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The Oral Cavity--- a.k.a. ________MOUTH_____________ • The Saltine Cracker Challenge! •Digestive System •Video Major Functions of the Mouth 1. 2. 3. 4. Initial analysis Mech. process Lubrication Limited Digestion ** But NO absorption of nutrients PARTS! 1. lips = labia 2. vestibule =space between cheeks and teeth 3. gingiva = gums Can be paplated... 4. hard palate = most anterior roof of mouth Can be paplated... 5. soft palate = posterior roof of mouth 6. uvula = hangs in back 7. Tongue helps… a. Mech. Processing… ( compression) b. Assists in chewing c. detects senses like touch/ temp/ taste d. secretes mucus and the enzyme lipase which breaks down lipids More Parts…. 8. frenulum = attaches tongue to floor of cavity 9. 3 pairs of Salivary Glands secrete 1 – 1.5L of saliva a day; pH = 7; 99.4 % water (0.6 % ions and amylase which begins absorption of carbs. A. Parotid ( ear) B. Sublingual ( under tongue) C. Submandibular (posterior to teeth--- secretes Amylase) 10. Teeth perform Mastication = chewing ( which breaks down connective tissue of meat and fiber in plants a. dentin = like bone ( non-living) b. pulp cavity = blood and nerves c. root canal = narrow tunnels @ base/ root of tooth d. crown = visible part covered with enamel Problems of the Oral Cavity 1. 2. 3. 4. 5. 6. gingivitis = bacteria in gums plaque = sticky matrix of food/ bacteria tartar = hard calcified plaque dental caries = cavities root canal = removal of all bacteria in canal impacted wisdom tooth = not enough room or out of place ** Floss daily to remove bacteria that a toothbrush can’t get to 4 Main Types of Teeth w/diff. functions 1. 2. 3. 4. incisors = cut/ clip… in front cuspids (canines) = tear and slash bicuspids (premolars) = crush/ mash/ grind molars = crush/ grind Dental Succession 1. Deciduous = primary/ milk/ baby 20 2. Permanent = secondary/ adult 32 3. Third molars = wisdom teeth On a white sheet of paper…. • Draw, color, label and title Fig. 15.5 pg. 406– include the names of teeth from Fig. 15.8 pg. 407 • Draw, color, label and title Fig.15.9 pg. 408 • Staple this paper to your Digestive Drawing from earlier this week… due tomorrow!