In anatomy, the head of an animal is the rostral part (from anatomical position) that usually comprises the brain, eyes, ears, nose, and mouth (all of which aid in various sensory functions, such as sight, hearing, smell, and taste). Some very simple animals may not have a head, but many bilaterally symmetric forms do. Anatomy generally Bilateral symmetry The very simplest animals don't have a head, but many bilaterally symmetric forms do. Vertebrates in particular have distinctive heads, whic… (More on Head)