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Tapir (tapirus terrestris) snout showing flehmen.

The snout, or muzzle, is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw.

[edit] Terminology

The term "muzzle", used as a noun, can be ambiguous. It can refer both to the protruding part of the face itself, and also to a type of apparatus placed over the protruding part to prevent the animal from biting or eating, often used before and after horse races or to control dogs. See animal muzzle for the latter meaning.

The wet, naked surface around the nostrils of the nose is known as the rhinarium (colloquially this is the "cold wet nose" of some animals). The rhinarium is often associated with a stronger sense of olfaction.^{[citation needed]}

[edit] Snout of dogs

The muzzle begins at the stop, just below the eyes, and contains the dog's nose and mouth. In the domestic dog, most of the upper muzzle contains organs for detecting scents. The loose flaps of skin on the sides of the upper muzzle that hang to different lengths over the mouth are called flews. The snout is considered a weak point on most animals, because of its structure an animal can be easily stunned or even knocked out by applying sufficient force.

It is innervated by one of the twelve pairs of cranial nerves. These nerves start in the brain and emerge through the skull to their target organs. Other destinations of these nerves are eyeballs, teeth and tongue.

The muzzle shape of a domestic dog ranges in shape depending upon the breed, from extremely long and thin (dolichocephalic), as in the Rough Collie, to nearly nonexistent because it is so flat (extreme brachycephalic), as in the Pug. Some breeds, such as many sled dogs and Spitz types, have muzzles that somewhat resemble the original wolf's in size and shape, and others in the less extreme range have shortened it somewhat (mesocephalic) as in many hounds.

Dolichocephalic (long and thin head shape) Afghan Hound

Mesocephalic (medium length head shape) English Cocker Spaniel

The extreme brachycephalic snout of the Pug

Black and Tan Coonhound snout, showing the flews overhanging the lower jaw.

[edit] Snout of other mammals

Asian Elephant (Elephas maximus indicus). The extended proboscis is called the "trunk", and is used for a wide range of purposes including feeding, drinking, exploration, and social grooming.

This section requires expansion.

[edit] Snout of invertebrates

Some freshwater and marine (for example Eustrombus gigas) gastropods have snout.

[edit] References

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