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:
“I marvel thy master hath not eaten thee for a word, for thou art not so long by the head as honorificabilitudinitatibus.”
—William Shakespeare (1564–1616)
“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)
“Dead drunk
is the term I think of,
insensible,
neither cool nor warm,
without a head or a foot.
To be drunk is to be intimate with a fool.”
—Anne Sexton (1928–1974)