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------------------------------------------------ What is the first branchial arch also known as?

1) Mandibular arch
2) Hyoid arch
3) Gill arch
4) Pharyngeal arch

The First branchial arch is known as the Mandibular arch, critical in the development of the lower jaw, certain middle ear bones, and the oropharynx. Option 1.

Explanation:

The First branchial arch is also known as the Mandibular arch. This arch is a key structure in the early development of vertebrates, playing a critical role in the formation of the lower jaw (mandible), which includes elements of the jaw itself and the lower lip. It also contributes to the development of two bones in the middle ear and is integral to the formation of the oropharynx, which is part of the pharynx continuous with the oral cavity, aiding in respiration and digestion. This showcases how interconnected the development of various structures in the human body and other vertebrates are, starting from these embryonic arches.