Letter to the Editor: “Pterygospinous and pterygoalar bars in children”

Cho, Kwang Ho; Yamamoto, Masahito; Murakami, Gen; Rodríguez‐Vázquez, José Francisco

doi:10.1007/s00276-022-02935-6

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…However, these ligaments are separated and developed independently (Rodríguez‐Vázquez et al., 1993, 1998, 2011). Likewise, at the external skull base near the temporal bone fissure, the real spine can be easily discriminated from the variant bony bars (pterygospinous and pterygoalar bars) (Cho et al., 2022; Dodo, 1974). The major anatomical terms used are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Sphenomandibular ligament and degenerating Meckel's cartilage revisited: Sequential variations with temporal bone deformity for ligament attachment in near‐term human fetuses

Jin,

Honkura,

Yamamoto

et al. 2023

Journal of Anatomy

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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.

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Section: Introductionmentioning

confidence: 99%

Sphenomandibular ligament and degenerating Meckel's cartilage revisited: Sequential variations with temporal bone deformity for ligament attachment in near‐term human fetuses

Jin,

Honkura,

Yamamoto

et al. 2023

Journal of Anatomy

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Transient contribution of the sphenoid ala major to the socket of the temporomandibular joint in near‐term fetuses

Hirouchi,

Takeuchi,

Yang

et al. 2024

The Anatomical Record

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The temporomandibular joint (TMJ) is a complex structure that plays a vital role in the movement of the jaw. Some anatomy and dental textbooks show that, at the medial margin, the TMJ capsule attaches to a suture between the sphenoid ala major and the temporal bone squamosa. In near‐term fetuses, the ala major extends posterolaterally to approach the TMJ. In this study, we aimed to investigate the contribution of the sphenoid ala major to the socket of the TMJ in near‐term fetuses. We examined histological sections from 22 human fetuses (approximately 15–40 weeks). At midterm, the lateral and superior walls of the TMJ cavity were formed by the temporal bone squamosa, whereas the ala major was distant from the joint. However, at near‐term, the ala major formed the medial wall of almost the entire part of the joint cavity. The top of the TMJ was attached to both the squamosa and ala major, with the condylar head consistently separated from the sphenoid by the joint disk. We observed a significant descent of the middle cranial fossa in near‐term fetuses, which brought the ala major close to the TMJ. This transient position of the TMJ near the sphenoid is likely due to brain enlargement and posterolateral growth of the ala major. After birth, occlusion causes the anterior growth of the mandibular fossa of the squamosa, which moves the ala major away from the TMJ. Similarly, the lateral growth of the sphenoid toward the squamosa suture may also stop in children.

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Letter to the Editor: “Pterygospinous and pterygoalar bars in children”

Cited by 2 publications

References 8 publications

Sphenomandibular ligament and degenerating Meckel's cartilage revisited: Sequential variations with temporal bone deformity for ligament attachment in near‐term human fetuses

Sphenomandibular ligament and degenerating Meckel's cartilage revisited: Sequential variations with temporal bone deformity for ligament attachment in near‐term human fetuses

Transient contribution of the sphenoid ala major to the socket of the temporomandibular joint in near‐term fetuses

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