The Prenatal Inter-Relationships of the Maxilla and Premaxilla in the Facial Development of Man

Kraus, Bertram S.; Decker, Jay D.

doi:10.1159/000141590

Cited by 35 publications

(13 citation statements)

References 6 publications

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“…13-23), the primordia of the latter arising to the palatal side of, but in close proximity with, the maxillary nerve. This observation is in agreement with those of Humphry [1866], Gants [1922], Brash [1924], Kraus [1960] and Kraus and Decker [1960] in man, Brodie [1942], Scott [1951a, b], in pig and sheep and Gaunt [1961b] in the hamster. However, in the mouse and hamster the premaxillae form an important part of the anterior facial region and the palatal aspect of the diastema.…”

Section: Discussionsupporting

confidence: 91%

The Development of the Teeth and Jaws of the Albino Mouse

Gaunt¹

1964

Cells Tissues Organs

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Section: Discussionsupporting

confidence: 91%

The Development of the Teeth and Jaws of the Albino Mouse

Gaunt¹

1964

Cells Tissues Organs

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“…Other authors hold that bone from the maxillary ossification center spreads anterior to the incisive bone between 12 and 16 weeks of fetal age (Callender, 1869;Vallois and Cadenat, 1924;AshleyMontagu, 1935;Wood Jones, 1947;Woo, 1949). Kraus and Decker (1960) find that both fusion and overgrowth occur but not as described in the literature. In contrast, Wood et al (1967) suggest that the incisive bone, in its alveolar region, may never have a truly separate existence in the human skull.…”

mentioning

confidence: 97%

Chimpanzee variation facilitates the interpretation of the incisive suture closure in South African Plio-Pleistocene hominids

Braga

1998

Am. J. Phys. Anthropol.

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For a better understanding of early hominid growth patterns, we need to compare skeletal maturation among humans and chimpanzees. This study provides new data on variation of the incisive suture closure in extant species to facilitate the understanding of growth patterns among South African Plio-Pleistocene hominids. The complete anterior closure of the incisive suture occurs early during human life, mostly before birth. In contrast, in chimpanzees a complete anterior closure occurs mostly after the eruption of either the first permanent molars (pygmy chimpanzees) or the third molars (common chimpanzees). The first aim of this study is to test whether the patterns of closure of both the anterior and palatal components of the incisive suture in chimpanzees accurately mirror their polytypism by investigating 720 museum specimens of known geographical origin. Then we use the data gleaned from the incisive suture closure in chimpanzees to determine whether there are different growth patterns among South African Plio-Pleistocene hominids and to interpret them. Results about the pattern of incisive suture closure are consistent with the differences among chimpanzees as revealed by molecular data. Thus, the variation in chimpanzee patterns of incisive suture closure facilitates the interpretation of morphology in South African fossil hominids. In Australopithecus (Paranthropus) robustus as compared to Australopithecus africanus, the complete anterior closure and, probably, the complete palatal closure of the incisive suture occurs during early life in the same way as they occur in humans. Moreover, the closure pattern observed on Stw 53, a supposed early Homo from Sterkfontein Member 5, is similar to that seen in A. africanus and in chimpanzees. Thus, with respect to the anterior component of the incisive suture, A. africanus and Stw 53 retain the primitive feature for which A. (P.) robustus and Homo share the derived character state. Finally, it is worth noting that the Taung child does not show the robust condition.

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“…This phenomenon could be confirmed by serial histologic sections in the frontal plane. The APGCs could correspond to the area of the labial cuspid alveolus described by Kraus and Decker [12], from which the over growth of heavily trabecularized bone originates. They indicated the palatal bone to be a separate structure from the maxilla proper.…”

Section: Discussionmentioning

confidence: 98%

Prenatal Growth Pattern of the Human Maxilla

Lee

Kim

Lim

et al. 1992

Cells Tissues Organs

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Regarding maxillofacial morphogenesis there has been a long debate on the growth of the maxillary structure. Using 120 normal fetal maxillae of gestational ages from 16 to 41 weeks, palatal radiograms and frontal histologic sections were made. We have observed two pairs of accentuated growth areas in the fetal maxillae and named them primary growth centers to formulate the maxillary trapezoid (MT) by radiologic image. The MT is formed by four primary growth centers that are best demonstrated by palatal radiograms of the fetal maxilla as well as by frontal histologic sections. The dimensional increase in the MT during the fetal period is documented and statistically analyzed. From this series of results, we have suggested that the growth centers which demarcate the MT are the basic structures of the developing human maxilla. It was also found that the four primary growth centers are the most active sites for maxilla formation until 20 weeks of gestation and thereafter the growth of the maxilla is enhanced by the participation of the intramembranous bone formation along the periphery. This was in contrast to the central primary growth centers that have already finished maturation in the early fetal period and remain only as a peripherally radiating arrangement of thick trabecular bones.

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The Prenatal Inter-Relationships of the Maxilla and Premaxilla in the Facial Development of Man

Cited by 35 publications

References 6 publications

The Development of the Teeth and Jaws of the Albino Mouse

The Development of the Teeth and Jaws of the Albino Mouse

Chimpanzee variation facilitates the interpretation of the incisive suture closure in South African Plio-Pleistocene hominids

Prenatal Growth Pattern of the Human Maxilla

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