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Cervical nerve roots and the dural sheath: a histological study using human fetuses near term
We have previously reported that the thoracolumbar posterior nerve root shows a tortuous epidural course, based on studies of human fetuses near term. For comparison with the cervical nerve, examinations were conducted using frontal, sagittal and horizontal sections of cervical vertebrae from 22 fet...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Korean Association of Anatomists
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7769102/ https://www.ncbi.nlm.nih.gov/pubmed/33012725 http://dx.doi.org/10.5115/acb.20.081 |
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author | Kitamura, Kei Yamamoto, Masahito Hirota, Yoshinosuke Sato, Noriyuki Machida, Toshimasa Ishikawa, Noboru Yamamoto, Hitoshi Murakami, Gen Abe, Shinichi |
author_facet | Kitamura, Kei Yamamoto, Masahito Hirota, Yoshinosuke Sato, Noriyuki Machida, Toshimasa Ishikawa, Noboru Yamamoto, Hitoshi Murakami, Gen Abe, Shinichi |
author_sort | Kitamura, Kei |
collection | PubMed |
description | We have previously reported that the thoracolumbar posterior nerve root shows a tortuous epidural course, based on studies of human fetuses near term. For comparison with the cervical nerve, examinations were conducted using frontal, sagittal and horizontal sections of cervical vertebrae from 22 fetuses at 30–38 weeks of gestation. The cervical nerve root showed a short, straight and lateral course near the zygapophysial joint. Multiple rather than single bundles of the cervical posterior root seemed to account for the majority of sensory nerve fibers innervating the upper extremity. Fasciculation of rootlets was evident near the thoracolumbar spinal cord, whereas it was seen in the dural pocket at the nerve exit from the dural sac although both sites were subdural. As in the thoracolumbar region, the nerve sheath was continuous with the dura mater and independently surrounded each of the anterior and posterior roots. Radicular arteries were few in the cervical region. In 2 of the 22 fetuses (31 weeks and 33 weeks), there was a segmental, unilateral abnormality of nerve rootlet fasciculation where the dorsal root ganglion was located lateral or peripheral to the intervertebral region. Long nerve roots running inferiorly are a necessary adaptation to the delayed and marked growth of the thoracolumbar vertebral column. In children, the cervical nerve roots are likely to be affected by movement or dislocation of the vertebrae. The segmental abnormality of the cervical nerve root may be linked to rare variations in the brachial plexus. |
format | Online Article Text |
id | pubmed-7769102 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Korean Association of Anatomists |
record_format | MEDLINE/PubMed |
spelling | pubmed-77691022021-01-05 Cervical nerve roots and the dural sheath: a histological study using human fetuses near term Kitamura, Kei Yamamoto, Masahito Hirota, Yoshinosuke Sato, Noriyuki Machida, Toshimasa Ishikawa, Noboru Yamamoto, Hitoshi Murakami, Gen Abe, Shinichi Anat Cell Biol Original Article We have previously reported that the thoracolumbar posterior nerve root shows a tortuous epidural course, based on studies of human fetuses near term. For comparison with the cervical nerve, examinations were conducted using frontal, sagittal and horizontal sections of cervical vertebrae from 22 fetuses at 30–38 weeks of gestation. The cervical nerve root showed a short, straight and lateral course near the zygapophysial joint. Multiple rather than single bundles of the cervical posterior root seemed to account for the majority of sensory nerve fibers innervating the upper extremity. Fasciculation of rootlets was evident near the thoracolumbar spinal cord, whereas it was seen in the dural pocket at the nerve exit from the dural sac although both sites were subdural. As in the thoracolumbar region, the nerve sheath was continuous with the dura mater and independently surrounded each of the anterior and posterior roots. Radicular arteries were few in the cervical region. In 2 of the 22 fetuses (31 weeks and 33 weeks), there was a segmental, unilateral abnormality of nerve rootlet fasciculation where the dorsal root ganglion was located lateral or peripheral to the intervertebral region. Long nerve roots running inferiorly are a necessary adaptation to the delayed and marked growth of the thoracolumbar vertebral column. In children, the cervical nerve roots are likely to be affected by movement or dislocation of the vertebrae. The segmental abnormality of the cervical nerve root may be linked to rare variations in the brachial plexus. Korean Association of Anatomists 2020-12-31 2020-12-31 /pmc/articles/PMC7769102/ /pubmed/33012725 http://dx.doi.org/10.5115/acb.20.081 Text en Copyright © 2020. Anatomy & Cell Biology This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Kitamura, Kei Yamamoto, Masahito Hirota, Yoshinosuke Sato, Noriyuki Machida, Toshimasa Ishikawa, Noboru Yamamoto, Hitoshi Murakami, Gen Abe, Shinichi Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title | Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title_full | Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title_fullStr | Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title_full_unstemmed | Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title_short | Cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
title_sort | cervical nerve roots and the dural sheath: a histological study using human fetuses near term |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7769102/ https://www.ncbi.nlm.nih.gov/pubmed/33012725 http://dx.doi.org/10.5115/acb.20.081 |
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