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:
“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 was always startling to discover so plain a trail of civilized man there. I remember that I was strangely affected, when we were returning, by the sight of a ring-bolt well drilled into a rock, and fastened with lead, at the head of this solitary Ambejijis Lake.”
—Henry David Thoreau (1817–1862)
“Between my head and my hand, there is always the face of death.”
—Francis Picabia (1878–1953)