NDLI: Association fibers connecting the Broca center and the lateral superior frontal gyrus: a microsurgical and tractographic anatomy.

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Association fibers connecting the Broca center and the lateral superior frontal gyrus: a microsurgical and tractographic anatomy.

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Association fibers connecting the Broca center and the lateral superior frontal gyrus: a microsurgical and tractographic anatomy.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kinoshita, Masashi Shinohara, Harumichi Hori, Osamu Ozaki, Noriyuki Ueda, Fumiaki Nakada, Mitsutoshi Hamada, Jun-Ichiro Hayashi, Yutaka
Description	Country affiliation: Japan Author Affiliation: Kinoshita M ( Departments of Neurosurgery, Kanazawa University, Kanazawa, Japan.)
Abstract	OBJECT: Recently, intraoperative mapping has disclosed that, in addition to the classic language centers (that is, the Broca and Wernicke centers), other cortical regions may also play an important role in language organization. In the prefrontal cortex, although the lateral superior frontal gyrus (LSFG) could have language-related functions, there are no detailed reports that demonstrate the anatomical connection between the LSFG and other well-known language cortices, such as the Broca center. To show the existence of the structural connection, white matter association fibers between the inferior frontal gyrus (IFG) and the LSFG were examined using fiber dissection (FD) and diffusion tensor (DT) imaging-based tractography. METHODS: Eight cadaveric cerebral hemispheres were dissected to reveal the association fibers between the IFG and LSFG. The DT imaging-based tractography studies targeting the prefrontal cortex were obtained in 53 right-handed patients who had no organic cerebral lesions. RESULTS: The association fiber tract between Brodmann area 44/45 (the Broca center in the dominant hemisphere) and LSFG were detected in all specimens by FD. In the DT imaging-based tractography studies, the tract was identified in all patients bilaterally, except for the 4 in whom the tract was detected only in the left hemisphere. This tract was spread significantly wider in the left than in the right hemisphere, and left lateralization was evident in male patients. CONCLUSIONS: Based on its character, this tract was named the Broca-LSFG pathway. These findings suggest a close relationship between this pathway and language organization. The structural anatomy of the Broca-LSFG pathway may explain speech disturbances induced by LSFG stimulation that are sometimes observed during intraoperative language mapping.
File Format	HTM / HTML
ISSN	00223085
e-ISSN	19330693
Journal	Journal of Neurosurgery
Issue Number	2
Volume Number	116
Language	English
Publisher	American Association of Neurological Surgeons
Publisher Date	2012-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Neurosurgery Brain Mapping Diffusion Tensor Imaging Frontal Lobe Cytology Neural Pathways Prefrontal Cortex Cadaver Dissection Dominance, Cerebral Microsurgery Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Neurology (clinical) Surgery

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