ANATOMY OF BILIARY APPARATUS - kimsmedicalcollege.orgkimsmedicalcollege.org/clinical/biliary...

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ANATOMY OF BILIARY APPARATUS Dr.Nagaraj.S Asst.Professor, Anatomy Dept. KIMS,Narketpally

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 ANATOMY  OF  BILIARY  APPARATUS

Dr.Nagaraj.SAsst.Professor,Anatomy Dept.KIMS,Narketpally

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                            INTRAHEPATIC  BILIARY APPRATUS

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Intrahepatic biliary apparatus

•  Bile canaliculi

•  Canals of Herring

•  Bile ductules

•  Right and Left hepatic ducts

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Bile canaliculi form a polygonal network around individual liver cells(except those surface of the cells which are related to sinusoids)

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The canaliculus is formed by the separation of plasma membranes of the adjacent liver cells.

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In the peripheral part of hepatic lobules canaliculi unite to form canals of Hering .

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At the porta hepatis the arrangement of the structures from before backwards is DUCTARTERYVEIN

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EXTRAHEPATIC  BILIARY  APPARATUS

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Common hepatic duct 

•  3cm long 

•  2mm in calibre

Relations

Behind: Portal vein

Left side: Principal hepatic Artery

Below and to the right : cystic duct 

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                       Gall  Bladder

     A.  Location:

1.  Epigastric region 

2.  Right hypochondriac region 

3.  On inferior surface of liver 

4.  Between quadrate and right lobes         

B.  Pear‐shaped, hollow structure 

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Location of Gallbladder

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C.  Fundus slants inferiorly, to the right

D. Attached to liver by loose (areolar)connective tissue

E.  Peritoneum covers free surfaces

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Peritoneum covering the gall bladder

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                                           Relations 

Infront:   Anterior abdominal wall                  just below the tip of 9th costal cartilage

Behind :  Transverse colon

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            Fundus of GB:  

1.  may be palpated

2.   in angle between lateral border of            right rectus abdominis and costal margin

3.  At level of elbow

4.  Most anterior visceral structure

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      GB must be distended with bile to be clearly visualized

                  

           Phyrigian Cap  

  Anatomical variation

  Fund is is folded back on itself

  not pathological

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                                    Body of Gallbladder

      Relations

Above :  Visceral surface of liver                Deep branch of cystic artery and corresponding vein in the                    connective tissue

Below: transverse colon and 1st part of duodenum

       Right side:  hepatic flexure of colon

       Left side : Pyloric part of the stomach 

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             Fossa for Gall Bladder

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 Hartmann’s Pouch

1.  Infundibulum of gallbladder

2.  Lies between body and neck of gallbladder

3.  A normal variation

4.  May obscure cystic duct 

5.  If very large, may see cystic duct arising from pouch

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         Neck of gallbladder 

   ‐  S shaped 

   ‐ at first passes upwards and forwards then turns          abruptly downwards and backwards

       ‐ continuous with cystic duct

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Characterized by a spiral valve (of Heister)

 

Cystic Duct

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• Does not have any valvular function.

• makes catheterization difficult

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1.   joins common hepatic duct 

2.  superior and posterior to pylorus of stomach

 Cystic duct

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          Common Bile Duct 

1.  10‐15 cm long 

2.  Courses through lesser omentum 

3.  Deep to pyloric sphincter 

4.  Narrow tube, 1‐2 mm diameter

5.  Should be no more than 6 mm in diameter 

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6. May be 8‐10 mm in post‐cholecystectomy patients

7.  Normally has smooth walls

8.  Joins with pancreatic duct

9.  On L.S., convergence is seen a.  anterior to portal veinb.  posterior to head of pancreas

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       Supraduodenal (1st) part of CBD has: 

        1. hepatic artery on left and portal vein posterior

       2. descends in free margin of lesser omentum

   Retroduodenal (2nd) part of CBD 

J. runs parallel to gastroduodenal artery

K.  

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                     Infra duodenal part of CBD 

  Infront : head of pancreas, accessory pancreatic duct, anterior                        row of vasa recta of duodenum

          Behind : Posterior row of vasa recta of duodenum

          Left side : superior mesentric and portal veins

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Combined duct of CBD and main pancreatic duct empties into duodenum at ampulla of Vater

           Intra duodenal part of CBD

           Length:  2cm

           Ampulla:  5mm

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Gaurded by Sphincter of Oddi

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    Sphincter of oddi:

.  Sphincter of Oddi guards duct, regulates bile flow

1.   Closed:  bile goes into gallbladder

2.   Open:  bile goes into duodenum

Regulates bile flow, prevents back flow, and diverts bile into G.B.

Basal resting pressure of 13 mm Hg above duodenal pressure.

 CCK causes relaxation

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Ruggero Oddi

Described the Sphincter of Oddi while a student

Inflammation of the sphincter of Oddi is called odditis

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Arterial supply

•  the cystic artery

•  pancreatico duodenal artery • the right hepatic artery

•  accessory cystic artery

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   1.  Cystic artery 

a.  arises (~ 60% of the time) from right hepatic

         b.  passes posterior to hepatic duct, then divides

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c.  Superficial branch, to peritoneal surface of GB

d.  Deep branch, to hepatic surface of GB

e.  May be doubled or tripled

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                 Variations in arterial supply:

• In 50 % of population from Right hepatic artery

• from SMA (20%)

• 2 right hepatic arteries (5%)

• Cystic artery can arise from left hepatic, common hepatic, gastroduodenal, or SMA(10%). 

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Small arteries supplying CBD 

   a.  arise from cystic artery 

   b.  posterior branch of superior pancreatico‐duodenal artery

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Venous drainge

• Tributaries of hepatic veins

• Cystic  veins 

• Portal vein

• Many small veins drain directly into the liver

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      Lymphatic drainage of GB

1. Terminate at celiac nodes

2. Cystic node at neck of GB

a.  Actually a hepatic node

b.  Lies at junction of cystic & common hepatic ducts

3.  Other lymph vessels also drain into hepatic nodes 

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Nerve supply

• Cystic plexus

•  Parasympathetic nerves‐motor to gallbladder  and bile ducts ‐inhibitory to sphincters

• Phrenic nerve (C4)

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 sympathetic T7‐ T9

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DEVELOPMENT

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       Anomalies:

The classic description applies only in one third of the patients

G.B: abnormal portions, intrahepatic, rudimentary, or           duplicated.

Bile ducts: duct of Luschka, accessory right hepatic duct.

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    G.B Function:

Store  and concentrate bile.

Secrete glycoprotein and hydrogen ion.

Contraction stimulated by CCK and vagus nerve and inhibited by sympathetic stimulation, VIP,  and somatostatin

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       Gallbladder Diseases

      1.  Cholecystitis = inflammation of GB

2.  Cholelithisis = Stone(s) in GB

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THANKU