PHGY 210 Study Guide - Final Guide: Pylorus, Gastric Mucosa, External Anal Sphincter

• School: McGill University
• Department: Physiology
• Course: PHGY 210
• Professor: Tomoko Takano

Document Summary

Git structure: worms: git elongated, hollow tube stretching from anterior (mouth) to posterior (anus), communication with external environment at both ends, humans: git grows and differentiates over time, growth. Growth occurs in 2 different places: extensive elongation, growth of internal surface area of lumen, differentiation. Unlike worms (simple tube), humans differentiate and develop gut into different specialized organs. Mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus. Specialized organs are more capable of doing different functions optimizes functions of git. Accessory organs also important (ex: liver, pancreas, salivary glands): gut wall. Serosa: thin, tough layer of connective tissue (most external layer) Submucosa: second layer of connective tissue; contains submucosal plexus (nerve cells), blood vessels and lymphatic vessels. Mucosa: inner layer of epithelial cells containing secretory (endocrine and exocrine) and absorptive cells. Striated muscle (ex: voluntary) at top of git (mouth, pharynx, upper 1/3 of esophagus) and at external anal sphincter.