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| 7905026996 | Digestive Tract | - Long muscular tube extending from mouth to anus (approximately 30 ft) - Mouth, pharynx, esophagus, stomach, small intestine, and large intestine | 0 | |
| 7905032660 | Accessory organs | - Teeth, tongue, salivary glands, liver, gallbladder, and pancreas | 1 | |
| 7905039721 | Mucosa | -innermost layer - Epithelium; lamina propria; muscularis mucosa | 2 | |
| 7905049449 | Muscularis externa | - Inner circular layer; outer longitudinal layer | 3 | |
| 7905055686 | Serosa (visceral peritoneum) | - Areolar tissue; mesothelium | 4 | |
| 7905066832 | Adventita | Fibrous connective tissue layer found in parts of digestive tract that lack serosa | 5 | |
| 7905076363 | MUCOSA Inner Epithelium | Simple columnar in most of digestive tract - Stratified squamous from mouth through esophagus, and in lower anal canal | 6 | |
| 7905083071 | MUCOSA Lamina Propria | loose connective tissue layer | 7 | |
| 7905089899 | MUCOSA Muscularis Mucosa | thin layer of smooth muscle - Tenses mucosa creating grooves and ridges that enhance surface area and contact with food - Improves efficiency of digestion and nutrient absorption | 8 | |
| 7905101578 | Mucosa-associated lymphatic tissue (MALT) | Abundance of lymphocytes and lymphatic nodules located throughout the mucosa | 9 | |
| 7905108893 | Submucosa | thicker layer of loose connective tissue - Contains blood vessels, lymphatic vessels, submucosal nerve plexus, and mucus-secreting glands | 10 | |
| 7905118790 | Muscularis Externa | produces contractions to propel food and residue through the tract (motility) | 11 | |
| 7905128099 | MUSCULARIS EXTERNA (2 levels of muscle) | Inner circular layer: forms valves (sphincters) that regulate the passage of material through the tract • Outer longitudinal layer | 12 | |
| 7905135776 | MUSCULARIS EXTERNA Myenteric nerve plexus | between muscle layers | 13 | |
| 7905150456 | Serosa | membrane layer (visceral peritoneum) - Covers the lower esophagus, stomach, intestines, liver | 14 | |
| 7905157083 | Adventita | fibrous connective tissue layer - Covers parts of digestive tract where serosa is absent - Pharynx, most of the esophagus, and rectum | 15 | |
| 7905168608 | Enteric Nervous System (ENS) | present in esophagus, stomach, and intestines; regulates digestive tract motility, secretion, and blood flow | 16 | |
| 7905181465 | ENS Networks of Neurons (2) | - Submucosal (Meissner) plexus: - Myenteric (Auerbach) plexus | 17 | |
| 7905193494 | Submucosal (Meissner) plexus | - in submucosa; controls glandular secretion of mucosa and movements of muscularis mucosae | 18 | |
| 7905199626 | Myenteric (Auerbach) plexus | - parasympathetic ganglia and nerve fibers between layers of muscularis externa; controls peristalsis and other contractions | 19 |