ニホンザルの発育I : 頭骨の形態的変化I

概要

論文の詳細を見る
The shape of the cranium of Macaca fuscata (BLYTH) changes considerably through life. When respective cranial characters are examined in detail during the post-natal development, they are sorted into three categories; characters of "type a" manifest remarkable changes, those of "type c" remain almost unchanged and those of "type b" are of intermediate. In the present paper, post-natal changes in the characters of "type a" are dealt with. Those changes seem to relate to the enlargement of muscles, especially strong muscles of mastication, and to developement of those surrounding the dentition. In consequence of unequal growth in different parts of the cranium, the mouth part progressively protrude. On the other hand, the neurocranium, becomes rigid, in the general appearance being furnished with prominent ridges and nearly closed sutures. In mandible, the ramus remarkably expands, ridges and roughness on the ramus become prominent, and the part which associates with dentition noticeably elongate.
1960-10-15