Digestive System

Question 1

What is the foregut?

Answer 1

The first region of the primitive gut tube extending from the esophagus to the proximal duodenum; it gives rise to upper digestive organs.

Question 2

What organs are derived from the foregut?

Answer 2

Esophagus, stomach, proximal duodenum, liver, gallbladder, pancreas, and spleen (functionally associated).

Question 3

What is the midgut?

Answer 3

The middle region of the gut extending from the distal duodenum to the proximal two-thirds of the transverse colon.

Question 4

What organs are derived from the midgut?

Answer 4

Distal duodenum, jejunum, ileum, cecum, appendix, ascending colon, and proximal two-thirds of the transverse colon.

Question 5

What is the hindgut?

Answer 5

The distal portion of the gut extending from the distal one-third of the transverse colon to the upper anal canal.

Question 6

What organs are derived from the hindgut?

Answer 6

Distal one-third of the transverse colon, descending colon, sigmoid colon, rectum, and upper anal canal.

Question 7

What is the function of the foregut?

Answer 7

Digestion and storage of ingested food; begins chemical breakdown of nutrients.

Question 8

What is the function of the midgut?

Answer 8

Absorption of nutrients and water; continued digestion.

Question 9

What is the function of the hindgut?

Answer 9

Water reabsorption, fecal storage, and elimination.

Question 10

Which artery supplies the foregut?

Answer 10

The celiac trunk.

Question 11

Which artery supplies the midgut?

Answer 11

The superior mesenteric artery (SMA).

Question 12

Which artery supplies the hindgut?

Answer 12

The inferior mesenteric artery (IMA).

Question 13

What is the celiac trunk?

Answer 13

A major branch of the abdominal aorta that supplies the foregut and associated organs.

Question 14

At what vertebral level does the celiac trunk arise?

Answer 14

T12.

Question 15

What are the three main branches of the celiac trunk?

Answer 15

Left gastric artery, splenic artery, and common hepatic artery.

Question 16

What does the left gastric artery supply?

Answer 16

The lesser curvature of the stomach and lower esophagus.

Question 17

What does the splenic artery supply?

Answer 17

The spleen, pancreas, and left greater curvature of the stomach (via short gastric and left gastroepiploic arteries).

Question 18

What does the common hepatic artery supply?

Answer 18

The liver, gallbladder, stomach, duodenum, and pancreas via its branches.

Question 19

What are the main branches of the common hepatic artery?

Answer 19

Proper hepatic artery, right gastric artery, and gastroduodenal artery.

Question 20

What does the gastroduodenal artery supply?

Answer 20

The stomach, duodenum, and pancreas.

Question 21

What does the proper hepatic artery divide into?

Answer 21

Right and left hepatic arteries, which supply the liver.

Question 22

What artery usually supplies the gallbladder?

Answer 22

The cystic artery, a branch of the right hepatic artery.

Question 23

What is the superior mesenteric artery (SMA)?

Answer 23

A major branch of the abdominal aorta that supplies the midgut.

Question 24

At what vertebral level does the SMA arise?

Answer 24

L1.

Question 25

What are the main branches of the SMA?

Answer 25

Inferior pancreaticoduodenal artery, jejunal and ileal arteries, middle colic artery, right colic artery, and ileocolic artery.

Question 26

What does the inferior pancreaticoduodenal artery supply?

Answer 26

The distal duodenum and head of the pancreas.

Question 27

What do the jejunal and ileal arteries supply?

Answer 27

The jejunum and ileum via arcades and vasa recta.

Question 28

What does the middle colic artery supply?

Answer 28

The proximal two-thirds of the transverse colon.

Question 29

What does the right colic artery supply?

Answer 29

The ascending colon.

Question 30

What does the ileocolic artery supply?

Answer 30

The ileum, cecum, appendix, and proximal ascending colon.

Question 31

What is the inferior mesenteric artery (IMA)?

Answer 31

A branch of the abdominal aorta that supplies the hindgut.

Question 32

At what vertebral level does the IMA arise?

Answer 32

L3.

Question 33

What are the main branches of the IMA?

Answer 33

Left colic artery, sigmoid arteries, and superior rectal artery.

Question 34

What does the left colic artery supply?

Answer 34

The distal one-third of the transverse colon and descending colon.

Question 35

What do the sigmoid arteries supply?

Answer 35

The sigmoid colon.

Question 36

What does the superior rectal artery supply?

Answer 36

The rectum and upper anal canal.

Question 37

What is the marginal artery of Drummond?

Answer 37

An arterial connection between SMA and IMA along the inner border of the colon providing collateral circulation.

Question 38

What is the significance of the celiac trunk, SMA, and IMA?

Answer 38

They supply the entire gastrointestinal tract from the esophagus to the rectum.

Question 39

Which veins accompany these arteries to drain the gut?

Answer 39

The portal venous system — splenic vein, superior mesenteric vein, and inferior mesenteric vein.

Question 40

Where do these veins ultimately drain?

Answer 40

Into the hepatic portal vein, which carries blood to the liver for processing.