1. Digestive System
ChaPTER 17

2. Basic Structure Alimentary Canal  Donut Hole 4 Layers:
Mouth & Pharynx
Esophagus
Stomach
Small Intestines
Duodenum
Large Intestines – Colon
Accessory Organs
Salivary Glands
Pancreas
Liver & Gall Bladder
4 Layers:
Mucosa  Mucus
Lubrication & Protection
Secretion and Absorption
Submucosa
Vessels and Nerves
Muscularis
Peristalsis
Circular layer and longitudinal layer
Serosa  Serous Fluid

3. Basic Function Digestion – breakdown of food
Mechanical & Chemical
Enzymes
Absorption – first time food actually enters body/blood stream
Villi & Microvilli
Excretion – removal of undigestible material
Feces formation
Add’l function:
Vitamin production

4. Mouth Lips, Cheeks, Gums, Teeth and Tongue
Frenulum  tongue “tied” & Frenotomy
Gums  Gingivitis
Tonsils – Palatine & Pharengeal (Adenoids)
20 Deciduous (Baby) Teeth
Incisor, Incisor, Canine, Molar, Molar
32 Permanent (Adult) Teeth
Incisor, Incisor, Canine, Biscupid, Bicuspid, Molar, Molar, Molar
Wisdom Teeth – 3rd set of molars
Impacted
Parts of a tooth
Crown vs. Root
Enamel
Cementum, peridontal ligament, alveolar process

5. Salivary Glands Hard & Soft Palates Salivary Amylase  Starches
Parotid largest
Submandibular  Gleeking
Sublingual  Mucus
Hard & Soft Palates
Create Bolus
Raise Uvula
Initiate Swallowing

6. Pharynx & Esophagus Swallowing Reflex  initiate Peristalsis
Epiglottis Closes – directs food to esophagus
Esophagus – collapsable tube that connects pharynx to stomach
Lots of mucus
Esophageal hiatus  hiatal hernia
Lower esophageal sphincter
Acid reflux