Head
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.
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Famous quotes containing the word head:
“But it thought no bed too narrow—it stood with lips askew
And shook its great head sadly like the abstract Jew.”
—Robert Penn Warren (1905–1989)
“A lock-jaw that bends a man’s head back to his heels, hydrophobia, that makes him bark at his wife and babes, insanity, that makes him eat grass; war, plague; cholera, famine, indicate a certain ferocity in nature, which, as it had its inlet by human crime, must have its outlet by human suffering.”
—Ralph Waldo Emerson (1803–1882)
“It is better to have your head in the clouds, and know where you are ... than to breathe the clearer atmosphere below them, and think that you are in paradise.”
—Henry David Thoreau (1817–1862)