Original 38+ Pretrematic Nerve Of Second Arch
Original 38+ Pretrematic Nerve Of Second Arch. Ear development is attributed to both the first and second arch. Can also be caused by rubella in first trimester. The second arch becomes the hyoid and jaw support.1 in fish, the other posterior arches contribute to the branchial skeleton, which support in some lower animals, each arch is supplied by two cranial nerves. Second arch (chorda tympani is p.t.) arch origin of vagus (x).