microscopic structure of liver, gallbladder, gall …€¦ · microscopic structure of liver - is...
TRANSCRIPT
![Page 1: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/1.jpg)
Lecture 2 ESS_3rd semester
MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL DUCTS, AND PANCREAS
OVERVIEW OF DEVELOPMENT OF THE ALIMENTARY CANAL
![Page 2: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/2.jpg)
MICROSCOPIC STRUCTURE OF LIVER
- is the largest gland of the body- is of endodermal origin- it consists of the connective tissue, parenchyma, and blood vessels
connective tissue – 2 sites:
- fibroconnective capsule (capsule of Glisson) – on the surface of liver
- interstitial connective tissue within parechyma - is poor in amount distinct is in portal areas (portal canals) – sites where usually meet 3 hepatic lobules
(structural units of the parenchyma)portal areas have triangular shape (triangles of Glisson)
portal area contains triad of Glisson: - interlobular vein (from v. portae) - interlobular artery (from hepatic artery)- bile duct
![Page 3: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/3.jpg)
Parenchyma hepatic lobules (lobules of a central vein) and intrahepatic bile ducts
lobules are polyhedral prisms of 1 to 2 mm high nad wide in cross sections lobules usually show hexagonal profile with a central vein in their centres
![Page 4: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/4.jpg)
hepatic lobule consists of hepatic cell plates (cords of Remak) alternating withsinusoidshepatic cell plates are made up of 1 or 2 rows of hepatocytes among them run bile canaliculi
![Page 5: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/5.jpg)
![Page 6: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/6.jpg)
![Page 7: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/7.jpg)
hepatocytes are mostly polygonal and often binucleate cellsthe cytoplasm is eosinophilic and slightly granular. The plasma membranes of two adjacent hepatocytes are smooth except the surfaces limited the bile canaliculi and perisinusoidal spaces.
![Page 8: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/8.jpg)
hepatic sinusoids = thin vascular channels
d. cca 20 m, length of 500 mor more, branched
empty into a central vein
lined with endothelium + phagocytic Kupffer cells
*
![Page 9: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/9.jpg)
Kupffer cells
![Page 10: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/10.jpg)
bile canaliculidiameter cca 1-2 m
surrounded with plasmalemmas of adjacent hepatocytes
begin blindly near the central vein and run to the periphery of the lobule open intothe canals of Hering
Intrahepatic bile ducts: canalscanals ofof HerringHerringinterlobularinterlobular bilebile ductsducts
![Page 11: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/11.jpg)
![Page 12: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/12.jpg)
Blood circulation of the liver
2 circulations - nutritive one (hepatic artery) - oxygenated bood- functional one (portal vein) - venous blood rich in
absorbed productsdivision of blood streams - 20 to 30 % of blood flows nutritive through circulation
- 80-70 % of blood flows through functional circul.blood of both circulations meets at the level of hepatic sinusoids
hepatic artery interlobular artery interlobular arteriolesproper (portal areas) (surface of hepatic lobules
interlobular interlobular venules HEPATIC SINUSOIDSveins(portal areas) (surface of hepatic lobules
vena portae
hepatic veins sublobular veins central veins
inferior vena cava
Functional circulation
Nutritive circulation
![Page 13: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/13.jpg)
![Page 14: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/14.jpg)
Hepatic lobus (lobule of a central vein)
![Page 15: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/15.jpg)
Concept of a portal lobule
portal lobule - has triangular shapeits centre is formed by a portal area andtissue draining bile into bile duct of that portal area
![Page 16: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/16.jpg)
Zones of hepatic acinus:1. zone of permanent activity2. transient zone3. quiescent zone
Extrahepatic biliary passages
right + left hepatic ductcommon hepatic ductcystic duct
common bile duct (d. choledochus)
gallbladder - 3 layers- mucosa- muscular l.- serous coat (partly also adventitia)
Wall:1. simple columnar epithelium2. lamina basalis3. dense collagen conn. tissue
![Page 17: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/17.jpg)
wall of the gallblader
![Page 18: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/18.jpg)
MICROSCOPIC STRUCTURE OF PANCREAS
- gland of 120 -130 g
- it lies in the concavity of the duodenum (head, body and tail)
- pancreas consists of
a) connective tissue - capsule + septae
b) parenchyma – exocrine + endocrine glandular tissue
lobules - serous acini + ducts
- islets of endocrine cells (islets of Langerhans)
![Page 19: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/19.jpg)
Exocrine pancreas : serous acini + ducts
![Page 20: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/20.jpg)
![Page 21: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/21.jpg)
Endocrine pancreas: islets of Langerhans
A cells, B cells, D cells, PP cells - pancreatic polypeptide
![Page 22: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/22.jpg)
![Page 23: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/23.jpg)
![Page 24: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/24.jpg)
Stomodeum
Oropharyngeal membrane
Primitive gut
foregut
midgut
hindgut
Cloacal membrane
Proctodeum
ventral mesenterium
dorsal mesenterium
OVERVIEW OF DEVELOPMENT OF THE ALIMENTARY CANAL
![Page 25: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/25.jpg)
Frontal view of the alimentary canal (5th week)
![Page 26: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/26.jpg)
Branchial apparatus of the embryo and its fate
![Page 27: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/27.jpg)
Development of pharynx, esophagus and stomach
Pharynx - constitutes after completion of the branchial apparatus development, when process of separation of branchiogenic organs was finished
Esophagus - ventrally proliferates respiratory diverticulum, initially very short, by 7 th week - final length
Stomach - appears as fusigorm dilatation of the caudal part of the foregutis suspended by ventral and dorsal mesogastrium
![Page 28: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/28.jpg)
Stomach5th week - dorsal wall grows rapidly than vetral - major and lesser curvatures
6th week - undergoes rotation movement according to axis:A/longitudinalmajor c. to the left (right side becomes the dorsal sidelesser c. to the right (lect side becomes the ventral side
B/ sagittalcardiac part moves inferiorly
pyloris part moves rather superiorly
![Page 29: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/29.jpg)
Development of the intestine
midgut + hindgut
midgut elongates to form 2 loops:
- duodenal loop - C - shaped
- midgut loop - U - shaped cranial limb caudal limb(jejunoileal) (ileocaecal)
by primitive flexure of the coli
hindgut - precloacal portion- cloaca
Duodenumdevelops from duodenal loop, that rotates around the longitudinal axis to the right,
rotation is connected with dislocation of mesenteries
between the 5th and 6th w. comes to obliteration of the duodenal lumen, recanalization in the 8th w.
![Page 30: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/30.jpg)
Development of the midgut loop
![Page 31: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/31.jpg)
![Page 32: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/32.jpg)
![Page 33: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/33.jpg)
Development of the hindgut
![Page 34: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/34.jpg)
Development of the liver and biliary apparatus
![Page 35: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/35.jpg)
Development of the pancreas
![Page 36: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/36.jpg)
![Page 37: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/37.jpg)
![Page 38: MICROSCOPIC STRUCTURE OF LIVER, GALLBLADDER, GALL …€¦ · MICROSCOPIC STRUCTURE OF LIVER - is the largest gland of the body - is of endodermal origin - it consists of the connective](https://reader033.vdocuments.mx/reader033/viewer/2022042211/5eb329b818dd940d055b6062/html5/thumbnails/38.jpg)