Categories: Lesson Notes

SS2 Biology Lesson Note on Mammalian Teeth

The website has the complete lesson note for all the subjects in secondary school but this piece showcases the SS2 Biology Lesson Note on Mammalian Teeth. You can use the website search button to filter out the subject of interest to you.

CLICK HERE to download the complete Document: DOWNLOAD HERE

MAMMALIAN TEETH

The type of teeth possessed by a mammal is related to the type of food it eats. The number, arrangement and conformation of teeth in an organism are referred to as its dentition. When all the teeth are the same shape and size as in fishes, amphibians and reptiles it is called homodont dentition. When they differ in shape as in dogs, man and rabbits it is heterodont dentition.

Mammals usually have four different types of teeth namely the incisors, canines, premolars and molars. Man has two sets of teeth during his lifetime; the milk teeth when young and the permanent teeth when mature. There are 20 milk teeth and 32 permanent teeth.

Types of Teeth

  1. Incisors – These are flattened, chisel-like with a sharp edge for cutting and holding onto the food/prey. They are located in the front of the jaw.
  2. Canines – These have sharp, pointed tips and are used for tearing flesh. They are next to the incisors.
  3. Premolars – These have broad ridged surfaces called cusps. They are used for grinding and chewing food. They are located towards the back of the jaw.
  4. Molars – These also have broad, ridged surfaces and are used for chewing and grinding food. They are found at the extreme back of the jaws.

Dental Formula

This refers to the number, type and arrangement of teeth in one half of each jaw.

Example in;

  • Man; I 2/2 ; C 1/1 ; PM 2/2 ; M 3/3
  • Dog; I 3/3 ; C I/I ; PM 4/4 ; M 2/3
  • Rabbit; I 2/1 ; C 0/0 ; PM 3/2 ; M 3/3

Structure of a Tooth

A typical tooth has three parts; the crown, the neck and the root. The crown is the part above the gum. The root is embedded in the jaw and the neck is the part on the same level with the gum, it is the narrow junction between the crown and root.

The incisors and canines have one root each while the premolars and molars have two or three roots each.

Click on the Downloadable Button to get the FULL NOTE

Sunday

Share
Published by
Sunday
Tags: Lesson Note

Recent Posts

List of Universities Offering Veterinary Medicine in Nigeria

Veterinary medicine is the branch of medicine that deals with the prevention, diagnosis, and treatment…

3 months ago

List of Universities Offering Anthropology in Nigeria

Anthropology is the scientific study of human beings and their cultures. It encompasses a wide…

3 months ago

List of Universities Offering Sociology in Nigeria

Sociology is the scientific study of human society, culture, and behavior. It examines the social…

3 months ago

List of Universities Offering Social Work in Nigeria

Social Work is a profession dedicated to helping individuals, families, and communities to cope with…

3 months ago

List of Universities Offering Religious Studies in Nigeria

Religious studies is an academic discipline that explores the beliefs, practices, and history of various…

3 months ago

List of Universities Offering Public Administration in Nigeria

Public administration is the field of study and practice that focuses on the organization and…

3 months ago