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.