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| Description: Five pairs of pharyngeal arches (branchial arches) also develop on each side of the future head and neck regions during the 4th week. Each arch is separated by a pharyngeal cleft. Picture Stats: Views: 200 Filesize: 451.71kB Height: 486 Width: 878 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40520 |