L31: Digestive System #2 Flashcards
Role of parietal peritoneum?
- lines inner surface of body wall
- attached to abdominal and pelvic walls
- secretes peritoneal fluid and stores fat
visceral peritoneum is wrapped around the organs within what space?
intraperitoneal space
role of mesenteries and what do they contain?
- folds of peritoneum that support the intraperitoneal GI tract organs
- contains vessels, nerves and lymphatics
What are intraperitoneal organs?
- suspended into peritoneal cavity
- CONTAIN mesenteries
- movable
what are retroperitoneal organs?
- NOT suspended into peritoneal cavity
- LACK mesenteries
- immobile
what kind of organs are the pancreas, kidneys, duodenum, ascending and descending colon?
retroperitoneal organs
unpaired organs get blood supply from?
unpaired blood vessels
organs above transverse mesocolon get blood supply from?
celiac trunk
organs below transverse mesocolon get blood supply from?
mesenteric arteries
organs located on the right side of mesentery get blood supply from?
superior mesenteric artery
organs located on left side of mesentery get blood supply from?
inferior mesenteric artery
what is the celiac trunk?
- branch of abdominal aorta
- supplies all organs located intraperitoneally and above the transverse mesocolon
why does the celiac trunk only supply superior parts of pancreas and duodenum?
- both organs are located above and below transverse mesocolon
the superior mesenteric artery supplies?
- right side of mesenterium
ascending and transverse colon, small intestine, parts of pancreas and duodenum
inferior mesenteric artery supplies?
- left side of mesenterium (descending and sigmoid colon, upper parts of rectum)
what secretes the cholecystokinin peptide hormone?
duodenum and jejunum
what is the largest visceral organ
the liver
function of liver
- secretion
- hematological regulation
- metabolic regulation
what is the largest blood reservoir
liver (25% of cardiac output)
what kind of blood does the hepatic portal vein contain
nutrient rich, oxygen poor blood
what kind of blood does the hepatic artery proper contain
oxygen rich blood
what are the 2 supplies to the liver
- hepatic portal vein
- hepatic artery proper
how much do portal veins contribute of blood volume in the liver?
75% (rich in nutrients, poor in oxygen)
how much blood volume does the hepatic artery contribute to the liver
25% (rich in oxygen, poor in nutrients)
when does the blood from the portal veins and the hepatic artery mix ?
as it enters and passes through a liver lobule
when the blood from the portal veins and hepatic artery mix, what is it collected by?
- hepatic central vein
- carries 100% of blood out of liver and into inferior vena cava
what is the falciform ligament in the liver?
peritoneal fold that secures the liver to the abdominal wall
what is the round ligament of the liver?
remnant of the fetal umbilical vein
what does the lesser omentum contain?
veins/arteries of the liver and stomach
- bile duct
function of gallbladder?
concentrates bile produced by liver and stored until needed for digestion (40-60 mls)
what connects the gallbladder to the common bile duct?
cystic duct
endocrine function of pancreas?
- production of insulin and glucagon (regulate blood glucose levels/ secreted in blood stream)
exocrine function of pancreas?
- production of pancreatic juice
parasympathetic/ sympathetic activity in the pancreas?
parasympathetic: stimulates pancreatic juice secretion
sympathetic: inhibits pancreatic juice secretion
