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Anal canal
Anatomy of the anus and rectum
Coronal section through the anal canal. B. Cavity of urinary bladder V.D. Ductus deferens. S.V. Seminal vesicle. R. Second part of rectum. A.C. Anal canal. L.A. Levator ani. I.S. Sphincter ani internus. E.S. Sphincter ani externus.
Details
Precursor
Hindgut, proctodeum
Artery
Superior rectal artery (above pectinate line) and inferior rectal artery (below line)
Vein
Superior rectal vein (above pectinate line) and Inferior rectal vein (below line)
The anal canal is the part that connects the rectum to the anus, located below the level of the pelvic diaphragm.[1] It is located within the anal triangle of the perineum, between the right and left ischioanal fossa. As the final functional segment of the bowel, it functions to regulate release of excrement by two muscular sphincter complexes. The anus is the aperture at the terminal portion of the anal canal.
^Madoff, Robert D.; Melton-Meax, Genevieve B. (2020). "136. Diseases of the rectum and anus". In Goldman, Lee; Schafer, Andrew I. (eds.). Goldman-Cecil Medicine. Vol. 1 (26th ed.). Philadelphia: Elsevier. p. 933. ISBN 978-0-323-55087-1.
The analcanal is the part that connects the rectum to the anus, located below the level of the pelvic diaphragm. It is located within the anal triangle...
Anal fistula is a chronic abnormal communication between the analcanal and the perianal skin. An anal fistula can be described as a narrow tunnel with...
An anal fissure is a break or tear in the skin of the analcanal. Anal fissures may be noticed by bright red anal bleeding on toilet paper and undergarments...
of the analcanal can cause a liquid stool or mucous rectal discharge. Such lesions include piles (inflamed hemorrhoids), anal fissures, anal cancer,...
are pushed into the analcanal and peristaltic waves push the feces out of the rectum. Relaxation of the internal and external anal sphincters allows the...
kinkajous. The anal glands are situated within the wall of the analcanal and communicate with the lumen of the canal via ducts that open at the anal valves,...
Recto-anal (low) intussusception (intra-anal intussusception) is where the intussusception starts in the rectum and protrudes into the analcanal (i.e...
The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the analcanal. It is about...
is followed by the analcanal, which is about 4 centimetres (1.6 in) long, before the gastrointestinal tract terminates at the anal verge. The word rectum...
line) is a line which divides the upper two-thirds and lower third of the analcanal. Developmentally, this line represents the hindgut-proctodeum junction...
cecum, ascending, transverse, descending, and sigmoid colon, rectum, and analcanal. The small intestine begins at the duodenum and is a tubular structure...
ischiorectal fossa) is the fat-filled wedge-shaped space located lateral to the analcanal and inferior to the pelvic diaphragm. It is somewhat prismatic in shape...
and the end of the internal anal sphincter. The internal anal sphincter forms the walls of the analcanal. The internal anal sphincter is not under voluntary...
mechanically interfering with, or preventing the complete closure of, the analcanal. This type of lesion may not cause discharge intrinsically, but instead...
the combination of the cecum, colon, rectum, and analcanal. Some other sources exclude the analcanal. In humans, the large intestine begins in the right...
anal sphincter is far more substantial than the internal anal sphincter. The proximal portion of external anal sphincter overlaps the internal anal sphincter...
mucosa Penile mucosa Respiratory mucosa Vaginal mucosa Frenulum of tongue Analcanal Conjunctiva Developmentally, the majority of mucous membranes are of endodermal...
Anal cancer is a cancer which arises from the anus, the distal opening of the gastrointestinal tract. Symptoms may include bleeding from the anus or a...
analcanal, bounded laterally by the obturator internus muscle, and medially by the pelvic diaphragm and analcanal; its base is the skin analcanal pudendal...
anal sinus (rectal sinus) is a furrow formed between any two adjacent anal columns of the analcanal. An anal sinus is limited inferiorly by an anal valve...
Anal sphincterotomy is a surgical procedure that involves treating mucosal fissures from the analcanal/sphincter. The word is formed from sphincter +...
An anal plug (anal tampon or anal insert) is a medical device that is often used to treat fecal incontinence, the accidental passing of bowel moments,...
relaxation of the internal anal sphincter in response to distention of the rectum. The RAIR provides the upper analcanal with the ability to discriminate...
chronic, or acute), penetrative anal intercourse, trauma (such as tears or fissures of the rectal sphincter or analcanal), side-effects of some medications...
Evolutionary biology portal The dictionary definition of anus at Wiktionary Analcanal – Functional segment of the large intestine Anorectal manometry – Medical...
the walls of the analcanal, allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the analcanal and peristaltic...
and veins, toward the analcanal and the lower end of the rectum, and is distributed to the sphincter ani externus (external anal sphincter, EAS) and to...
An anal valve is a small horizontal fold uniting the inferior ends of any two adjacent anal columns of the analcanal. An anal valve forms the inferior...
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