RT Journal Article
T1 Sphenomandibular ligament and degenerating Meckel's cartilage revisited: Sequential variations with temporal bone deformity for ligament attachment in near‐term human fetuses
A1 Jin, Zhe‐Wu
A1 Honkura, Yohei
A1 Yamamoto, Masahito
A1 Hayashi, Shogo
A1 Murakami, Gen
A1 Abe, Hiroshi
A1 Rodríguez Vázquez, José Francisco
AB BackgroundThe sphenomandibular ligament (SML) is considered to originate from Meckel's cartilage (MC). However, no study has examined how the os goniale contributes to SML development.MethodsSemiserial histological sections of heads from 18 near-term fetuses at 27–40 weeks of gestation were examined.ObservationsThe os goniale and the anterior process of the malleus (AP) provided a long, bar-like membranous bone complex that passed through the petrotympanic and tympanosquamosal fissures. Notably, the AP–goniale complex is sometimes elongated inferiorly to join the SML (n = 4 specimens). Along the complex in the bone fissures, a degenerating MC was often present (n = 12). With (n = 6) or without (n = 3) the MC remnant, the tympanic bone (TYB) protruded inferomedially near the tympanosquamosal fissure, and it sometimes continued to a cartilaginous SML (n = 3). The temporal bone squamosa or petrosa provided a similar bony process approaching the SML. The middle meningeal artery often ran between the sphenoid and petrosa.ConclusionsMost of the specimens (n = 15) exhibited a sequential change from a cartilaginous SML as a continuation of the MC remnant to the ligament after the disappearance of the cartilage. The degenerating MC appeared to cause transformation from the AP–goniale complex and/or TYB to “another ligament” that replaced the usual SML at the upper part. Near the MC remnant, a similar transformation was also suggested on the squamosa or petrosa. The sphenoid spine appeared to originate often from the sphenoid ala major but sometimes from the TYB.
PB Wiley
SN 0021-8782
YR 2023
FD 2023-11-21
LK https://hdl.handle.net/20.500.14352/108928
UL https://hdl.handle.net/20.500.14352/108928
LA eng
NO Jin, Z.-W., Honkura, Y., Yamamoto, M.,Hayashi, S., Murakami, G., Abe, H. et al. (2024)Sphenomandibular ligament and degenerating Meckel'scartilage revisited: Sequential variations with temporal bonedeformity for ligament attachment in near-term humanfetuses. Journal of Anatomy, 244, 514–526. Available from:https://doi.org/10.1111/joa.13974help
NO Ministry of Education, Culture, Sports, Science andTechnology  (Japón)
DS Docta Complutense
RD 5 abr 2025