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.
Read more about Head: Human Head
Famous quotes containing the word head:
“Piece by piece I seem
to re-enter the world: I first began
a small, fixed dot, still see
that old myself, a dark-blue thumbtack
pushed into the scene,
a hard little head protruding
from the pointillist’s buzz and bloom.”
—Adrienne Rich (b. 1929)