Abstract
Craniometric observations of various sorts of triangles formed by hypophyseal point as its base are of interest for both the scholars of anthropology and comparative anatomy. Stated in the following are the findings of the craniometric studies made on such triangles comparisons being made among different species of animals with special reference to the dog.
Mean of ∠APB in ΔAPB of the dog is 156.64°, and ∠PAB and ∠PBA of the dog are the smallest among all animal species examined.
In ΔPNA, ∠PNA of the dog is very large, while that of the human being is the smallest. ∠PAN and ∠PAN of the dog are the smallest, and these angles become larger in higher animals.
In ANB, ∠ANB of the dog is the largest, while that of the human being is the smallest. ∠NAB and ∠ABN of the dog are the smallest, and they become larger in higher animals.
In NPB of the dog, both ∠PNB and ∠PBN show minus, and ∠NPB is the largest with the mean of 197.85°. While, higher animal shows smaller ∠NPB.
As for the lengths of the sides forming above mentioned three triangles in the dog, the side AP is longer, the side PB is slightly shorter and the side AP is much longer than the respective findings of the human being.
