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:
“I can’t make head or tail of Life. Love is a fine thing, Art is a fine thing, Nature is a fine thing; but the average human mind and spirit are confusing beyond measure. Sometimes I think that all our learning is the little learning of the maxim. To laugh at a Roman awe-stricken in a sacred grove is to laugh at something today.”
—Wallace Stevens (1879–1955)
“The back somersault, the kip-up—
And at last, the stand on his hands,
Perfect, with his feet together,
His head down, evenly breathing,”
—James Dickey (b. 1923)
““Danger! What danger do you foresee?”
Holmes shook his head gravely. “It would cease to be a danger if we could define it,” said he.”
—Sir Arthur Conan Doyle (1859–1930)