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8/12/2019 Glands Associated With Digestive-ss
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dr. Susianti, M.Sc
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GENERAL FEATURES
Salivary glands
Parotid
Submandibular
Sublingual
Pancreas
Liver
Gall bladder
A. Components of the System
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DuctsExocrine
Pancreas and liver also have important
endocrine functions
B. Exocrine and EndocrineFunctions
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Liver, pancreas, parotid gland serous
Submandibular, sublingual serous and
mucous
C. Serous and Mucous ExocrineSecretory Glands
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Exocrine glands are structurally and
functionally subdivided by septa
D. Glandular Subunits
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Intralobular ducts
Intercalated ducts
Striated ducts Interlobular ducts
E. Exocrine Ducts
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The majors pairs of glands, the parotis,
submandibular, and sublingual, surroud theoral cavity
Secrete saliva: moistens the food,
lubricates the digestive tract and begins the
enzymatic digestion of carbohydrates
SALIVARY GLANDS
A. General Structure andFunction
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Serous and mucous cells
Serous cells
Mucous cells Myoepithelial cells
Other cells
B. Cell Types
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C. Parotid Glands
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D. Submandibular (Submaxillary)Glands
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E. Sublingual Glands
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Serous
Compound acinar glands
Contains islets of Langerhans
Secrete variety of digestive enzymes
PANCREAS
A. General Structure andFunction
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Photomicrograph showing the
appearance of the acinar portion
of the pancreas with its secretory
cells.
Basal lamina Intercalatedduct Zymogen
egranules
Acinarcells
Centroacinar cells
Schematic drawing of the structure of pancreaticacini. Acinar cells (darker color) are pyramidal, with
granules at their apex and rough endoplasmic
reticulum at the cell base. The intercalated duct partly
penetrates the acini. These duct cells are known as
centroacinar cells (lighter color). Note the absence of
myoepithelial cells.
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1. Zymogene
granules
2. Basophilic
(chromophilic)
1. Alpha cells
2. Beta cells
3. Capillaries
4. Connectivetissue
5. Pancreaticacinus
Pancreatic Acini(Special Preparation) Pancreatic Islets(Special Preparation)
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Largest gland
Glissons capsule
Reticular connective tissue stroma
accompanying the blood vessels as they
penetrate the parenchyma Predominant cell type: hepatocyte
LIVER
A. General Structure
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Liver
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Three dimensional aspect of the normal liver. In the upper center vein; in
the lower center, the portal vein. Observe the bile canaliculus (darker
color), liver plates (lighter color), Heringscanal, Kupffer cells sinusoid, fat-
storing cell, and sinusoidal endothelial cell.
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Have main role in digestion, involves
enzymatic processing.
Detoxification Endocrine gland
Exocrine gland
B. General Functions
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C. Blood Supply
Hepatic portal vein
Hepatic artery
Hepatic sinusoids Central veins
Hepatic veins
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Schematic diagram of a
classic liver lobule. Branches
of the hepatic artery (HA) and
hepatic portal vein (PV) emptyblood into hepatic sinusoids
(S), through which it flow
toward the central vein. The
endothelial lining of the
sinusoids is discontinuous
and is separated from the
radial plates of hepatocytes
by the space of Disse. Bile
canaliculi receive bile from
the hepatocytes that border
them and convey it toward thebile ducts in the portal triads.
The arrows show that blood
and ilea flow in opposite
directions.
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Hepatocytes
Primary structural and functional subunits
Storage gycogens, endocrine functions,production and secretion of bile, detoxification
Kupffers cells
Fat-storing cells
D. Cell Types
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Hepatocytes
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Classic liver lobules
Portal triad
Central vein Hepatocyte plates and hepatic sinusoids
Portal lobule
Hepatic acinus (of Rappaport)
E. Liver Lobules
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Schematic drawing illustrating the
territories of the classic liver
lobules, hepatic acini, and portal
lobules. The classic lobule has acentral vein (CV) and is outlined by
the solid lines that connect the
portal spaces (PS). The portal
lobules (lighter color) have their
centers in the portal spaces; they
are outlined by lines that connect
the central veins (upper triangle).
The portal lobules constitute the
portion of the liver from which bile
flows to a portal space. The hepatic
acinus (darker color) is the regionirrigated by a single distributing
vein (diamond shaped figure).
Zones of the hepatic acinus are
indicated by I, II and III.
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LIVER LOBULE
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Bile Consist of bile acids, phospolipids, cholesterol.
Bilirubin, water, and electrolytes
Billiary tract Narrow bile ductulues (also called cholangioles
or Herings canals)
Hepatic duct
Common bile duct (ductus choledochus)
Sphincter of Oddi
F. Billiary System
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Consist of simple columnar epithelium,
have microvilli
Smooth muscle fibers
GALL BLADDER
A. Mucosa
B. Muscularis
C. Adventitia and Serosa
GALL BLADDER
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GALL BLADDER