Snout
Rostrum
Definition
The snout (or rostrum) refers to the anterior extremity of the nose, formed by the apex of the nose and the upper lip.
Its shape and appearance, as well as the form of the nostrils, vary greatly between species. In Equids, the rostrum forms a very mobile, finely haired appendage. In Cattle, the rostrum constitutes the muzzle (nasolabial plane), a broad, hairless, and moist surface; in Pigs, it is called the snout (rostral plane); and in Carnivores, the rhinarium (nasal plane), hairless and generally pigmented.
In domestic mammals, this region is generally devoid of a clear separation between these two parts, unlike in humans, where the apex of the nose is distinct from the upper lip.
References
Barone R. Anatomie comparée des mammifères domestiques, Tome 3, Splanchnologie I, 4th edition, Vigot, Paris, 2017.
