A temporary disc-like structure at the median atlanto-axial joint in human fetuses

During observations of mid-term and late-stage fetuses, we found a joint disk-like structure at the anterior component of the median atlanto-axial joint. At mid-term, the disk-like structure was thick (0.1–0.15 mm) relative to the sizes of bones surrounding the joint. However, it did not completely...

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Detalhes bibliográficos
Autores: Sakanaka, Koichiro, Yamamoto, Masahito, Hirouchi, Hidetomo, Kim, Ji Hyun, Murakami, Gen, Rodríguez Vázquez, José Francisco, Abe, Shinichi
Tipo de documento: artigo
Data de publicação:2019
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositório:Docta Complutense
Idioma:inglês
OAI Identifier:oai:docta.ucm.es:20.500.14352/109136
Acesso em linha:https://hdl.handle.net/20.500.14352/109136
Access Level:Acceso aberto
Palavra-chave:611.013
Disk
Human fetuses
Median atlanto-axial joint
Meniscoid
Anatomía
2410.02 Anatomía Humana
2410.06 Embriología Humana
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oai_identifier_str oai:docta.ucm.es:20.500.14352/109136
network_acronym_str ES
network_name_str España
repository_id_str
spelling A temporary disc-like structure at the median atlanto-axial joint in human fetusesSakanaka, KoichiroYamamoto, MasahitoHirouchi, HidetomoKim, Ji HyunMurakami, GenRodríguez Vázquez, José FranciscoAbe, Shinichi611.013DiskHuman fetusesMedian atlanto-axial jointMeniscoidAnatomía2410.02 Anatomía Humana2410.06 Embriología HumanaDuring observations of mid-term and late-stage fetuses, we found a joint disk-like structure at the anterior component of the median atlanto-axial joint. At mid-term, the disk-like structure was thick (0.1–0.15 mm) relative to the sizes of bones surrounding the joint. However, it did not completely separate the joint cavity, and was absent in the inferior and/or central part of the cavity. This morphology was similar to the so-called fibroadipose meniscoid of the lumbar zygapophysial joint that is usually seen in adults. In mid-term fetuses, there was evidence suggesting that a mesenchymal tissue plate was separated from a roof of the joint cavity. In late-stage fetuses, the thickness (less than 0.15 mm) was usually the same as, or less than that at mid-term, and the disk-like structure was often flexed, folded and fragmented. Therefore, in contrast to the zygapophysial meniscoid as a result of aging, the present disk-like structure was most likely a temporary product during the cavitation process. It seemed to be degenerated in late-stage fetuses and possibly also in newborns. Anomalies at the craniocervical junction such as Chiari malformations might accompany this disk-like structure at the median atlanto-axial joint even in childhood.Korean Association of AnatomistsUniversidad Complutense de Madrid20192019-01-0120192019-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/109136reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1091362026-06-02T12:44:21Z
dc.title.none.fl_str_mv A temporary disc-like structure at the median atlanto-axial joint in human fetuses
title A temporary disc-like structure at the median atlanto-axial joint in human fetuses
spellingShingle A temporary disc-like structure at the median atlanto-axial joint in human fetuses
Sakanaka, Koichiro
611.013
Disk
Human fetuses
Median atlanto-axial joint
Meniscoid
Anatomía
2410.02 Anatomía Humana
2410.06 Embriología Humana
title_short A temporary disc-like structure at the median atlanto-axial joint in human fetuses
title_full A temporary disc-like structure at the median atlanto-axial joint in human fetuses
title_fullStr A temporary disc-like structure at the median atlanto-axial joint in human fetuses
title_full_unstemmed A temporary disc-like structure at the median atlanto-axial joint in human fetuses
title_sort A temporary disc-like structure at the median atlanto-axial joint in human fetuses
dc.creator.none.fl_str_mv Sakanaka, Koichiro
Yamamoto, Masahito
Hirouchi, Hidetomo
Kim, Ji Hyun
Murakami, Gen
Rodríguez Vázquez, José Francisco
Abe, Shinichi
author Sakanaka, Koichiro
author_facet Sakanaka, Koichiro
Yamamoto, Masahito
Hirouchi, Hidetomo
Kim, Ji Hyun
Murakami, Gen
Rodríguez Vázquez, José Francisco
Abe, Shinichi
author_role author
author2 Yamamoto, Masahito
Hirouchi, Hidetomo
Kim, Ji Hyun
Murakami, Gen
Rodríguez Vázquez, José Francisco
Abe, Shinichi
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 611.013
Disk
Human fetuses
Median atlanto-axial joint
Meniscoid
Anatomía
2410.02 Anatomía Humana
2410.06 Embriología Humana
topic 611.013
Disk
Human fetuses
Median atlanto-axial joint
Meniscoid
Anatomía
2410.02 Anatomía Humana
2410.06 Embriología Humana
description During observations of mid-term and late-stage fetuses, we found a joint disk-like structure at the anterior component of the median atlanto-axial joint. At mid-term, the disk-like structure was thick (0.1–0.15 mm) relative to the sizes of bones surrounding the joint. However, it did not completely separate the joint cavity, and was absent in the inferior and/or central part of the cavity. This morphology was similar to the so-called fibroadipose meniscoid of the lumbar zygapophysial joint that is usually seen in adults. In mid-term fetuses, there was evidence suggesting that a mesenchymal tissue plate was separated from a roof of the joint cavity. In late-stage fetuses, the thickness (less than 0.15 mm) was usually the same as, or less than that at mid-term, and the disk-like structure was often flexed, folded and fragmented. Therefore, in contrast to the zygapophysial meniscoid as a result of aging, the present disk-like structure was most likely a temporary product during the cavitation process. It seemed to be degenerated in late-stage fetuses and possibly also in newborns. Anomalies at the craniocervical junction such as Chiari malformations might accompany this disk-like structure at the median atlanto-axial joint even in childhood.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-01-01
2019
2019-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/109136
url https://hdl.handle.net/20.500.14352/109136
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Korean Association of Anatomists
publisher.none.fl_str_mv Korean Association of Anatomists
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869407053317931008
score 15,81155

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