@article{oai:niigata-u.repo.nii.ac.jp:00026306,
 author = {岩久, 文彦},
 issue = {2},
 journal = {新潟歯学会雑誌, 新潟歯学会雑誌},
 month = {Dec},
 note = {In view of the masticatory and deglutitive functions morphological features of the transverse palatine ridges were studied in relation to the curvature of the hard palate from 20 species in 18 genera of mammals. Material animals were classified into three groups according to their food-habits: the herbivorous including house-rabbits, holstein-cows, a nilgai, goats and a shika-deer, the carnivorous, dogs, a raccoon-dog, cats, a puma and a greater horseshoe-bat and the omnivorous, hogs, a hippopotamus, wistar-rats, black-rats, d-d mice, golden-hamsters, crab-eating monkeys, Formosan-monkeys, a Japanese monkey, a woolly monkey and a squirrel monkey. All the animals were adults except for hogs and goats which were juveniles. Hard palates were fixed in 10% formalin (though hippopotamus raw), and the dental plaster models of the hard palates and the transverse palatine ridges were made on the fixed materials. The measurement of the palatine length and width were done on the fixed materials and that of the concavaty of the hard palates using their sagittal and frontal sections on the models and the form of the hard palates were compared using the result obtained from the above sections among all the species used. As for the transverse palatine ridges, their appearance, number, located areas and bilateral symmetry to the palatine raphe were observed directly on the fixed materials, and then the morphological features were compared among species in the three groups. The hard palates of herbivorous animals have a slight concavaty in both the sagittal and the frontal directions, though there is a small convex area in front of the premolar dentition in the sagittal direction. There are three types of transverse palatine ridges observed of the animals in this group: the first type, which is basic to this group, is broad in width, running exactly transversely and has a clear prominence; the second is shorter and fewer in number; the third a reduced type narrow, somewhat smooth and indistinct, also fewer in number. These ridges are all located between the dental plate and the area of the premolar dentition. The carnivorous animals have flat palates and their transverse palatine ridges are almost all of the basic type. The ridges are varied in width, running transversely in front but obliquely in the caudal area. The morphological features of the ridges are similar between the dog and the raccoondog. The bat's ridges run straight and transversely in front and the caudal area, but they are curved in the premolar area. The ridges of the cat and the puma have lines of small tri-angular processes on them; their ridges occupy even the molar area. The omnivorous animals were devided into three sub-groups according to their food-habits; the hog and the hippopotamus belonging to the first sub-group which generally eat vegetables; rats, mice hamsters belonging to the second which eat grains and nuts; and monkeys belonging to the third which principally eat any kinds of food. The hard palates and the transverse palatine ridges of the first sub-group are similar particularly to those of herbivorous animals but their ridges have no papillary processes as in holstein-cow's ridges except for those at the premolar area., Animals in the second sub-group have flat palates which each a slight concavaty at the molar area. The transverse palatine ridges in the front area of their palates are similar in appearance three species, but the shape of the ridges in the molar area differs between the rats and the other two species. The ridges of wistar-rats and black-rats are composed of pyramidal processes in lines and those of the latter are broad, transversely running prominences. The fact that the front and the caudal area have such different types of ridges is peculiar to this sub-group. The last sub-group, monkeys, have deeply concaved palates. Their hard palates have two types of ridges; the fundamental ridges in this sub-group are narrow, smooth, low and transversely running prominences. The other type is shorter but similar to the fundamental ridges. The number of the ridges of this sub-group is a little more than those of the 2nd sub-group. Some papillae (Gegenbauer, 1878) are recognized in the caudal area. From the facts described above, it may be concluded as follows: (1) not only the forms and the curvatures of the hard palates but also the morphological characteristics of the transverse palatine ridges of each group seem very well to be suited to the food-habits of each group. (2) close, co-operative functions were recognized between the hard palate and the transverse palatine ridges. (3) the shapes of all the transverse palatine ridges are closely related to the masticatory function, and the curvatures of the hard palates at the caudal area is to the deglutitive function. (4) it was recognized that the shape of the transverse palatine ridges of the cat, puma, wistar-rat and black-rat is conspicuously modified to suit their food-habits.},
 pages = {1--41},
 title = {哺乳動物における横口蓋ヒダの形態学的研究},
 volume = {6},
 year = {1976}
}