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:
“The traveller on the prarie is naturally a hunter, on the head waters of the Missouri and Columbia a trapper, and at the Falls of St. Mary a fisherman.”
—Henry David Thoreau (1817–1862)
“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)
“Woman is the crown of all creation, but Man is the head who wears it, and even the servant is master in his house.”
—Franz Grillparzer (1791–1872)