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Let’s continue our USMLE Review with Anatomy from the Gold Standard USMLE Step 1 Audio Review program.
Play USMLE Audio MP3 03 15 Anatomy Small Intestine 6 Below
Begin 03 15 Anatomy Small Intestine 6 Transcription
Let’s look at the blood supply of the duodenum.
What two main trunks from the abdominal aorta, one from above and one from below, supply bothth e duodenum and the pancreas?
- From above, the celiac trunk and from below, the superior mesenteric artery.
What are the first two steps in the branching pattern from the celiac trunk coming down to reach the duodenum and the pancreas?
- First we have the common hepatic off the celiac trunk and then off the common hepatic we have the gastroduodenal artery.
Coming up from below to the duodenum and pancreas what artery do we have coming from the superior mesenteric artery?
- The inferior pancreaticoduodenal artery.
And the inferior pancreaticoduodenal artery splits into two branches, what are they?
- The anterior and posterior inferior pancreaticoduodenal branches.
All right, let’s go back to the gastroduodenal off of the common hepatic off the celiac trunk branched is the gastroduodenal artery first give off to supply the first portion of the duodenum?
- The supraduodenal artery.
What artery comes off the gastroduodenal artery next that follows inside the curve of the duodenum and also supplies the pancreas?
- The posterior superior pancreaticoduodenal artery.
Next two tiny arteries come off the gastroduodenal artery and supply the posterior portion of the first portion of the duodenum, what are these?
- These are the retroduodenal arteries.
Next, what is the next branch off the gastroduodenal artery that follows the curve again of the duodenum on the inside supplying both the duodenum and the pancreas except this one passes anterior to the head of the pancreas?
- This is the anterior superior pancreaticoduodenal artery.
And of course what is the relationship between the posterior superior pancreaticoduodenal artery to the head of the pancreas?
- It follows the inside curve od the duodenum posterior to the head of the pancreas.
Now these two branches from the gastroduodenal artery, the posterior and anterior superior pancreaticoduodenal arteries follow the inside curve of the duodenum on in front of the pancreas and one behind, and anastomose along the top of the horixontal section of the duodenum with two arteries coming from the other direction.
What are these two other arteries that they anastomose with?
- The anterior and posterior inferior pancreaticoduodenal arteries.
And these anterior and posterior inferior pancreaticoduodenal arteries are off of what main artery?
- They are front the superior mesenteric artery.
Whose origin is deep to what organ?
- Deep to the pancreas.
And then finally just to review, the gastroduodenal artery continues after the anterior superior pancreaticoduodenal artery comes off as what terminal branch?
- The right gastroepiploic artery.
Which supplies what?
- The lower part of the antrum of the pylorus of the stomach.
All right lets look at the blood supply to the rest of the pancreas. The head of the pancreas is of course to the right of midline inside the curve of the duodenum.
What three parts of the pancreas cross to the left ending near the spleen?
- The neck, the body and the tail.
Now the blood supply to the neck the body and the tail are branches from what artery?
- The splenic artery.
And where does the splenic artery come from?
- The celiac trunk.
Now these arteries that we’re going to talk about coming into the pancreas from the splenic artery all join together via some conduits inside the pancreas but for the sake of this discussion we’ll talk about where they enter the pancreas.
What branch comes off the base of the splenic artery where it leaves the celiac trunk and enters the neck of the pancreas from the posterior aspect?
- This is the dorsal pancreatic artery.
And what artery enters the body of the pancreas further to the left?
- The great pancreatic artery.
And where does the great pancreatic artery come from?
- About midway to the left from the splenic artery.
And what two arteries enter the tail of the pancreas on the left hand side from the splenic artery just before it supplies the spleen?
- The caudal pancreatic arteries.
Now what artery runs the length of the pancreas and connects the caudal pancreatic arteries, the dorsal pancreatic artery and the anterior superior pancreaticoduodenal artery?
- The inferior pancreatic artery.
There is another arterial loop within the pancreas that also connects the dorsal pancreatic artery and the caudal pancreatic arteries to the other pancreatic artery in between them.
What is that other pancreatic artery in between them?
- The great pancreatic artery.
All right we’ll come back to the pancreas later, for now we’ll continue with the small intestines and then the colon and then we’ll come back to the pancreas and liver.
****END OF TRANSCRIPTION****
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