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. 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.
Read more about Head: Human Head
Famous quotes containing the word head:
“I envy neither the heart nor the head of any legislator who has been born to an inheritance of privileges, who has behind him ages of education, dominion, civilization, and Christianity, if he stands opposed to the passage of a national education bill, whose purpose is to secure education to the children of those who were born under the shadow of institutions which made it a crime to read.”
—Frances Ellen Watkins Harper (1825–1911)
“In my day, we didn’t have the cocaine, so we went out and knocked somebody over the head and took the money. But today, all this cocaine and crack, it doesn’t give kids a chance.”
—Barry White (b. 1944)
“[Rutherford B. Hayes] was a patriotic citizen, a lover of the flag and of our free institutions, an industrious and conscientious civil officer, a soldier of dauntless courage, a loyal comrade and friend, a sympathetic and helpful neighbor, and the honored head of a happy Christian home. He has steadily grown in the public esteem, and the impartial historian will not fail to recognize the conscientiousness, the manliness, and the courage that so strongly characterized his whole public career.”
—Benjamin Harrison (1833–1901)