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Peritoneum > SMA and IMA > Flashcards

SMA and IMA Flashcards

1
Q

Targets of the SMA

A

Pancreas, duodenum, jejunum, ileum, cecum, appendix, ascending colon, transverse colon

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2
Q

Which part of the pancreas is retroperitoneal?

A

All of it except the tip of the tail

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3
Q

What is the relationship of the SMA and SMV to the pancreas

A

They pass over the uncinate process

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4
Q

Where do pancreatic duct and common bile duct merge

A

Hepatopancreatic ampulla

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5
Q

Where does the accessory pancreatic duct empty?

A

The minor duodenal papilla

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6
Q

What is the function of the duodenum?

A

Major site of chemical digestion because this is where chyme mixes with pancreatic juice and bile

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7
Q

What part of the duodenum is intraperitoneal?

A

The superior proximal portion

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8
Q

What are the four segments of the duodenum?

A

Superior, descending, horizontal, and ascending

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9
Q

Hepatoduodenal ligament

A

In addition to containing the portal triad, it anchors the superior portion of the duodenum to the liver

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10
Q

Suspensory muscle

A

Anchors ascending portion of duodenum to the diaphragm. Controls flow from duodenum to jejunum

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11
Q

Internal anatomy of superior duodenum

A

smooth wall because of duodenal ampula

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12
Q

Internal anatomy of the rest of the duodenum

A

Has folds of mucosa called plicae circulares

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13
Q

What is the relationship of the horizontal portion of the duodenum to the SMA and SMV

A

The SMA and SMV pass over the horizontal/transverse portion

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14
Q

Blood supply to pancreas

A

Pancreatic arteries from splenic artery
Superior pancreaticoduodenal arteries from gastroduodenal artery
Inferior pancreaticoduodenal arteries from superior mesenteric artery

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15
Q

Venous drainage of the pancreas

A

Pancreatic veins drain to splenic vein; pancreaticoduodenal veins drain to SMV

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16
Q

Lymphatics of pancreas

A

Pyloric nodes, or celiac nodes. Then into cistern chyli

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17
Q

Parasympathetic innervation of pancreas

A

Vagal trunks, autonomic plexuses

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18
Q

Sympathetic innervation of pancreas

A

Greater splanchnic nerve, celiac ganglion, autonomic plexuses

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19
Q

Function of small intestine

A

Majority of nutrient absorption

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20
Q

Is ileum and jejunum intra or retroperitoneal?

A

Intraperitoneal

21
Q

Mesentery Proper

A

Anchors the ileum and jejunum to the posterior wall

22
Q

Blood supply of ileum and jejunum

A

Superior mesentery artery runs in mesentery proper. It gives intestinal arteries that form anastomotic arcades and then give off vasa recta to supply the intestines directly.

23
Q

Superior mesenteric vein

A

receives all blood from small intestines and delivers to hepatic portal vein

24
Q

What is special about the blood draining in the superior mesenteric vein from the ileum and jejunum?

A

It’s very high in nutrient content!!!

25
Q

Differences in jejunum and ileum

A

Jejunum is larger diameter, ileum has smaller diameter
Jejunum has very tall plicae circulares, ileum has Peyer’s Patches
Jejunem has very few and large arcades, ileum has small, numerous arcades
Jejunum has long vasa recta, ileum has short vasa recta

26
Q

Function of large intestines

A

Absorption of water, vitamins; stores and compacts waste

27
Q

Hepatic flexure

A

Right flexure between the ascending and transverse colon

28
Q

In what space does the ascending colon lie

A

the right paracolic gutter, which has more communication than the left because the left is stopped by the phrenicocolic ligament

29
Q

In what space does the descending colon lie?

A

The left paracocolic gutter

30
Q

Splenic flexure

A

Left flexure between transverse and descending colon

31
Q

Dividing line between midgut and hindgut

A

About 2/3 of the way across the transverse colon

32
Q

Taenia Coli

A

Longitudinal muscle of the colon

33
Q

Plicae semilunares

A

Gather colon into pouches called haustra. Semilunares are the folds on the inside

34
Q

Blood supply to large intestine from SMA

A

ileocolic arteries, right colic artery and middle colic artery

35
Q

Marginal artery

A

Anastomotic loop between ileocolic, right and middle colic arteries and between middle and left colic arteries

36
Q

Venous drainage of midgut

A

All venous drainage of midgut follows arteries of the same name and drains into the SMV which merges with splenic vein to form hepatic portal vein

37
Q

Lacteals

A

Lymphatics of midgut. They carry all dietary fats. These drain to the superior mesenteric nodes, then continue into cisterna chyli

38
Q

Parasympathetic innervation of midgut

A

Parasympathetic vagal trunk

39
Q

Sympathetic innervation of midgut

A

Thoracic splanchnic nerve (mostly lesser splanchnic)–> superior mesenteric ganglion.

40
Q

Blood supply to hindgut from IMA

A

Left colic artery, sigmoid arteries, superior rectal artery

41
Q

Location of sigmoid colon (intra or retro)

A

Intraperitoneal

42
Q

Venous drainage of hindgut

A

Veins follow same name as arteries and drain to the inferior mesenteric vein which typically drains to splenic vein

43
Q

Sympathetic innervation to hindgut

A

From lumbar splanchnic nerve (L1-L2) to inferior mesenteric ganglion

44
Q

Parasympathetic innervation to hindgut

A

Pelvic Splanchnic nerves from S2, 3, and 4

45
Q

Plicae circulares

A

Folds of mucosa in the duodenum that increase surface area for absorption

46
Q

Inferior pancreaticoduodenal artery

A

Branch to pancreas coming directly off the SMA

47
Q

Epiploic appendages

A

Fat filled pockets coming off of the taenia coli

48
Q

intermesenteric plexus

A

blending of pelvic splanchnic preganglionic nerves and postganglionic sympathetic nerves.

Peritoneum (9 decks)

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