Everything about Incisor totally explained
Incisors (from Latin
incidere, "to cut") are the first kind of
tooth in
heterodont mammals. They are located in the
premaxilla above and mandible below.
Function
In many
herbivorous or
omnivorous mammals, such as the
human and the
horse, they're adapted for shearing sharply. In
cats, the incisors are small and don't do much; biting off meat is done with the
canines and the
carnassials. In
elephants, the upper incisors are modified into curved
tusks, just as is the case with
Narwhals, where normally one of them develops into a straight and twisted tusk. The incisors of
rodents grow throughout life and are worn by gnawing.
Number and types of incisors
In humans
Humans normally have eight (8) incisors, two of each type. The types of incisors are:
In animals
Among other animals, some other
primates, cats and horses have twelve. The
rodents have four. Rabbits and hares (
lagomorphs) were once considered rodents, but are distinguished by having eight--1 small pair, called "peg teeth" is directly behind the most anterior pair.
Additional images
Image:Illu mouth.jpg|Mouth (oral cavity)
Image:Gray157.png|Left maxilla. Outer surface.
Image:Gray187.png|Base of skull. Inferior surface.
Further Information
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