Histology of Digestive Glands

University:
American Career College
Course:
MICR112 | General Microbiology
Academic year:

2020
Views:

226

Pages:

28
Author:

Callie Nielsen

IISTILIIY IF IIIESTIIE GLANDS DIGESTIVE GLANDS CONSIST OF: SALIVARY GLANDS LIVER GALL BLADDER PANCREAS SALIVA SALIVA INCLUDES WATER, ENZYMES, IGA, MUCOUS, IONS PRIMARY SALIVA MANUFACTURED BY ACINAR CELLS IS ISOTONIC WITH PLASMA SECONDARY SALIVA IS ALTERED BY STRIATED DUCT CELLS SALIVA HAS PROTECTIVE EFFECT ON ORAL CAVITY TISSUES PARTICIPATE IN TASTE SENSATION IGA, LACTOFERRIN, LYSOZYME HAVE DIFFERENT ROLE AGAINST ANTIGENS AND MICROORGANISMS Saliva secretion is controlled by autonomic nerves Sympathetic stimulation = sparse thick saliva Parasympathetic stimulation = copious, watery saliva SALIVARY GLANDS THERE ARE MANY MINOR SALIVARY GLANDS SCATTERED THROUGHOUT ORAL MUCOSA AND THREE PAIRS OF MAJOR SALIVARY GLANDS THREE PAIRS OF MAJOR SALIVARY GLANDS ARE: SUBMANDIBULAR GLANDS SUBLINGUAL GLANDS PAROTID GLANDS     SECRETORY PORTION & DUCTS 6 Serosa acini 7 Mucosa acini Mucous cells are cuboidal or pyramidal Mucous cells have a heterochromatic basal flattened nucleus Apical cytoplasm is pale or blue/purple 8 9 Mixed acinus = Serous demilune 10 Myoepithelial cells 11 INTERCALATED DUCT STRIATED DUCT : SECRETE FLUID AND IONS, BASOLATERAL MEMBRANE FOLDED WITH NA – ATPASE PUMP, INTRALOBULAR DUCTS INTERLOBULAR DUCTS (EXCRETORY DUCTS) PAROTID GLAND THE LARGEST SALIVARY GLAND BUT PRODUCE 30% OF SALIVA ALL SEROUS CELLS, AFTER 40 YEAR OF AGE ADIPOSE TISSUE INVADED THE GLAND 13 PAROTID GLAND 14 FIGURE 16-3 Copyright © McGraw-Hill Companies SUBMANDIBULAR GLAND ♥EXTENSIVE CONNECTIVE TISSUE CAPSULE AND ABUNDANT SEPTA ♥BRANCHED TUBULOACINAR GLAND PRODUCE 60% OF SALIVA ♥MUCOUS AND SEROUS ACINI; MUCOUS ACINI WITH LIMITED NUMBER OF SEROUS DEMILUNES ♥ABOUT 80% OF CELLS ARE SEROUS (BASOPHILIC) 16 17 FIGURE 16-6 Copyright © McGraw-Hill Companies SUBLINGUAL GLAND IT IS VERY SMALL THAT PRODUCE 5% OF TOTAL SALIVA GLANDS INVESTED BY SCANT CT CAPSULE BRANCHED TUBULOACINAR GLAND MOSTLY MUCOUS CELLS IN ACINI WITH SOME SEROUS DEMILUNES 19 FIGURE 16-5 Copyright © McGraw-Hill Companies PANCREAS PANCREAS PANCREAS IS A MIXED EXOCRINE AND ENDOCRINE GLAND THIN CAPSULE WITH SEPTA BETWEEN LOBULES EXOCRINE = SEROUS ACINI  ENDOCRINE = ISLETS OF LANGERHANS SCATTERED ENDOCRINE PANCREAS A cells 20%:Glucagon B cells 70%: Insulin D cells : Somatostatin F cells(PP cells): Pancreatic Polypeptid DUCTS OF PANCRASE CENTROACINAR CELLS OCCUPY THE LUMEN OF THE ACINI, THESE CELLS ARE BEGINNING OF THE DUCT SYSTEM INTERCALATED DUCTS INTRALOBULAR DUCTS INTERLOBULAR DUCTS