The small intestines - jejunum and ileum

Question 1

where is the jejunum and ileum located?

Answer 1

distal 2 parts of small intestines

Question 2

where does the jejunum and ileum lie?

Answer 2

intraperitoneal (within the peritoneal cavity)

Question 3

what is the jejunum and ileum attached to? by what?

Answer 3

attached to the posterior abdominal wall by mesentery (a double layer of peritoneum)

Question 4

where does the jejunum begin?

Answer 4

duodenojejunal flexure

Question 5

is there a clear distinction between the jejunum and ileum?

Answer 5

There is no clear external demarcation between them jejunum and ileum, although the two parts do have some differences

Question 6

where does the ileum end?

Answer 6

ileocecal junction

Question 7

what happens at the ileocecal junction?

Answer 7

the ileum invaginates into the cecum to form the ileocecal valve

Question 8

what is the function of the ileocecal valve?

Answer 8

it prevent reflux of material back into the ileum

Question 9

can the ileocecal valve control movement of material from ileum to the cecum?

Answer 9

Although it is not developed enough to control movement of material from the ileum to the cecum

Question 10

where is the jejunum located?

Answer 10

upper left quadrant

Question 11

what is a characteristic feature of the jejunum wall?

Answer 11

thick intestinal wall

Question 12

what colour is the jejunum?

Answer 12

red

Question 13

what are characteristic features of the jejunum?

Answer 13

1. longer vasa recta (straight arteries)

2. less arcades (arterial loops)

Question 14

where is the ileum located?

Answer 14

mainly in the lower right quadrant

Question 15

what is a characteristic feature of the ileum wall?

Answer 15

thin intestinal wall

Question 16

what colour is the ileum?

Answer 16

pink

Question 17

what are characteristic features of the ileum?

Answer 17

1. shorter vasa recta (straight arteries)

2. more arcades (arterial loops)

Question 18

what are the sources of arterial supply to the initial part of duodenum?

Answer 18

gastroduodenal artery

Question 19

what is the gastroduodenal artery a branch of?

Answer 19

celiac trunk

Question 20

what is the arterial supply to the distal to the major duodenal papilla?

Answer 20

inferior pancreaticodudenal artery

Question 21

what is the inferior pancreaticodudenal artery a branch of?

Answer 21

superior mesenteric artery

Question 22

why is the transition form the initial to the distal to major duodenum important?

Answer 22

it parts the change from the embryological foregut to midgut

Question 23

where do the veins of the duodenum travel? and where does it drain into?

Answer 23

The veins of the duodenum follow the major arteries and drain into the hepatic portal vein

Question 24

where does the arterial supply to the jejunoileum (jejunum and ileum) come from?

Answer 24

superior mesenteric artery

Question 25

where does the superior mesenteric artery arise from? where is it located?

Answer 25

from the aorta at the level of the L1 vertebrae, immediately inferior to the celiac trunk

Question 26

where does the superior mesenteric artery travel? what happens as it travels?

Answer 26

It moves in between layers of mesentery, splitting into approximately 20 branches

Question 27

what happens to the branches of the superior mesenteric artery?

Answer 27

These branches anastomose to form loops, called arcades

Question 28

what happens to the arcades?

Answer 28

From the arcades, long and straight arteries arise, called vasa recta

Question 29

which vein drains the jejunoileum?

Answer 29

The venous drainage is performed by the superior mesenteric vein.

Question 30

which vein drains the jejunoileum?

Answer 30

The venous drainage is performed by the superior mesenteric vein

Question 31

what does the superior mesenteric vein join with? where does it join and what does it become?

Answer 31

It unites with the splenic vein at the neck of the pancreas to form the hepatic portal vein