teeth press press by MikeJenny

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									                                  Diversity in Dentition
 For the Cow, the Human and the Dog you must explain the teeth and jaw structure
       including the facial muscles and how these features relate to what it eats.
You must be specific and fully explain the structures and their function. You then need
       to discuss how these structures relate to it’s lifestyle in terms of nutrition.
                              Your presentation must include:
 Detailed diagrams of each (drawn diagrams are fine and can be scanned easily) with
                                     labelled structures
 An explanation of each of the structures/muscles and their function for EACH animal
 An essay type discussion as to how these structures are designed to help it survive.
 This presentation must be in your own words and uploaded onto your website when
completed. Feel free to use any software package you feel necessary. You can even
  use publisher and make it as a poster. Then it can go on the net and on the wall!
  Remember: Diversity means DIFFERENCES so make sure you are focussing on
                       different structures – how are they unique?
Teeth Structure   Muscle Structure
                    Human Mastication
Mastication in humans is controlled through the four main muscles of
  mastication. These are the lateral pterygoid, medial pterygoid,
 temporalis, and masseter muscles. These allow the jaw to move
      fowards and backwards, up and down, and side to side.
   Human teeth resemble the herbivore structure more than the
carnivore one. Each row has 2 pairs of insisors followed by a pair of
    canines, followed by several pairs of molars and premolars.
   These adaptions allow for the human hebivoric nature, as the
   canines help to tear the meat, the molars help grind plant and
  vegatable matter, and the insisors are used for snipping things.
Teeth Structure   Muscle Structure
                    Cow Mastication
 The structure of teeth in the cow is specifically designed for
     eating grass. The horny pad with the row of incisors
 underneath help the cow crop the grass, so it can get it into
    the mouth. From then there is a row of flat molars and
  premolars. These are designed to slide across each other,
 thus breaking down the grass, to be stored in the cow’s first
stomach, until it is chewed up again later, in the shade. (Cud)

 The predominate jaw muscles in the cow are the masseter
 and the pterygoid muscles. These used together allow the
  cow to perform the side to side motion of it’s jaw which
                grinds up the grass it eats.
Teeth Structure   Muscle Structure
                         Canine Mastication
  The dog’s teeth are designed for it’s carnivorous lifestyle. The four main
 canine teeth, and most of the others (molar and premolars) are sharp and
   designed for ripping and shredding the meat the dog eats. They curve
           inwards a little to help the dog hold it’s prey in place.

 The dog’s main jaw muscle is the Temporalis muscle. This muscle is so big
that it takes up most of the space in the jaw structure. As this muscle moves
 the jaw only up and down, the dog is to a large part unable to move it’s jaw
                      back and forwards, or side to side.

 The jaw and tooth function of the dog allows it to easily eat meat. Which is
fantastic, as it is a carnivore. The up and down movement allows it to tear at
            the meat, with it’s jagged teeth helping to rip the meat.




                                                  (This is not canine
                                                  mastication)
 Pictures Used:
 http://www.smallpawsrescue.org/pup3/teethrosalyn.jpg
 whyfiles.org/shorties/147tooth/
 http://whyfiles.org/shorties/147tooth/images/teeth.jpg
 http://www.tpub.com/content/medical/14274/img/14274_49_1.jpg
 http://www.wonderquest.com/2006-09-05-cow-jaw.jpg
 http://upload.wikimedia.org/wikibooks/en/c/c3/Anatomy_and_ph
 ysiology_of_animals_Dogs_skull.jpg
 http://www.parks.sa.gov.au/publish/groups/public/@parks/@upp
 ersoutheast/documents/all/005454.gif
 http://www.parks.sa.gov.au/publish/groups/public/@parks/@upp
 ersoutheast/documents/all/005453.gif
Teeth Structure                                Muscle Structure
 http://www.myspacecomedy.com/images/funny/dog-mouth.jpg

								
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