Histology Flashcards
How many layers in the wall of GI tract?
4 layers Mucosa Submucosa Muscularis Externa Serosa (adventitia)
Make up of mucosa?
- Epithelium - enterocytes
- Lamina propria- loose connective tissue + GALT
- Muscularis Mucosae- thin smooth muscle
Submucosa description?
Loose connective tissue, submucous plexa (part of the ENS)
Muscularis Externa?
Inner circular layer + outer longitudinal layer, myenteric plexus
Description of serosa/adventitia?`
Connective tissue
What is GALT?
Gut associated lymphoid tissue (part of immune system)
Where is the myenteric plexus?
Between two muscle layers
Diagram of wall of GI tract?
What type of epithelium does the oral cavity, oropharynx, laryngopharynx and tongue have?
Stratified squamous epithelium
Which two sections of the mouth and pharynx have a different type of epithelium an what is it?
- Nasopharynx & nasal cavity
- Respiratory epithelium
4 types of tongue papillae?
Filiform
Fusiform
Fungiform
Vallate
Which tongue papillae has no taste buds?
Filiform
The pharynx house the tonsils what are the different types of tonsils?
- Pharyngeal tonsils (adenoids)
- Palatine tonsil (tonsils)
- Lingual tonsils
- Tubal tonsil
What is the change in epithelium when the stomach begins?
Stratified squamous epithelium to simple columnar epithelium
What is the location where epithelium changes in the stomach?
Gastro-oesophageal junction
