Lab 8: Digestive System Flashcards
Name & Characteristics
Gastro-Esophageal (Cardiac) Sphincter
Characteristics: Cardiac sphincter at junction changes from stratified squamous to simple columnar
Name & Functions
Gastro-Esophageal (Cardiac) Sphincter
Function: Prevents backflow of food into the esophagus
Name & Characteristics
Colon
Characteristics – Divided into four layers- mucosa, submucosa, muscularis externa and serosa. The mucosa is the innermost layer of the gastrointestinal tract that is surrounding the lumen, or space within the tube. This layer comes in direct contact with food (or bolus), and is responsible for absorption and secretion. Mucosa is further divided into epithelium, lamina propria and muscularis mucosae
Name & Function
Colon
Function - submucosa consists of a dense irregular layer of connective tissue with large blood vessels, lymphatic, and nerves. muscularis externa consists of an inner circular layer and a longitudinal outer muscular layer. adventitia consists of several layers of epithelia.
Name & Location
Colon
Location – Large, small intestine, stomach, and esophagus.
Name & Characteristics
Oral Cavity
Characteristics - The oral mucosa is the mucous membrane epithelium of the mouth. It can be divided into three categories.
Masticatory mucosa - keratinized stratified squamous epithelium, found on the dorsum of the tongue, hard palate and attached gingiva.
Lining mucosa - non-keratinized stratified squamous epithelium, found almost everywhere else in the oral cavity.
Specialized mucosa - specifically in the regions of the taste buds on the dorsum of the tongue.
Name & Location
Oral Cavity
Location – Oral Cavity
Name & Characteristics
Crypts of Lieberkuhn
Characteristics: composed of simple columnar cells, goblet cells, DNES, and Paneth cells; tubular glands
Name & Function
Crypts of Lieberkuhn
Function: production of digestive enzymes (e.g. sucrase, maltase, and endopeptidases)
Name & Location
Crypts of Lieberkuhn
Location: small and large intestines
