GI Histology I Flashcards
Lip Histology
Stratified squamous epithelium
Basement Membrane
Lamina Propria
What are the three structures derived from epithelial bud?
Enamel Organ
Dental Papilla
Dental Sac
What is dental lamina?
The internal limb
Odontoblasts
Form dentin matrix throughout the life of tooth
Ameloblasts
Forms enamel(hardest substance in body) which covers only tooth crown
Cementoblasts
Differentiated from dental sac cells depositing cementum on dentin. It has coarse collagen fibers in bone-like calcified matrix
What is peridontal membrane?
Highly metabolic connective ttisue
Binds cementum to bony socket
Allows limited movement
Absorbs pressure from mastication
Sulcus terminalis
Separation for anterior two thirds of upper oral portion from posterior one third
Taste Cell Structure
Sustenacular cells and Taste cells
Filliform papillae is the most abundant compared to ____ which has a mushroom like structure. ____ has taste buds unlike ____
Fungiform papillae
Fungiform
Filliform
____ papillae are underdeveloped or rudimentary while ____ has taste buds with ducts of von Ebner’s glands.
Follate
Circumvallate papillae
Mucosa layer of digestive tube
Epithelium, Lamina propria and muscularis mucosa
Submucosa layer of digestive tube
dense, irregular connective tissue
Vascularized
contains nerve plexus
Muscularis externa
Inner circular layer of smooth muscle
Outer longitudinal layer of smooth muscle
Myentric nerve plexus lies between the two layers of muscle tissue
This regulates size of lumen
Regulated rhythmic movement of GI tract
Outermost layer
Serosa and Aventita both with dense irregular CT
