Small Intestine Flashcards
How long is the duodenum
10 inches (25 cm) long
What type of peritoneum in the duodenum:
Mostly retroperitoneal. Except 1st part
1st part- intraperitoneal
How many parts of the duodenum
4
First part of the duodenum
duodenal bulb (cap)
duodenum first part hase a pyloric orifice to the:
Gall bladder
Where is the first part of the duodenum located?
Just to the right of L1
Transpyloric plane level of 1st part of the duodenum
L1
How long is the first part of the duodenum
2 inches (5cm)
Location of the second part of the duodenum
From the gall bladder to the lower border of L3
How long is the 2nd part of the duodenum
3 inches long
Vertebral level of the 2nd part of the duodenum
L2 and L3
Openings in the 2nd part of the duodenum
Major and minor duodenal papilla
Longest part of the duodenum
Third part (horizontal/inferior part)
How long is the 3rd part of the duodenum
3 inches (8 cm)
Location of 3rd level of duodenum
Level of L3
Length of 4th part of the duodenum
2 in (5cm)
Where does the 4th part of the duodenum end
Duodenojejunal flexure (junction)
Fibers holding the duodenojejunal flexure to the diaphragm- keeps small intestine from getting twisted up
Ligament of Treitz
Is duodenal bulb smooth or tuberculated?
Smooth
Major duodenal papilla
Opening to the hepatopancreatic ampula
Minor duodenal papilla (DOES/DOES NOT) have a sphincter
Does not
Plicae circularis
Circular folds in the duodenum?????? Double check on this
Capillary beds in the duodenum are called the
Intestinal villi
Duct that collects lipids in the duodenum
Lacteal duct
Arterial supply to the duodenum
Upper half: Celiac trunk- supraduodenal artery and superior pancreaticoduodenal arter (anterior and posterior)
Lower half: Superior mesenteric artery: Inferior pancreaticoduodenal artery (ant and post)
First jejunal branch
Length of jejunum and ileum
18-20 feet
Location and length of jejunum
Proximal 8 feet
Lies in the left upper quadrant
Location and length of ileum
Distal 12 feet
Lies in the right lower quadrant
Properties of internal jejunum
Deeper red
Larger lumen
Thicker wall
Prominent plicae circulares
External properties of jejunum
Less prominent arterial arcades
Longer vasa recta
Less mesenteric fat
Atrial arcades
Arterial web-like network coming off of the artery towards the small intestine
Vasa recta
Long finger-like arterials branching off of the arterial arcades, connecting to the small intestin
Internal properties of the ileum
Pale pink
Smaller lumen
Thinner wall
Fewer plicae circulares
Peyer’s patches
External ileum properties
More arterial arcades (more complex)
Shorter vasa recta
More mesenteric fat
Peyer’s patches
Lymphoid tissue that fights large amounts of bacteria in undigested food, keeping it from entering the large intestine
Arterial supply to the jejunoileum
Superior mesenteric arter
Branches of the superior mesenteric artery that supply the small intestine (6)
Inferior pancreaticoduodenal artery
Jejunal arteries
Ileal arteries
Ileocolic arter
Right colic artery
Middle Colic artery
Branches of the ileocolic artery
Ileal branches
Colic branches
Anterior Cecal branch
Posterior cecal branch
Appendicular branch
A 2-layered fold of peritoneum that attaches part of the intestine to the posterior abdominal wall and allows blood vessels, nerves, and lymphatics to pass between these folds to the intestine
Mesentery
Mesenteries (3)
Dorsal mesentary
Transverse mesocolon
Sigmoid mesecolon
Mesentery that suspends the jejunoileum
Makes the greater omentum
Dorsal mesentary
Connects the transverse colon to the posterior abdominal wall
Transverse mesocolon
Attaches the sigmoid colon to the False pelvic cavity
Sigmoid mesocolon
