…One or two horns grow on the nasal bone or sometimes on the upper midline of the frontal bone in both sexes, and the males generally have larger horns. The horn core is a type of horn found in bovids, consisting of a hollow horny sheath (horn sheath) and a bony core (horn core) that connects to the skull. It grows in one pair on the frontal or parietal bone, or rarely two pairs (in the four-horned antelope). As the horn sheath grows, a new layer forms on its inside, and the old layer is pushed upward but does not fall off. … *Some of the terminology that refers to "square core" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…鼻骨ときに前頭骨の上面正中線にあたる部分に,雄雌とも1~2本生じ,一般に雄の角のほうが大きい。洞角horn coreはウシ科の動物に見られる角で,中空の角質の鞘(さや)(角鞘(かくしよう))と,頭骨につながる骨質の芯(角芯)からなり,前頭骨か頭頂骨に1対,まれに2対(ヨツヅノレイヨウ)生ずる。角鞘は,成長するにつれてその内側に新しい層が形成され,古い層は上方に押し上げられるが,抜け落ちない。… ※「角芯」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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