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:
“Your head was
radiant in its emptiness,
a small clean room.”
—Denise Levertov (b. 1923)
“Come, Kate, thou art perfect in lying down.
Come, quick, quick, that I may lay my head in thy lap.”
—William Shakespeare (1564–1616)
“There’s Margaret and Marjorie and Dorothy and Nan,
A Daphne and a Mary who live in privacy;
One’s had her fill of lovers, another’s had but one,
Another boasts, “I pick and choose and have but two or three.”
If head and limb have beauty and the instep’s high and light
They can spread out what sail they please for all I have to say....”
—William Butler Yeats (1865–1939)