The first branchial arch, also called the first pharyngeal arch and mandibular arch, is the first of six pharyngeal arches that develops in fetal life during the fourth week of development. It is located between the stomodeum and the first pharyngeal groove.
Read more about First Pharyngeal Arch: Processes, Meckel's Cartilage, Derivatives, Nerve Supply, Blood Supply, Additional Images
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“Men seem anxious to accomplish an orderly retreat through the centuries, earnestly rebuilding the works behind them, as they are battered down by the encroachments of time; but while they loiter, they and their works both fall prey to the arch enemy.”
—Henry David Thoreau (1817–1862)