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.

Famous quotes containing the word head:

“Come, Kate, thou art perfect in lying down.
Come, quick, quick, that I may lay my head in thy lap.”
—William Shakespeare (1564–1616)

“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)

“Unquiet wanderer
Draw the Glasnevin coverlet anew
About your head till the dust stops your ear,
The time for you to taste of that salt breath
And listen at the corners has not come;
You had enough of sorrow before death—”
—William Butler Yeats (1865–1939)