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:
“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 (1840–1928)
“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)
“She, her head back, waited
Barbarous the stalking tide;
Her, nor balked nor sated
But plunged into the wide
Area of mental ire,
Lay at her wandering side.”
—Allen Tate (1899–1979)