Ch 12 - Digestive System (unfinished)

Professor Frank @ UCF

Ceca

evaginations/outpocketings of the digestive tube

Who has their digestive organs and lungs sharing a cavity?

fish, amphibians, and some reptiles have these organs in the pleuroperitoneal cavity

Who has a abdominopelvic/peritoneal cavity?

birds, mammals, and some reptiles have this cavity to separate digestive organs and lungs

Accessory organs

lay outside of GI tract and release their products into the GI tract through ducts

Tunics of alimentary canal walls

tunica mucosa, tunica submucosa, tunica muscularis, and tunica serosa

Tunica mucosa

innermost layer with 3 layers itself

Layers of tunica mucosa

epithelium, lamina propria, and muscularis mucosa

Epithelium of mucus membrane

simple columnar along bulk of tube for absorption and stratified squamous in esophagus and anal canal for protection

Lamina propria

well vascularized areolar c.t. that provides tunica mucosa with blood supply and connects layer to muscularis

Muscularis mucosa

smooth muscle sheet that throws GI tube into folds; underneath mucus membrane

Tunica submucosa