Structure and Types of Incisors
– Adult humans have eight incisors, two of each type.
– Types of incisors: maxillary central incisor, maxillary lateral incisor, mandibular central incisor, mandibular lateral incisor.
– Children with deciduous teeth also have eight incisors, named the same way as permanent teeth.
Tooth eruption and development determine the number of incisors in young children.
– The order of eruption for primary teeth: mandibular central incisors, maxillary central incisors, mandibular lateral incisors, maxillary laterals.

Incisors in Different Animals
– The number of incisors varies among different animal species.
– Opossums have 18 incisors.
– Armadillos have no incisors.
– Cats, dogs, foxes, pigs, and horses have twelve incisors.
– Rodents have four incisors.

Function of Incisors
– In cats, incisors are small, and meat is bitten off with canines and carnassials.
– Elephants have modified upper incisors as curved tusks.
– Rodents’ incisors grow continuously and are worn by gnawing.
– Human incisors are used to cut off pieces of food and grip other food items.

Additional Images
– Arrangement of incisors in an adult human.
– Mouth (oral cavity).
– Left maxilla. Outer surface.
– Base of skull. Inferior surface.

Related Topics
Canine tooth.
– Molar.
Premolar.
Shovel-shaped incisors.
– References.

Merriam-Webster Online Dictionary
incisor (noun)
a front tooth typically adapted for cutting , especially one of the cutting teeth in mammals located between the canines when canines are present - see tooth illustration
Incisor (Wikipedia)

Incisors (from Latin incidere, "to cut") are the front teeth present in most mammals. They are located in the premaxilla above and on the mandible below. Humans have a total of eight (two on each side, top and bottom). Opossums have 18, whereas armadillos have none.

Incisor
Permanent teeth of the right half of the lower dental arch, seen from above.
The permanent teeth of a human, viewed from the right.
Details
Identifiers
Latindens incisivus
MeSHD007180
TA98A05.1.03.004
TA2906
FMA12823
Anatomical terminology
Incisor (Wiktionary)

English

Etymology

Borrowing from New Latin incīsor, from incīdō (to cut into, cut through) +‎ -tor (-er, -or, agent noun suffix).

Pronunciation

Noun

incisor

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