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Mentalis nerve branches supplying the lower lip revisited: a study of human fetuses and donated elderly cadavers

dc.contributor.authorCho, Kwang Ho
dc.contributor.authorSugiyama, Yuki
dc.contributor.authorWatanabe, Genji
dc.contributor.authorHirouchi, Hidetomo
dc.contributor.authorMurakami, Gen
dc.contributor.authorRodríguez Vázquez, José Francisco
dc.contributor.authorAbe, Shinichi
dc.date.accessioned2024-10-10T12:05:21Z
dc.date.available2024-10-10T12:05:21Z
dc.date.issued2024-04-29
dc.description.abstractPurpose Little information is known about the mentalis nerve course from the lower lip approximation margin (free margin) to the upper lip. Likewise, no difference in nerve distribution has been observed between the cutaneous and mucosal parts of the lip. Therefore, this study reexamined mentalis nerve morphology. Methods For macroscopic observations, three fresh cadavers were dissected (one male and two females; aged 78–93). We also evaluated histological sections obtained from five donated elderly cadavers (two males and three females, aged 82–96 years) and 15 human fetuses (11–40 weeks or crown–rump length 80–372 mm). Immunohistochemical analysis for S100 protein and tyrosine hydroxylase was performed. Results In both fetuses and adult cadavers, one to three nerve branches ran upward in the submucosal tissue from the mental foramen. Near the free margin of the lip, some branches passed through the orbicularis oris muscle layer toward the lip skin, whereas others followed a reversed J-shaped course along the free margin. Nerve twigs ran in parallel beneath the mucosa, whereas wavy nerve twigs attached to the basal lamina of the lip epidermis. The difference in nerve endings abruptly occurred at the skin–mucosal junction. Tyrosine hydroxylase-positive sympathetic nerve twigs surrounded arteries and formed a branch composed of S100-negative unmyelinated fibers. Conclusion The lower lip skin was innervated by a perforating branch passing through the orbicularis oris muscle, that was different from the lip mucosa. A sudden change in the nerve ending configuration at the mucocutaneous junction seemed to develop postnatally.
dc.description.departmentDepto. de Anatomía y Embriología
dc.description.facultyFac. de Medicina
dc.description.refereedTRUE
dc.description.statuspub
dc.identifier.doi10.1007/s00276-024-03365-2
dc.identifier.essn1279-8517
dc.identifier.issn0930-1038
dc.identifier.officialurlhttps://doi.org/10.1007/s00276-024-03365-2
dc.identifier.relatedurlhttps://link.springer.com/article/10.1007/s00276-024-03365-2
dc.identifier.urihttps://hdl.handle.net/20.500.14352/108859
dc.issue.number6
dc.journal.titleSurgical and Radiologic Anatomy
dc.language.isoeng
dc.page.final904
dc.page.initial895
dc.publisherSpringer
dc.rights.accessRightsrestricted access
dc.subject.cdu611
dc.subject.keywordFetus
dc.subject.keywordLip
dc.subject.keywordMental nerve
dc.subject.keywordMucosa
dc.subject.keywordNerve endings
dc.subject.keywordSkin
dc.subject.ucmCiencias Biomédicas
dc.subject.ucmAnatomía
dc.subject.unesco2410.02 Anatomía Humana
dc.subject.unesco2410 Biología Humana
dc.titleMentalis nerve branches supplying the lower lip revisited: a study of human fetuses and donated elderly cadavers
dc.typejournal article
dc.type.hasVersionVoR
dc.volume.number46
dspace.entity.typePublication
relation.isAuthorOfPublicationb4ed2eb6-cc8d-4563-b65f-318b85bf53d4
relation.isAuthorOfPublication.latestForDiscoveryb4ed2eb6-cc8d-4563-b65f-318b85bf53d4

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