Abdomen 2 Flashcards
superior mesenteric artery (SMA)
supplies the midgut with blood
the midgut includes?
- distal part of the duodenum
- jejunum
- ileum
- cecum
- appendix
- colon up to the splenic flexure (i.e., ascending colon and transverse colon)
where does the SMA arise from?
from the abdominal aorta around the L1 vertebral level and gives off several branches that travel through the mesentery to reach midgut viscera.
intestinal (jejunal and ileal) branches
- arise from the SMA throughout its course and
supply blood to the jejunum and ileum - the intesinal arteries form intesinal arcades
and vasa recta (straight arteries)
arcades
are arching networks formed by several
intesinal branches
vasa recta
project from the arcades to the walls of the small
intesine
where are there less arcades and longer vasa recta?
near the jejunum
where are there more arcades and shorter vasa recta?
ileum
inferior pancreaticoduodenal arteries
arise from the SMA near its origin from the aorta
and supply the pancreas and duodenum with blood
the inferior ____ arteries anastomose with the superior _____ arteries and ultimately form the? thus, there is an anastomosis between?
- inferior pancreaicoduodenal
- superior pancreaicoduodenal
- celiac trunk
- between the SMA and celiac trunk
middle colic artery
arises from the SMA near its origin and courses superiorly toward the transverse colon to supply it with blood
right colic artery
arises from the SMA and courses laterally toward the right to supply the ascending colon with blood
ileocolic artery
is the terminal branch of the SMA and courses inferiorly and to the right to supply the ileocolic junction with blood
appendicular artery
- is a small branch of the ileocolic artery that supplies the appendix
- the appendicular artery is in the mesoappendix
inferior mesenteric artery (IMA) supplies?
the hindgut with blood
hindgut includes?
- colon distal to the splenic lexure (i.e., descending colon and sigmoid colon)
- rectum
the IMA arteries arise from the?
abdominal aorta around the L3 vertebral level and gives of several branches that travel through the mesentery to reach the hindgut
left colic artery
arises from the IMA and courses laterally to the let to supply the descending colon with blood
the sigmoid artery
is often present as multiple branches of the IMA that descend toward the sigmoid colon to supply it with blood.
superior rectal artery
is the terminal branch of the IMA and descends toward the pelvic cavity to supply the superior part of the rectum with blood
marginal artery (of drummond) is formed by?
formed by the anastomosis of the terminal branches of the right colic, middle colic, and ileocolic arteries from the SMA and left colic and sigmoid arteries from the IMA
the continuous arching loop of the marginal artery travels along and supplies blood to where?
- travels along the border of the colon
- ensures constant blood supply to the colon
the marginal artery marks the location of an?
anastomosis between the SMA and IMA
