A Study of the Os goniale in Man

Vázquez, Javier Fernández; Velasco, J.R. Mérida; Collado, Juan Jiménez

doi:10.1159/000147188

Cited by 33 publications

(4 citation statements)

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“…Likewise, the degenerating MC might induce the transformation of the AP–goniale complex to provide a fibrous band to add to or replace the usual SML. These transformations appeared to occur in stages between 19 and 26 weeks because we did not find such a strange protrusion in fetuses aged 16–18 weeks (CRL of 125–155 mm) in our previous studies (Rodríguez‐ Vázquez et al., 2020, 1991, 1992, 1993, 2011, 2016, 2018). A clue of the hypothetical transformation of the tympanic ring by the degenerating MC appeared to be found in the specific matrix (Sakakura et al., 2005; Shibata et al., 2014, 2019).…”

Section: Discussionmentioning

confidence: 47%

“…The present study demonstrated that the AP–goniale complex was sometimes long enough to reach the infratemporal fossa. The membranous bone appears in fetuses at 16–18 weeks (125–155 mm in CRL) (Rodríguez‐Vázquez et al., 1991, 2016), and it does not replace the initial cartilaginous connection between the MC and malleus but “adds or newly builds” just below the initial connection (Figure 1b). Because the AP–goniale complex was continuous with the secondary periosteal bone of the malleus, its color was similar to the periosteal bone collar of a long bone.…”

Section: Discussionmentioning

confidence: 99%

“…However, according to Standring (2005), the anterior process of the malleus (AP) is a membranous bone developed in the “perichondrium” of the MC. In this context, we should consider the membranous bone “os goniale” because it develops in the perichondrium of the MC after 8 weeks of gestation, extends along the anteroposterior axis, and “newly” builds up the AP (Figure 1b) (Rodríguez‐Vázquez et al., 1991, 2016). Given that the AP is continuous with the os goniale below, we call them together the “AP–goniale complex.” In rodent models, Shibata et al.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 47%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…It has long been known that the first reflex movements of mouth opening occur at 8–9 weeks of gestation (Humphrey, 1968), at which time the temporomandibular joint has not yet formed (Mérida‐Velasco et al, 1999). Instead, there is a connection between the dorsal end of Meckel's cartilage (which would give rise to the malleus) and the incus (Rodríguez Vázquez et al, 1991). Therefore, any fetal movements at this stage of development must involve this joint, which would be the primary jaw articulation (Mérida‐Velasco et al, 1990).…”

Section: Discussionmentioning

confidence: 99%

Development and growth of median structures in the human tongue: A histological study using human fetuses and adult cadavers

Yamamoto

Hirota

Watanabe

et al. 2023

The Anatomical Record

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Glossectomy is a surgical procedure performed to remove all or part of the tongue in patients with cancer. The removal of a significant part of the tongue has a marked effect on speech and swallowing function, as patients may lose not only the tongue muscles but also the median lingual septum (MLS). Therefore, to achieve successful tongue regeneration, it is necessary to investigate the developmental processes of not only the tongue muscles but also the MLS. This study was conducted to clarify the mutual development of the tongue muscles and the MLS in human fetuses. Serial or semi‐serial histological sections from 37 embryos and fetuses (aged 5–39 weeks) as well as nine adults were analyzed. The MLS appeared at Carnegie stage 15 (CS15), and until 12 weeks of gestation, abundant fibers of the intrinsic transverse muscle crossed the septum in the entire tongue. However, in near‐term fetuses and adults, the contralaterally extending muscles were restricted to the deepest layer just above the genioglossus muscle. This finding indicates that the crossing transverse muscle showed the highest density at mid‐term. A thorough understanding of both the MLS and the tongue muscles is necessary for successful tongue regeneration.

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Development of Meckel's cartilage in the symphyseal region in man

et al. 1997

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Background: The aim of this work is to clarify the aspects which are at present most controversial about the development of the anterior segments of Meckel's cartilage, such as the role of and determination of the area that is incorporated in the development of the human mandible.Methods: Light microscope studies were done on 25 embryos and human fetuses from the collection of the Institute of Embryology at the University Complutense of Madrid and the Department of Morphological Science from the University of Granada. Specimen length was between 18 and 125 mm crown-rump.Results: During the embryonic period, Meckel's cartilages were placed in the midline of the mandibular arch but fusion was not observed between them. Ossification of Meckel's cartilage begins at the end of the embryonic period and is completed in the fetal period and the portion that participates in mandibular formation is determined. This segment extends from the mental foramen to near the midline of the mandible. In this region, on the dorsal surface of the symphysis, cartilaginous nodules that originate from Meckel's cartilage are isolated.Conclusions: The ventral portions of Meckel's cartilage do not fuse in the midline of the mandibular arch. These present endo-and perichondral ossification and the section from the mental foramen to near the midline (mandibular symphysis) participates in mandibular formation. The ventral ends of Meckel's cartilage, i.e., the ends nearest the midline, do not ossify and remain isolated on the dorsal surface of the fetal mandibular symphysis. Anat.

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A Study of the Os goniale in Man

Cited by 33 publications

References 2 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

Development and growth of median structures in the human tongue: A histological study using human fetuses and adult cadavers

Development of Meckel's cartilage in the symphyseal region in man

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