BPK 205 Lecture Notes - Lecture 32: Myenteric Plexus, Pancreatic Juice, Abdominal Cavity

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 205
• Professor: Nadine Wicks

Document Summary

Objectives: describe the basic anatomy of the gastrointestinal (gi) tract. Sphincter (ues), lower esophageal sphincter (les), pyloric sphincter (pyl), ileocecal sphincter (ileo), internal/external sphincter (int/ext) Accessory glands/organs: salivary gland, liver, gallbladder, pancreas: name the layers and functions of the gi tract wall (int ext) mucosa, submucosa, muscularis externa, serosa. Submucosa = loose connective tissue with nerve trunks, blood/lymph vessels (+ submucosal. Muscularis externa = outer wall; 2 layers of smooth muscle cells (inner circular for constriction, outer longitudinal for shortening of tract) + myenteric plexus between 2 muscle layers (+ oblique layer for stomach) Serosa = outer covering; continuous with peritoneal membrane that lines abdominal cavity; secretory epithelium + connective tissue layers; lubricates + protects + suspends gi tract. Stomach = smooth, wrinkled, extra submucosal plexus vs small intestine = many villi: briefly describe the main gi tract processes. Secretion = movement of material from cells into lumen or ecf.