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:
“In some things, we Americans leave to other countries the carrying out of the principle that stands at the head of our Declaration of Independence.”
—Herman Melville (1819–1891)
“Being wakeful for her sake,
Remembering what she had,
What eagle look still shows,
While up from my heart’s root
So great a sweetness flows
I shake from head to foot.”
—William Butler Yeats (1865–1939)