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An external hemorrhoid. In about 40% of people with pathological hemorrhoids, there are no significant symptoms. [4] Internal and external hemorrhoids may present differently; however, many people may have a combination of the two. [8] Bleeding enough to cause anemia is rare, [5] and life-threatening bleeding is even more uncommon. [15]
Colorectal surgeons instead define the anal canal as the zone from the anal verge to the anorectal ring (palpable structure formed by the external anal sphincter and the puborectalis muscle). [1] Several distinctions can be made based upon the location of a structure relative to the pectinate line:
Anatomy figure: 39:02-06 at Human Anatomy Online, SUNY Downstate Medical Center - "Branches of the inferior mesenteric artery." Anatomy photo:39:05-0112 at the SUNY Downstate Medical Center - "Intestines and Pancreas: Branches of the Inferior Mesenteric Artery" sup&infmesentericart at The Anatomy Lesson by Wesley Norman (Georgetown University)
The rectal venous plexus consists of an external rectal plexus [4]: 598 [5]: 294 that is situated outside to the muscular wall, [3] [4]: 598 [5]: 294 and an internal rectal plexus [4]: 598 [5]: 294 that is situated in the submucosa [5]: 294 /deep to the mucosa [3] [4]: 598 of the rectum and proximal anal canal [3] at the anorectal junction.
The inferior rectal artery arises from the internal pudendal artery as it passes above the ischial tuberosity.. Piercing the wall of the pudendal canal, it divides into two or three branches which cross the ischioanal fossa, and are distributed to the muscles and integument of the anal region, and send offshoots around the lower edge of the gluteus maximus to the skin of the buttock.
External hemorrhoids occur when hemorrhoids are pushed just outside of the anal opening. When this happens, they can swell up, bleed, and feel seriously painful, irritated, and itchy, notes Dr ...
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related to: clinical photos of hemorrhoids pictures and information external anatomy