12 terms

Arterial Supply to Inestines (in depth)

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Superior mesenteric a.
Origin abdominal aorta (L1)

Course: runs in root of mesentery to ileocecal junction

Distribution: part of gastroinestinal tract derived from midgut
Intestinal a. (n= 15-18)
Origin: superior mesenteric a.

Course: passes between two layers of mesentery

Distribution: jejunum and ileum
Middle colic a.
Origin: superior mesenteric a.

Course: ascends retroperitoneally and passes between layers of transverse mesocolon

Distribution: transverse colon
Right colic a.
Origin: superior mesenteric a.

Course: passes retroperitoneally to reach ascending colon

Distribution: ascending colon
Ileocolic a.
Origin: terminal branch of superior mesenteric a.

Course: runs along root of mesentery and divides into ileal and colic branches

Distribution: ileum, cecum, and ascending colon
Appendicular a.
Origin: ileocolic a.

Course: passes between layers of mesoappendix

Distribution: appendix
Inferior mesenteric a.
Origin: abdominal aorta (L3)

Course: descends retroperitoneally to left of abdominal aorta

Distribution: descending colon
Left colic a.
Origin: inferior mesenteric a.

Course: passes retroperitoneally toward left to descending colon

Distribution: descending colon
Sigmoid a. (n= 3-4)
Origin: Inferior mesenteric a.

Course: passes retroperitoneally toward left to sigmoid colon

Distribution: descending and sigmoid colon
Superior rectal a.
Origin: terminal branch of inferior mesenteric a.

Course: descends retroperitoneally to rectum

Distribution: proximal part of rectum
Middle rectal a.
Origin: internal iliac a.

Course: passes retroperitoneally to rectum

Distribution: midpart of rectum
Inferior rectal a.
Origin: internal pudenal a.

Course:crosses ischio-anal possa to reach rectum

Distribution: distal part of rectum and anal canal