24.3 histology of the digestive tract Flashcards
what is the innermost layer of the digestive tubes?
mucosa
where in the digestive tract would you find stratified squamous epithelium?
mouth
oropharynx
esophagus
anal canal
where in the alimentary canal would you find simple columnar epithelium?
stomach
small intestine
large intestine
what are the layers of the mucosa layer of the alimentary canal?
epithelium
lamina propria
muscularis mucosae
what is the lamina propria and where is it located in the alimentary tract?
loose connective tissue
it is a layer of the mucosa
what is the muscularis mucosae and where is it located in the digestive tract?
a thin layer of smooth muscle
it is a layer of the mucosa
what is the submucosa?
a thick CT layer with nerves, blood vessels, small glands, parasympathetic submucosal plexus
what follows the mucosa and submucosa layers of the alimentary tract? describe it
muscularis layer
2 or 3 layers of smooth muscle cells
how are the layers of smooth muscle cells different in the muscularis layer of the digestive tract?
one layer is circular and one is longitudinal
what part of the alimentary canal is the exception to the muscularis smooth muscle layer?
esophagus, where the upper 1/3 is striated muscule, important in the control of movement
what are the serosa and adventitia?
connective tissue surrounding the smooth muscle layer
what is the serosa called in the digestive tract?
visceral peritoneum
what produces saliva?
compound alveolar salivary glands
what are the 2 fn of saliva?
prevents bacterial infection
lubrication
what does saliva contain that breaks down starches?
salivary amylase
