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Dentition (Teeth) of Mammals B. Sc. II

Dentition (Teeth) of Mammals B. Sc. II. Mrs. S.M. Jaunjal Department of Zoology GKG College Kolhapur. Hard and pointed structure connected to jaw bones in buccal cavity is called teethes. Arrangement of teeth in upper and lower jaw is called Dentition.

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Dentition (Teeth) of Mammals B. Sc. II

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  1. Dentition (Teeth) of MammalsB. Sc. II Mrs. S.M. Jaunjal Department of ZoologyGKG College Kolhapur

  2. Hard and pointed structure connected to jaw bones in buccal cavity is called teethes

  3. Arrangement of teeth in upper and lower jaw is called Dentition

  4. Dentition is highly specialized in mammals except

  5. Primary function of teethes

  6. Importance of Dentition

  7. Differenation or shape of teeth

  8. Homodont / isodont Ex- Whales, dolphins, porpoies and armadillos etc Function- Prevent the escape of the struggling of fishes

  9. Heterodont

  10. Attachment of teeth

  11. Succession of teeth

  12. Monophyodont moles

  13. Examples

  14. Kinds of teeth

  15. Incisors teeth

  16. Front teeth by premaxillae in upper and dentaries in lower jaws

  17. Single rooted, monocuspid and long

  18. Curved and Sharp Chisel like Edges Ex- Rodents Cutting, biting and Gnawing

  19. Sloth bear (incisors totally absent)

  20. Canines

  21. Single, occur in half of each jaw, outside the incisors,upper canine is first teeth of maxillae

  22. Elongated, single rooted and with sharp conical monocuspid crown

  23. Piercing and tearing the flesh of prey

  24. offence and defense

  25. Diastema

  26. Premolar and molar Cheek teeth / grinders

  27. And Premolar Broad surface with ridges and tubercles

  28. Difference

  29. Carnassial teeth In carnivorous animals, last premolar of upper jaw and first molar of lower jaw is very sharp cups. For cracking bones and shearing tendons

  30. Wisdom Teeth

  31. Types

  32. Tricodont teeth Three cones are arranged in linear series Ex- Mesozoic mammals (Extinct mammals)

  33. Trituberculate teeth Three cones, arrange in trianges Ex- Fossil Mammals

  34. Bunodont Crown- Rounded, small, separate tubercles for crushing Found- mammals and mixed diet animals Ex- Man, dog, pig etc

  35. Secodont Sharp cutting edges For tearing and cutting flesh Found in carnivorous animals

  36. Ex - Dog Last upper premolar and first lower molar are large and sharp cutting edges They bite on each other like scissors for cutting flesh Also called cranassial teeth, shearing, sectorial teeth

  37. Selenodont teeth Crown of these teeth bears vertical crescentric cups of hard enamel Ex- Grazing animals for grinding the food Two Types

  38. Elongated Prism shaped High crown Low roots Normal teeth Low-crowned With short tooth Ex- Grazing animals (horse and cattle) Ex- Ground Squrial

  39. Lophodont Intricate folding of Enamel and Dentine Cups are connected by transverse ridges called loops. Ex- elephant Single large 30 cm x 10 cm Present half of each jaw Adapted to grind all sorts of plants and grasses

  40. Dental formula

  41. Number of teeths in different species, but number of teeth are constant and characteristic of same species • Number and kind of teeth I mammals represented by the formula called dental formula • It represent each type of teeth present in half of the jaw • Teeth of upper jaw paced in numerators and those of the lower jaw as denominator • Kinds of teeth are denoted by initial letters-i, c, pm and m respectively • Number of teeth present in the dental formula multiplied by the two gives total number of teeth in a species.

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