branchial or pharyngeal arch /proliferation of mesenchyma of primitive pharynx /6 pairs branchial groove: the/ depressions between branchial arch 状体板 耳板 稳3 额鼻屠起 隆起 个下隆起 口i跟 原始咽 心隆起 心駐 B---branchial or pharyngeal arch: /proliferation of mesenchyma of primitive pharynx /6 pairs ---branchial groove: the depressions between branchial arch