Digestive Histology Flashcards
What are the three types of hepatic lobule organizations?
Classic
Portal
Liver Acinus
What is the location of the portal triad?
Angles of classic lobule
Portal Triad
3 features: interlobular bile duct, interlobular vein and interlobular artery
Classic lobule
central venule is in the center of lobule….portal triads are at the angles
Portal lobule
Three central venules of adjacent lobules form a triangle
Portions of the bile canaliculi of the three lobules drian into same bile duct
Liver Acinus lobule
Includes three zones defined by hepatic tissue receiving blood from a branch of hepatic artery conducting blood to opposite central veins
Metabolic gradient extends from hepatic triad to central vein
Pancreas histology
lobulated
compound
tubulo-alveolar
Secretory Functions: exocrine and endocrine
Connective tissue support that dividing into lobules with divisions by septas
Intercalated ducts
Lined with low cuboidal cells
Cells with receptors for secretin
Secrete water and bicarbonate ions
Pancreatic Acinus
Pyramidal serous cells
Precursor of pancreatic juice enzymes
Centroacinar
Form truncated cuboidal epithelium within the lumen of acini
Unique to pancreas*
No striated ducts or myoepithelial cells
What stimulates release of digestive enzymes from serous accinar cells?
CCK
Secretion of bicarbonate ions and water is regulated by ____
secretin
A-cells or ____ have
alpha cells have fine cytoplasmic granules and presumed to form glucagon
B cells or ____ have
beta cells have cytoplasmic granules. More numerous and produce insulin
D cells or ___ have
delta cells secrete somatostatin helping to control levels of insulin and glucagon
