Lecture 23 Large intestine and Liver Flashcards

1
Q

what does the large intestine consist of?

A
  • Cecum

* Colon

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2
Q

the colon of the LI is divided into 4 parts what are they?

A
  • Ascending
  • Transverse
  • Descending
  • Sigmoid
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3
Q

the Ascending and descending colon of LI are?

A

retroperitoneal

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4
Q

the Transverse and sigmoidal colon of LI are?

A

intraperitoneal

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5
Q

what does the Ileocecal Valve do?

A

Regulates the passage of material into the cecum

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6
Q

whats the appendix?

A
  • Reserve of LI bacteria population
  • Variety of locations
  • Inflammation = appendicitis
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7
Q

whats Barium enema?

A

enables x-ray image to be taken of LI to assess function

no backflow into the ileum

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8
Q

whats included in the gross structure of the LI?

A

Teniae Coli:

Haustra:

Omental appendices:

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9
Q

whats Teniae Coli?

A
  • Modification of Muscularis layer
  • 3 bands of longitudinal smooth muscle
  • Stronger contraction
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10
Q

whats Haustra?

A

• Series of pouches in the wall of colon

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11
Q

whats Omental appendices?

A

• Sacs of fat

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12
Q

is there lots or little villi in LI?

A

lack of villi

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13
Q

in the gut tube, the Mucosa invaginates to form what?

A

intestinal glands

the muscularis mucosae does not invaginate

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14
Q

what does the mucosa consists of?

A
  • Epithelium
  • Lamina propria
  • Muscularis mucosae
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15
Q

whats the function of the mucosa of the colon?

A

Water and salt absorption

Goblet cells produce mucous (protection and lubrication)

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16
Q

whats the rectum?

A
  • Anal columns mark boundary where epithelium changes.

* Before this point: simple columnar

17
Q

whats the epithelium of the anal canal?

A

stratified squamous

18
Q

what are the 2 anal sphincters?

A

internal anal sphincter

external anal sphincter

19
Q

whats the internal anal sphincter?

A

smooth muscle (under involuntary control)

20
Q

whats the external anal sphincter?

A

skeletal muscle (under voluntary control)

21
Q

whats Defecation Reflex?

A

• Movement of faeces into rectum stimulates stretch receptors

• Internal anal sphincter relaxes
(involuntary)

• Conscious decision to defecate – external anal sphincter relaxes

22
Q

summary of LI

A
  • Mucosa invaginated into glands
  • Significant number of mucous secreting cells.
  • Lack of villi
  • Longitudinal muscle layer in 3 bands (Teniae coli)
23
Q

summary of anal canal

A
  • Sphincters important for control

* Stratified Squamous epithelium

24
Q

where is the liver located?

A

• Superior right quadrant of abdominopelvic cavity

25
Q

whats the main function of liver?

A

• Produce bile – stored in the gall bladder

26
Q

how much cardiac output does the liver receive?

A

~25%

27
Q

whats the liver blood supply?

A
  • ~25% CO
  • 1/3 from hepatic artery
  • rest is venous blood from hepatic portal vein
28
Q

what kind of blood is from hepatic portal vein?

A

venous blood

  • Nutrient rich, deoxygenated blood from SI
  • Processed by hepatocytes
29
Q

where does the hepatic portal vein, the hepatic artery, and the bile duct travel within?

A

lesser omentum

30
Q

what does the liver structure consist of?

A

Lobules (functional units)
rows of hepatocytes
between rows liver sinusoids
Portal triad

31
Q

what do hepatocytes do?

A

produce bile

32
Q

wheres Liver sinusoids?

A

between rows, bile canaliculi between cells.

33
Q

what makes up the portal triad?

A
  • Branch of hepatic artery
  • Branch of hepatic portal vein
  • A bile duct
34
Q

whats the flow of blood and bile in liver?

A
  1. Blood flows towards central vein
  2. Processed by hepatocytes, which produce bile
  3. Bile secreted into canaliculi, travels to bile duct
35
Q

whats the venous drainage of the liver?

A

Central veins drain into hepatic vein which drains into inferior vena cava

36
Q

where does bile travel to?

A

gall bladder, where it is stored and concentrated

37
Q

what does the bile duct join?

A

pancreatic duct at hepatopancreatic ampulla