Morphology and Analysis of the Development of the Human Temporomandibular Joint and Masticatory Muscle

Sato, Iwao; Ishikawa, Hiroyuki; Shimada, Kyuhachiro; Ezure, Hiromitsu; Satô, Tôru

doi:10.1159/000147555

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…From 28 weeks, masticatory muscles were associated with the increased radiographic density of the TMJ during formation of the human mandible (Sato et al, 1994). In our results, radiographic density level at the MS of the mandible gradually increased from 16 weeks to 28 weeks.…”

Section: Discussionsupporting

confidence: 61%

“…Condensed cellular mesenchyme of the condylar blastema is closely associated with the perichondral fibrous tissue of Meckel's cartilage (Lee et al, 2001). The function and development of masticatory muscles affect the development of the human mandible (Bresin et al, 1999;Kiliaridis and Katsaros, 1998;Sato et al, 1994). Hyoid muscles (digastric and geniohyoid muscles) insert into the periosteum and endosteum connective tissue of immature and mature bone in the medial region of the mandible.…”

mentioning

confidence: 99%

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Distribution of Tenascin-C and -X, and Soft X-ray Analysis of the Mandibular Symphysis during Mandible Formation in the Human Fetus

Kurihara

Sato

2004

Okajimas Folia Anat. Jpn.

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Summary: In the development of the human mandible, the process of bone calcification, distribution and expression of tenascin-C and -X in the mental symphyseal region are unknown. The purpose of this study was to determine the distribution of these extracellular matrices in the connective tissue around calcified tissues located on the mental symphyseal region of the human fetus during development through histological and radiographical studies.The radiographic density increased from 16 weeks to 24 weeks gestation in all examined regions; in contrast, the diameter of muscle fiber in the suprahyoid muscles (digastric anterior and geniohyoid muscles) inserted into the inner mental symphyseal region increased from 24 weeks gestation. The extracellular matrices (tenascin) were shown to have a different distribution in the mental symphyseal region of the human fetus at each stage. These different distributions of tenascin-C and -X were found around the epithelium and the endomysium of the mental symphyseal region, and affect the specific formation of the mandible during ossification with hyoid muscle development in human fetus.

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Section: Discussionsupporting

confidence: 61%

mentioning

confidence: 99%

Distribution of Tenascin-C and -X, and Soft X-ray Analysis of the Mandibular Symphysis during Mandible Formation in the Human Fetus

Kurihara

Sato

2004

Okajimas Folia Anat. Jpn.

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“…remained unanswered. It was suggested that it may depend on the early mouth opening movement, primarily induced by tongue musculature which matured quite early in orofacial structures (Bresin et al, 1999;Kang et al, 1992;Kiliaridis and Katsaros, 1998;Lee et al, 1990;Lightfoot and German 1998;Ogutcen-Toller and Juniper, 1993;Radlanski et al, 1999;Robertson and Bankier 1999;Sato et al, 1994). It was also reported that it may be influenced by mandibular movement in the human embryo beginning around week 8 of fertilization, when the temporomandibular joint is yet to be formed (Hall 1982a,b;Kjaer, 1997;Ouchi et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Prenatal development of the human mandible

et al. 2001

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In an effort to better understand the interrelationship of the growth and development pattern of the mandible and condyle, a sequential growth pattern of human mandibles in 38 embryos and 111 fetuses were examined by serial histological sections and soft X-ray views. The basic growth pattern of the mandibular body and condyle appeared in week 7 of fertilization. Histologically, the embryonal mandible originated from primary intramembranous ossification in the fibrous mesenchymal tissue around the Meckel cartilage. From this initial ossification, the ramifying trabecular bones developed forward, backward and upward, to form the symphysis, mandibular body, and coronoid process, respectively. We named this initial ossification site of embryonal mandible as the mandibular primary growth center (MdPGC). During week 8 of fertilization, the trabecular bone of the mandibular body grew rapidly to form muscular attachments to the masseter, temporalis, and pterygoid muscles. The mandible was then rapidly separated from the Meckel cartilage and formed a condyle blastema at the posterior end of linear mandibular trabeculae. The condyle blastema, attached to the upper part of pterygoid muscle, grew backward and upward and concurrent endochondral ossification resulted in the formation of the condyle. From week 14 of fertilization, the growth of conical structure of condyle became apparent on histological and radiological examinations. The mandibular body showed a conspicuous radiating trabecular growth pattern centered at the MdPGC, located around the apical area of deciduous first molar. The condyle growth showed characteristic conical structure and abundant hematopoietic tissue in the marrow. The growth of the proximal end of condyle was also approximated to the MdPGC on radiograms. Taken together, we hypothesized that the MdPGC has an important morphogenetic affect for the development of the human mandible, providing a growth center for the trabecular bone of mandibular body and also indicating the initial growth of endochondral ossification of the condyle.

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“…In early stages (up to 53 mm CRL) movement of the mandibular structures hinged at the most distal part of Meckel's cartilage seems to be obvious. Active movement can be expected in this region as soon as muscles have developed (36). As soon as a protrusion has formed at the distal end of the mandibular bone a mutual interaction between temporal and mandibular tissue can be assumed to shape the outlines of the glenoid fossa and the condylar process, as well as the other joint tissues involved.…”

Section: Discussionmentioning

confidence: 99%

Development of the human temporomandibular joint. Computer‐aided 3D‐reconstructions

Radlanski

Lieck

Bontschev

1999

European J Oral Sciences

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Computer-aided graphical three-dimensional reconstructions of histological serial sections of 12 human embryos and fetuses (25-250 mm Crown-rump length (CRL)) were used to trace the prenatal development of the elements of the human temporomandibular joint. The primordia of the condylar and coronoid processes could be identified as two bony peaks at the dorsal ends of the mandible at the stage of 25 mm CRL. The primordium of the temporal bone already existed at the stage of 37 mm CRL. The bone was apparent with a convex contour towards the condyle. The glenoid fossa was not yet visible. At 65 mm CRL, the osseous glenoid fossa could be distinguished at the enlarged temporal bone formation. The glenoid fossa developed posteriorly and medially from the condyle and extended in cranial and anterior direction. The glenoid fossa had various contours, changing from flat and slightly convex (65 mm CRL) to concave (250 mm CRL) with an articular tubercle. The distance between fossa and condyle increased proportionally. The lower joint cavity appeared at an earlier stage (65 mm CRL) than the upper joint cavity (70 mm CRL). Both cavities started development as isolated compartments fusing later on. The upper joint cavity followed the contour of the fossa, whereas the lower joint cavity followed the form of the condyle. The biconcave shape of the articular disc as well as the attachment of the lateral pterygoid muscle could be observed very early (70 mm CRL).

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Morphology and Analysis of the Development of the Human Temporomandibular Joint and Masticatory Muscle

Cited by 10 publications

References 8 publications

Distribution of Tenascin-C and -X, and Soft X-ray Analysis of the Mandibular Symphysis during Mandible Formation in the Human Fetus

Distribution of Tenascin-C and -X, and Soft X-ray Analysis of the Mandibular Symphysis during Mandible Formation in the Human Fetus

Prenatal development of the human mandible

Development of the human temporomandibular joint. Computer‐aided 3D‐reconstructions

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