Exam 3 – Lecture 22: GI 1 Flashcards
What is the GI system?
Lips to the anus
What happens in the GI system?
Ingestion, digestion, absorption, and elimination
Immune surveillance/barrier
What is the GI system like among different species?
Great variation
What is the general layout of the GI system?
Mouth (oropharynx) Esophagus Stomach Intestine (small, large, cecum) Rectum Anus (cloaca)
What are the tunics of the GI system?
Mucosa
Submucosa
Muscularis
Adventitia
What is the mucosa made up of?
Epithelium (lining)
Lamina propria
Muscularis mucosa
What kind of tissue is the submucosa?
Loose areolar connective tissue
What runs in the submucosa?
Blood vessels and lymphatics
Where is stratified squamous epithelium found? Why?
Up high in the tunics
It is the high friction area
What lines the rumen, reticulum, and omasum in ruminants?
Stratified squamous epithelium
What happens to the thickness of the submucosa as you move down the intestine?
It gets thicker (thin up high)
What is the serosal layer?
Peritoneum of the abdomen that is adhered to other connective tissues
What makes up the oral cavity?
Lips Tongue Teeth Tonsils Salivary glands
What are the lips?
Mucocutaneous junction
What happens at the mucocutaneous junction?
Keratinized squamous epithelium meets non-keratinized squamous epithelium
Describe the tongue
Skeletal muscle that is haphazardly arranged
Where are tonsils located?
In the caudal portion of the oropharynx
What kind of epithelium is the tongue?
Stratified squamous epithelium
What can be found on the tongue?
Papillae
Taste buds
What are sublingual glands?
Surround the taste bud
Make saliva and other digestive things
What are the 2 main layers of a tooth?
Crown
Root
What makes up the crown of a tooth?
Enamel (outer most surface)
Dentin
Pulp (inner most portion)
What makes up the root of a tooth?
Cementum
Dentin extension
Pulp extension
Central canal/nerve
Which part of the tooth is visible?
Crown
