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
Other articles related to "head":
... Head injury refers to trauma of the head ... However, the terms traumatic brain injury and head injury are often used interchangeably in medical literature ... The incidence (number of new cases) of head injury is 300 of every 100,000 per year (0.3% of the population), with a mortality rate of 25 per 100,000 in North America and 9 per 100,000 in Britain ...
... Manfred Hugo is the full-time Landrat (head of the district authority) since the 1st of July, 2002 ... From 1993 until June, 2002 he was the honorary head of the district authority ...
... Three stars compose a small triangle which mark the head ... The apex is marked by Meissa (Lambda Orionis), a hot blue giant of spectral type O8 III and apparent magnitude 3.54 which lies some 1100 light years distant ...
... a presidential representative democratic republic, where the President of Yemen is the head of state, while the Prime Minister of Yemen (who is appointed by the ... The president is head of state, and the prime minister is head of government ...
... A mace is a blunt weapon, a type of club or virge—that uses a heavy head on the end of a handle to deliver powerful blows ... metal shaft, often reinforced with metal, featuring a head made of stone, copper, bronze, iron, or steel ... The head of a military mace can be shaped with flanges or knobs to allow greater penetration of plate armour ...
Famous quotes containing the word head:
“...there is a difference between being convinced and being stubborn. I’m not certain what the difference is, but I do know that if you butt your head against a stone wall long enough, at some point you realize the wall is stone and that your head is flesh and blood.”
—Maya Angelou (b. 1928)
“I am a lantern—
My head a moon
Of Japanese paper, my gold beaten skin
Infinitely delicate and infinitely expensive.”
—Sylvia Plath (1932–1963)
“It was always startling to discover so plain a trail of civilized man there. I remember that I was strangely affected, when we were returning, by the sight of a ring-bolt well drilled into a rock, and fastened with lead, at the head of this solitary Ambejijis Lake.”
—Henry David Thoreau (1817–1862)