Novice 29++ Pretrematic Nerve Of First Pharyngeal Arch
Novice 29++ Pretrematic Nerve Of First Pharyngeal Arch. The first pharyngeal arch also mandibular arch (corresponding to the first branchial arch or gill arch of fish), is the first of six pharyngeal arches that develops in fetal life during the fourth week of development. The first pharyngeal arch is comprised of two parts: Philtrum of the lip, the maxilla and incisors, and the primary palate. In fishes it splits into 2 main branches: