• Bacteria vs. Cheek cells

Digestive system - basic principle

Digestive torso Mouth Esophagus Liver Small intestine Large intestine Greater omentum Stomach Teeth

Digestive plaque Anus Rectum Appendix Large intestine Small intestine Spleen Pancreas Liver Gall bladder Lower respiratory system Oral cavity Stomach Esophagus Pharynx Nasal cavity

Digestive head Mouth Tongue Lingual tonsil Epiglottis with epiglottic cartilage Glottis Vocal folds Thyroid cartilage Trachea Esophagus Palatine tonsil Pharynx Laryngopharynx Oropharynx Nasopharynx Internal naris Pharangeal tonsil Opening of the auditory/eustachian tube Inferior nasal concha Middle nasal concha Superior nasal concha Nasal cavity External naris and nasal vestibule

Food pathway External naris - air intake Mouth - food intake Trachea Larynx Esophagus Pharynx Laryngopharynx Oropharynx Nasopharynx Nasal cavity

Salivary glands Sublingual gland Submandibular gland Tongue Nasal cavity Larynx Larynx Submandibular gland Parotid duct Parotid gland

Stomach Serosa Muscularis Mucosa Rugae Duodenum Pyloric sphincter Pylorus Rugae Fundus Lower esophageal sphincter Esophagus Duodenum Pylorus Lesser curvature Greater curvature Fundus Body Cardia Esophagus

Small and large intestines Internal anal sphincter External anal sphincter Anus Rectum Appendix Ileum Cecum Ileocecal valve Ascending colon External anal sphincter Internal anal sphincter Anus Rectum Cecum Appendix Sigmoid colon Taenia coli Descending colon Jejunum Ileum Haustra Ileocecal valve Ascending colon Transverse colon Deodenum Pancreas Spleen Stomach

Liver, gall bladder and pancreas Duodenal major papilla Spleen Tail of the pancreas Body of the pancreas Head of the pancreas Hepatopancreatic ampulla Duodenal minor papilla Pancreatic duct Common hepatic duct Common bile duct Accessory duct Cystic duct Duodenum Gall bladder Liver