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:
“Behind the steering wheel
The boy took out his own forehead.
His girlfriends head was a green bag
Of narcissus stems. OK you win
But meet me anyway at Cohens Drug Store
In 22 minutes.”
—John Ashbery (b. 1927)
“Freud was a hero. He descended to the Underworld and met there stark terrors. He carried with him his theory as a Medusas head which turned these terrors to stone.”
—R.D. (Ronald David)
“A sparrow enters the tree,
Whereon immediately
A snow lump thrice his own slight size
Descends on him and showers his head and eyes,
And overturns him,”
—Thomas Hardy (18401928)