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":
... 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 ...
... Manfred Hugo is the full-time Landrat (head of the district authority) since the 1st of July, 2002. 1993 until June, 2002 he was the honorary head of the district authority ...
... democratic republic, where the President of Yemen is the head of state, while the Prime Minister of Yemen (who is appointed by the President) is the head of government ... The president is head of state, and the prime minister is head of government ...
... 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 ...
... type of club or virge—that uses a heavy head on the end of a handle to deliver powerful blows ... consists of a strong, heavy, wooden or 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:
“As I stand over the insect crawling amid the pine needles on the forest floor, and endeavoring to conceal itself from my sight, and ask myself why it will cherish those humble thoughts, and hide its head from me who might, perhaps, be its benefactor, and impart to its race some cheering information, I am reminded of the greater Benefactor and Intelligence that stands over me the human insect.”
—Henry David Thoreau (18171862)
“I cant make head or tail of Life. Love is a fine thing, Art is a fine thing, Nature is a fine thing; but the average human mind and spirit are confusing beyond measure. Sometimes I think that all our learning is the little learning of the maxim. To laugh at a Roman awe-stricken in a sacred grove is to laugh at something today.”
—Wallace Stevens (18791955)
“If I were as I once was, the strong hoofs crushing the sand and the shells,
Coming out of the sea as the dawn comes, a chaunt of love on my lips,
Not coughing, my head on my knees, and praying, and wroth with the bells,
I would leave no saints head on his body from Rachlin to Bera of ships.”
—William Butler Yeats (18651939)