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:
“With the old kindness, the old distinguished grace,
She lies, her lovely piteous head amid dull red hair
Propped upon pillows, rouge on the pallor of her face.
She would not have us sad because she is lying there,
And when she meets our gaze her eyes are laughter-lit,
Her speech a wicked tale that we may vie with her....”
—William Butler Yeats (1865–1939)
“Someone approaches to say his life is ruined
and to fall down at your feet
and pound his head upon the sidewalk.”
—David Ignatow (b. 1914)
“A lioness, with udders all drawn dry,
Lay couching, head on ground, with cat-like watch
When that the sleeping man should stir; for ‘tis
The royal disposition of that beast
To prey on nothing that doth seem as dead.”
—William Shakespeare (1564–1616)