Coronal bone

…In animals of the bony or higher order, at the beginning of individual development, they have a cartilaginous jawbone similar to that of cartilaginous fish, but eventually the rear part of the quadrate cartilage of the palate ossifies to become a bone called the quadrate bone, and other bones such as the premaxilla, maxilla, palatine, and pterygoid develop secondarily to form the skeleton of the upper jaw. In the lower jaw, only the rear end of the mandibular cartilage ossifies to become an articular bone, but the rest of the jaw shrinks, and instead several types of bones such as the dentary and coronal bone develop secondarily and join together to form the skeleton of the lower jaw. Bones that first develop as cartilage and then ossify are called cartilaginous bones or replacement bones, while bones that appear secondarily without passing through cartilage are called dermal or membranous bones because they form directly in the dermis. …

*Some of the terminology that refers to the "coronary bone" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…硬骨魚類以上の動物は個体発生の初めには軟骨魚類と同様の軟骨性の顎骨をもつが，やがて口蓋方形軟骨の後部が骨化して方形骨(方骨)という骨になり，そのほかに前顎骨，上顎骨，口蓋骨，翼状骨などの骨が二次的に発生して上顎の骨格を形成する。下顎では，下顎軟骨は後端だけ骨化して関節骨になるが他の部分は退縮していき，代りに歯骨，冠状骨など数種の骨が二次的に発生して結合しあい，下顎の骨格をつくる。はじめ軟骨として発生し，それが骨化してできる骨を軟骨性骨または置換骨といい，それとは異なって軟骨をへずに二次的に現れる骨は真皮中に直接形成されるので皮骨または膜骨という。…

※「冠状骨」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