HUBS192 Lecture Notes - Lecture 23: Stratified Squamous Epithelium, Muscularis Mucosae, Exocrine Gland

• School: University of Otago
• Department: Human Body Systems
• Course: HUBS192
• Professor: Greg Jones

Document Summary

Tube modified; oesophagus and stomach looks different, essential tube is the same. Began as outgrowths of the primitive gut: accessory organs: liver/pancreas. Only have 4 basic tissues to use: connective, muscle, nervous and epithelial tissue. Epithelial (sheet/layer) cells joined together to form a layer; lines body cavities (e. g. lining peritoneal cavity, lined by serous squamous epithelium/peritoneal membrane); also forming glands of gi system. Connective: framework, underlies any epithelium (always); gives strength to structure; adheres epithelia to subjacent structures. Nervous: mini-brain in gut; enteric nervous system (controls processing and movement); quite independent of our central nervous system. Arrangement of upper most cells (only look at the top first layer) Shape: squamous (simple squamous serous secreting epithelium), cuboidal (involving secretion and in the duct system which delivers secretory product )or columnar (lining small intestine) Stratified epithelium: structure underneath needs to be protected; get a lot of wear and tear (oral cavity, oesophagus)