| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
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| Outline of Final Research Achievements |
The aim of this study was to determine how the crania of amniotes, which consist of birds, reptiles and mammals, are homologous between the various phylogenetic groups. Our previous studies have shown that the conventional theory of vertebrate cranial homology requires a complete reconsideration. In the course of this reexamination, we focused on the phenomenon of suture closure between bones. We were able to overturn the conventional understanding of the homology of mammalian premaxillary bone from both the macroscopic approach of comparative anatomy and palaeontology and experimental embryology. We proposed to dismiss the anatomical names given to each bone of the skull since the 18th century and to construct a new framework of cranial
bone identity based on the suture closure between the bones. The results of this study have opened the avenue to a new framework of cranial bone homology.
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