AskDefine | Define incisors

User Contributed Dictionary

English

Noun

incisors
  1. Plural of incisor

Extensive Definition

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 are adapted for shearing sharply. In cats, the incisors are small and do not 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)
incisors in Min Nan: Mn̂g-khí
incisors in Catalan: Dent incisiva
incisors in Czech: Řezák
incisors in German: Schneidezahn
incisors in Spanish: Incisivo
incisors in Esperanto: incizivo
incisors in French: Incisive
incisors in Indonesian: Gigi seri
incisors in Italian: incisivo
incisors in Dutch: Snijtand
incisors in Japanese: 切歯
incisors in Polish: Siekacz
incisors in Portuguese: Incisivo
incisors in Slovenian: Sekalec
incisors in Serbian: Секутићи
incisors in Chinese: 門齒
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