This book is an overview of primary sensory maps of vertebrates, characterized by continuous and discrete properties. The eight primary sensory maps of vertebrates have unique features and use distinct molecular cues, cell cycle exit, and activity combinations during development, regeneration, and plasticity. As an introduction and overview, the book provides a short overview for all eight sensory senses and presents through evolution and gene regulatory networks, the molecular cues needed for sensory processing. Independent contributions are included for olfactory, vision, trigeminal, taste, vestibular, auditory, lateral line, and electroreception.