'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 do not have a head, but many bilaterally symmetric forms do. Vertebrates in particular have distinctive heads, which is associated with the development of the neural crest in the developing vertebrate Italic text''Italic text'Italic textembryo.* [LINK: http://www.nature.com/news/2000/000810/full/news000810-1.html] Getting a Head, article from Nature Online. The contents of the vertebrate head are protected by an encl