1. WARM UP 4/11 1. What is mastication? 2. What are the functions of the tongue? 3. What is the thing hanging in the back of our throat called? 4. What is digestion? 5. What is the muscle that makes up the lips? 6. What are the 3 pairs of salivary glands?

2. NOTES 4/11 Teeth and Mouth

3. TEETH Organs of mastication Organs of mastication Break down food physically into small bits Break down food physically into small bits

4. 3 parts 1. Crown – top part; covered with enamel *hardest substance in the body 2. Neck – middle part; surrounded by gums (gingiva) 3. Root – bottom part NECK

6. PULP CAVITY Center of the tooth Center of the tooth Made of connective tissue, blood and lymph vessels, and sensory nerves Made of connective tissue, blood and lymph vessels, and sensory nerves

7. DENTITION DECIDUOUS – baby teeth (20) DECIDUOUS – baby teeth (20) - shed between 6-13 years old - shed between 6-13 years old PREMANENT – adult teeth (32) PREMANENT – adult teeth (32) - wisdom - 17 years - wisdom - 17 years

8. PERIODONTITIS (gingivitis) – inflammation of the gums DENTAL CARIES – cavities or tooth decay

11. DENTITION TOOTHDEC.PERM. CENTRAL INCISORS 22 LATERAL INCISORS 22 CANINES22 PREMOLARS04 1 st MOLARS 22 2 nd MOLARS 22 3 rd MOLARS 02 TOTAL PER JAW 1016 TOTAL2032

12. DIGESTION STARTS IN THE MOUTH Food physically broken down (chewing) Food physically broken down (chewing) Food chemically broken down – saliva Food chemically broken down – saliva

13. SALIVARY GLANDS FUNCTION –secrete saliva and start to break down starches about 1 liter a day! about 1 liter a day!

14. PAROTIDSSUBMANDIBULARSUBLINGUAL 3 PAIRS

16. PHARYNX (throat) From mouth to esophagus – 5” long From mouth to esophagus – 5” long Opening in back of throat Opening in back of throat 1. For air 1. For air 2. For food passage 2. For food passage 3. For phonation (sounds) 3. For phonation (sounds)

17. BOLUS – rounded mass of food Swallowing moves bolus from mouth to esophagus EPIGLOTTIS – flap that covers the trachea when swallowing; prevents food from entering

18. ESOPHAGUS Collapsible tube about 10” long Collapsible tube about 10” long From pharynx to stomach From pharynx to stomach Posterior (behind) the trachea (windpipe) and heart Posterior (behind) the trachea (windpipe) and heart Thick mucus protects lining from injury

19. PERISTALSIS – involuntary wavelike motion that moves food down esophagus PERISTALSIS – involuntary wavelike motion that moves food down esophagus