BIOM 4070 Study Guide - Final Guide: Stratified Squamous Epithelium, Muscular Layer, Muscularis Mucosae

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 4070
• Professor: Brenda L Coomber

Document Summary

Lamina propria: loose ct, physical attachment, immune protection, mucosal glands. Muscularis mucosa: varying amount of smooth muscle, wave cilia. Physical support, blood vessels, nerve plexus and ganglia, submucosal glands. Layers of smooth or skeletal muscle: one inner circumferential (around tube) and one longitudinal (length of tube) Churning, peristalsis, form sphincters, nerve plexus and ganglia. Serosa: prevents adhesion and allows movement, mesothelium (membrane that lines body cavities) Villi: finger-like folds in mucosal layer projecting into lumen. Plicae: permanent folds into lumen of mucosa and submucosa. Extramural glands (liver and pancreas): secrete enzymes, bile salts, water, ions. Physical protection: stratified squamous epithelium (may be keratinized), mucus to protect from ph. Mucosa: stratified squamous non-keratinized, loose ct, discontinuous smooth muscle (muscularis mucosa gets thicker as you move down esophagus) Muscularis externa: transition from skeletal (voluntary) to smooth (involuntary) as control changes, myenteric plexus between muscle layers, upper sphincter prevents air from entering, lower sphincter prevents gastric reflux.