Superior rectal artery

superior hemorrhoidal arterysuperior
The superior rectal artery (superior hemorrhoidal artery) is an artery that descends into the pelvis to supply blood to the rectum.wikipedia
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Rectum

rectalrectallyrectal ampulla
The superior rectal artery (superior hemorrhoidal artery) is an artery that descends into the pelvis to supply blood to the rectum. It divides, opposite the third sacral vertebra into two branches, which descend one on either side of the rectum.
The top two thirds is supplied by the superior rectal artery.

Inferior mesenteric artery

inferior mesenteric arteriesinferior mesentericinferior
The superior rectal artery is the continuation of the inferior mesenteric artery.

Middle rectal artery

middlemiddle rectal arteries
These pierce the muscular coat of the bowel and run downward, as straight vessels, placed at regular intervals from each other in the wall of the gut between its muscular and mucous coats, to the level of the internal anal sphincter; here they form a series of loops around the lower end of the rectum, and communicate with the middle rectal artery (from the internal iliac artery) and with the inferior rectal artery (from the internal pudendal artery).
It is distributed to the rectum, anastomosing with the inferior vesical artery, superior rectal artery, and inferior rectal artery.

Inferior rectal artery

inferiorinferior hemorrhoidal arteriesinferior rectal arteries
These pierce the muscular coat of the bowel and run downward, as straight vessels, placed at regular intervals from each other in the wall of the gut between its muscular and mucous coats, to the level of the internal anal sphincter; here they form a series of loops around the lower end of the rectum, and communicate with the middle rectal artery (from the internal iliac artery) and with the inferior rectal artery (from the internal pudendal artery).
They anastomose with the corresponding vessels of the opposite side, with the superior and middle rectal arteries, and with the perineal artery.

Internal iliac artery

internal iliac arterieshypogastric arteryiliac arteries
These pierce the muscular coat of the bowel and run downward, as straight vessels, placed at regular intervals from each other in the wall of the gut between its muscular and mucous coats, to the level of the internal anal sphincter; here they form a series of loops around the lower end of the rectum, and communicate with the middle rectal artery (from the internal iliac artery) and with the inferior rectal artery (from the internal pudendal artery).

Superior rectal vein

Superior rectal veins
The superior rectal vein leaves the lesser pelvis and crosses the left common iliac vessels with the superior rectal artery, and is continued upward as the inferior mesenteric vein.

Pelvis

pelvicpelvic girdlehip
The superior rectal artery (superior hemorrhoidal artery) is an artery that descends into the pelvis to supply blood to the rectum. It descends into the pelvis between the layers of the mesentery of the sigmoid colon, crossing the left common iliac artery and vein.

Mesentery

mesentericmesenteriestransverse mesocolon
It descends into the pelvis between the layers of the mesentery of the sigmoid colon, crossing the left common iliac artery and vein.

Sigmoid colon

sigmoidsigmoid flexurecolon sigmoideum
It descends into the pelvis between the layers of the mesentery of the sigmoid colon, crossing the left common iliac artery and vein.

Common iliac artery

common iliac arteriescommon iliaciliac
It descends into the pelvis between the layers of the mesentery of the sigmoid colon, crossing the left common iliac artery and vein.

Sacrum

sacralsacral vertebraesacral vertebra
It divides, opposite the third sacral vertebra into two branches, which descend one on either side of the rectum.

Anus

analperianalanal opening
About 10 or 12 cm from the anus, these branches break up into several small branches.

Internal anal sphincter

internalSphincter ani internusanal sphincter
These pierce the muscular coat of the bowel and run downward, as straight vessels, placed at regular intervals from each other in the wall of the gut between its muscular and mucous coats, to the level of the internal anal sphincter; here they form a series of loops around the lower end of the rectum, and communicate with the middle rectal artery (from the internal iliac artery) and with the inferior rectal artery (from the internal pudendal artery).

Internal pudendal artery

Dorsal artery of clitorisdeep artery of clitorisinternal pudendal vessels
These pierce the muscular coat of the bowel and run downward, as straight vessels, placed at regular intervals from each other in the wall of the gut between its muscular and mucous coats, to the level of the internal anal sphincter; here they form a series of loops around the lower end of the rectum, and communicate with the middle rectal artery (from the internal iliac artery) and with the inferior rectal artery (from the internal pudendal artery).

Large intestine

coloncolorectallarge bowel
The IMA terminates as the superior rectal artery.

Peritoneum

peritonealintraperitonealparietal peritoneum

Transanal hemorrhoidal dearterialization

Transanal hemorrhoidal dearterialization (THD) uses a specially developed anoscope combined with a Doppler transducer to identify the hemorrhoidal arteries (originating from the superior rectal artery) 2–3 cm above the pectinate line.

Arterial tree

arterial branchesdistal descending aorta