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The rhinarium (Neo-Latin, "belonging to the nose"; pl.: rhinaria) [1] is the furless skin surface surrounding the external openings of the nostrils in many mammals.Commonly it is referred to as the tip of the snout, and breeders of cats and dogs sometimes use the term nose leather.
A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle , [ 1 ] rostrum , beak or proboscis . The wet furless surface around the nostrils of the nose of many mammals is called the rhinarium (colloquially this is the "cold wet snout" of some mammals).
Rhinogrades are mammals characterized by a nose-like feature called a "nasorium", the form and function of which vary significantly between species. [ 4 ] [ 7 ] According to Stümpke, the order's remarkable variety was the natural outcome of evolution acting over millions of years in the remote Hy-yi-yi islands.
The beak or snout of a vertebrate may also be referred to as the rostrum. Some cetaceans, including toothed whales such as dolphins [7] [8] and beaked whales, have rostrums (beaks) which evolved from their jawbones. The narwhal possesses a large rostrum (tusk) which evolved from a protruding canine tooth.
The human nose is the first organ of the respiratory system. It is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two. The nose has an important function in breathing.
The elephant's trunk and the tapir's elongated nose are called "proboscis", as is the snout of the male elephant seal. Notable mammals with some form of proboscis are: Aardvark; Anteater; Elephant; Elephant shrew; Hispaniolan solenodon; Echidna; Elephant seal; Leptictidium (extinct) Moeritherium (extinct) Numbat; Proboscis monkey; Saiga ...
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The transverse nasal crease or groove is a usually white line between the upper two-thirds and the lower third of the human nose (slightly above the cartilage tip between the bridge and nostrils). It can occur as the result of heredity, accident, or the constant rubbing or wiping of the nose, commonly referred to as the allergic salute. [1] [2]