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:
“I mind how once we lay such a transparent summer morning,
How you settled your head athwart my hips and gently turn’d over
upon me,
And parted the shirt from my bosom-bone, and plunged your tongue to my bare-stript heart,
And reach’d till you felt my beard, and reach’d till you held my
feet.”
—Walt Whitman (1819–1892)
“Your head so much concerned with outer,
Mine with inner, weather.”
—Robert Frost (1874–1963)
“When we stand the truth on its head we generally fail to notice that our head is not standing where it should be standing either.”
—Friedrich Nietzsche (1844–1900)