortex and inferior parietal cortex to locations in the [[frontal lobe]].
 +The aim of a study was to examine the arcuate (AF) and [[superior longitudinal fasciculi]] (SLF), which together form the dorsal language stream, using fiber dissection and diffusion imaging techniques in the human brain. 
 +Twenty-five formalin-fixed brains (50 hemispheres) and 3 adult cadaveric heads, prepared according to the [[Klingler method]], were examined by the fiber dissection technique. The authors' findings were supported with MR [[tractography]] provided by the [[Human Connectome Project]], WU-Minn Consortium. The frequencies of gyral distributions were calculated in segments of the AF and SLF in the cadaveric specimens. 
 +The AF has ventral and dorsal segments, and the SLF has 3 segments: SLF I (dorsal pathway), II (middle pathway), and III (ventral pathway). The AF ventral segment connects the middle (88%; all percentages represent the area of the named structure that is connected to the tract) and posterior (100%) parts of the superior temporal gyri and the middle part (92%) of the middle temporal gyrus to the posterior part of the inferior frontal gyrus (96% in pars opercularis, 40% in pars triangularis) and the ventral premotor cortex (84%) by passing deep to the lower part of the supramarginal gyrus (100%). The AF dorsal segment connects the posterior part of the middle (100%) and inferior temporal gyri (76%) to the posterior part of the inferior frontal gyrus (96% in pars opercularis), ventral premotor cortex (72%), and posterior part of the middle frontal gyrus (56%) by passing deep to the lower part of the angular gyrus (100%). 
 +This study depicts the distinct subdivision of the AF and SLF, based on cadaveric fiber dissection and diffusion imaging techniques, to clarify the complicated language processing pathways
 +((Yagmurlu K, Middlebrooks EH, Tanriover N, Rhoton AL Jr. Fiber tracts of the
 +dorsal language stream in the human brain. J Neurosurg. 2015 Nov 20:1-10. [Epub
 +ahead of print] PubMed PMID: 26587654.
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