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Biography
other usesIn anatomy , the head of an animal is the Anatomical terms of location#Directional terms|rostral part (from anatomical position) that usually comprises the brain , eye s, ear s, nose and mouth (all of which aid in various sensory functions, such as visual perception|sight , Hearing (sense)|hearing , olfaction|smell , and taste ). Some very simple animals may not have a head, but many bilateria|bilaterally symmetric forms do. Heads develop in animals by an evolutionary trend known as cephalization . In bilaterally symmetrical animals, nerve tissues concentrate at the anterior region, forming structures responsible for information processing. Through biological evolution , sense organs and feeding structures also concentrate into the anterior region, which collectively form the head.
Human head
main article|Human headIn human anatomy, the head is the upper portion of the human body . It supports the face and is maintained by the Human skull|skull , which itself encloses the Human brain|brain . Humans have the largest head size relative to body size of any species.citation needed |date = March 2012
