The sutural or contact types among frontal, parietal, temporal and sphenoidal bones of skulls were investigated osteologically in various mammals.
The sutual type of the region of the pterion of skulls in Japanese domestic cats was the parieto-sphenoidal one in all 52 specimens examined. The contact pattern of the parieto-sphenoidal suture in the outer and inner faces of the skull differ from individual to individual in respect to its width and position. Its variations are given in Figs. 1 and 2. The parieto-sphenoidal contact on the outer face of the skull, indicates the possibility of a parieto-sphenoidal suture occurring on the inner face, on the same side.
From the comparative-anatomy standpoint, the sutural type of the region of the pterion in the outer face of the skull of Rodentia (rabbit and marmot), Non-ruminants (pig and wild boarn) and Perissodactyla (thorough bred horse and pony) is in general the fronto-temporal one. The fronto-temporal suture is formed usually in the goat but rather rare in cattle. This type in a serow (
Cap-ricornis crispus crispus Temminck, 1837) resembled the main pattern of the parieto-sphenoidal contact in cattle.The parieto-sphenoidal suture is formed generally in Primates (man) and Carnivora (lion, Japanese black bear and mongrel dog) except for a red fox which showed the fronto-temporal contact. (See Fig. 3)
The parieto-spheno-front-temporal contact was not detected for sure in all the mammals examined in the present study.
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