Flashcards in Histiology Deck (67)
what is the histology of oral cavvity, oropharynx and laryngopharynx?
what is the histology of the nasal cavity and nasopharynx?
what is the histology of the anterior 2/3 of the tongue?
stratified squamous epithleium
thin on ventral surface
thick and with papillae on the dorsal surface
what is the histology of the posterior 1/3 of the tongue?
- covered by smooth stratified squamous epithlium
- circumvalllate papillae lacks papillae but does have a substantial lymphoid aggregates in the mucosa
what are the 4 types of tongue papillae?
which tongue papillae has no tastebuds
what is the oropharynx made up of anatomically?
- ring of lymphoid tissue composed of palatine tonsils, lingual tonsils, tubal tonsils and pharyngeal tonsils (adenoids)
from the oesophagus to the anal cavity, what is the digestive tract histologically composed of?
1. mucosa = epithelium, lamina propria and muscularis mucosae
3. muscularis externa
4. serosa/ adventitia
what does the epithelium sit on?
what is the lamina propria?
loose connective tissue
what is the muscularis mucosae?
thin layer of smooth muscle
what is the submucosa?
loose connective tissue
what is muscularis externa?
two thick layers of smooth muscle ,an inner circular layer and an outer longitudinal layer
what is the serosa/adventitia?
outer layer of connective tissue that either suspends the digestive tract or attaches it to other organs
where can you find a mucosa above a submusoca?
what is the gastro-oesophageal junction?
- junction from stratified squamous epithelium of oesophagus to simple columnar epithelium of the cardia of the stomach
where are gastric pits and gastric glands found?
in stomach epithelium
gastric pits = at top
gastric glands = at bottom
what are gastric pits line by?
surface mucous cells
- secretes mucus which protects the lining of the stomach
what is the isthmus?
the junction ebtween gastric pits and gastric glands
what cells make up the isthmus?
parietal cells and stem cells
what is the neck in the stomach epithelium made up of?
muscous cells nad partieal cells
what is the fundus (base) of the stomach epithelium made of?
chief cells, few paritetal cells and nterendocrinecalles (neuroendocrine cells)
what is a chief cell?
digesting enxyme secreting cell
what is a parietal cell?
hydrocholic acid producing cell
what are the gastric pits like in the cardia of the stomach?
deep gastric pits that branched into loosely packed tortuous glands
what are the gastric pits like in the body of the stomach?
shallow gastric pits with long gastric glands
what are the gastric pits like in the pylorus of the stomach?
deep gastric pits with branches, coiled gastric glands at a higher density than in the cardia
what is the extra layer in the muscularis externa of the stomach?
the layer is oblique to the usual circular and longitudinal muscle layers and is located internal to the circular layer
what is the gastroduodenal junction?
transition from the stomach mucosa to duodenal mucosa
it is an inner, circular layer of smooth muscle is markedly thickened to form the pyloric sphincter