The rectum is the final straight portion of the large intestine in humans and some other mammalsand the gut in others. The adult human rectum is about 12 centimetres 4. It terminates at the level of the anorectal ring the level of the puborectalis sling or the dentate lineagain depending upon which definition is used.
The word rectum comes from the Latin rectum intestinummeaning straight intestine. The rectum is a part of the lower gastrointestinal tract.
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The rectum is a continuation of the sigmoid colonand connects to the anus. The rectum follows the shape of the sacrum and ends in an expanded section called the rectal ampullawhere feces are stored before their release via the anal canal. An ampulla is a cavity, or the dilated end of a duct, shaped like a Roman ampulla.
Unlike other portions of the colon, the rectum does not have distinct taeniae coli.
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The rectum connects with the sigmoid colon at the level of S3and connects with the anal canal Average depth of anal penetration it passes through the pelvic floor muscles. Supports of the rectum include: The rectum acts as a temporary storage site for feces. As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate.
If the urge is not acted upon, the material in the rectum is often returned to the colon where more water is absorbed from the feces. If defecation is delayed for a prolonged period, constipation and hardened feces results.
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When the rectum becomes full if the internal and external sphincters are relaxed the increase in intrarectal pressure forces the walls of the anal canal apart, allowing the fecal matter to enter the canal.
The rectum shortens as material is forced into the anal canal. Although peristalsis in the colon delivers material to the rectum, laxatives such as bisacodyl or senna that induce peristalsis in the large bowel do not appear to initiate peristalsis in the rectum.
They induce a sensation of rectal fullness and contraction that frequently leads to defecation, but without the distinct waves of activity characteristic of peristalsis. For the diagnosis of certain ailments, a rectal exam may be done. These include faecal impactionprostatic cancer and benign prostatic hypertrophy in men, faecal incontinenceand internal haemorrhoids.
A colonoscopy or sigmoidoscopy are forms of endoscopy that use a guided camera to view the rectum. These may have the Average depth of anal penetration to take biopsies if needed, and may be used to diagnose diseases such as cancer. Body temperature can also be taken in the rectum. A mercury thermometer should be inserted for 3 to 5 minutes; a digital thermometer should remain inserted until it beeps.
By their definitions, suppositories are inserted, and enemas are injected, via the rectum. Both Average depth of anal penetration these may be used for the delivery of drugs or to relieve constipation; enemas are also used for a variety of other purposes, medical and otherwise. One cause of constipation is faecal impaction in the rectum, in which a dry, hard stool forms.
Manual evacuation is the use of a gloved finger to evacuate faeces from the rectum, and, after the application of stool softenersis utilised in acute constipation.
Digital rectal stimulation, the insertion of one finger into the rectum, may be used to induce peristalsis in patients whose own peristaltic reflex is inadequate to fully empty the rectum. Due to the proximity of the anterior wall of the rectum to the vagina in females or to the prostate in males, and the shared nerves thereof, rectal stimulation or penetration can result in sexual arousal.
English rectum is derived from the full Latin expression intestinum rectum. From Wikipedia, the free encyclopedia. For the route of administration, see Rectal administration. For the conic sections, see Latus rectum and Semi-latus rectum. The human colon seen from front.
The rectum red is near the end of the colon. The rectum lies in front of the sacrum. It lies behind the bladder in males leftand the vagina and uterus in females right. Mitchell; illustrations by Richard; Richardson, Paul Gray's anatomy for students.
J Vis Exp Davidson's principles and practice of medicine. Synonymik der anatomischen Nomenclatur. A Latin dictionary founded on Andrews' edition of Freund's Latin dictionary.
Geschichte und Kritik der anatomischen Sprache der Gegenwart. Ihre Ableitung und Aussprache. Latijnsch-Hollandsch woordenboek over de geneeskunde en natuurkundige wetenschappen.
Anatomy of the gastrointestinal tractexcluding the mouth. Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Piriform sinus. Sphincters upper lower glands. Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands. Ileocecal valve Peyer's patches Microfold cell.
Ascending colon Hepatic flexure Transverse colon Splenic flexure Descending colon Sigmoid colon Continuous taenia coli haustra epiploic appendix.
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Sexuality portal Biology portal. Routes of administrationdosage forms. Mouthwash Toothpaste Ointment Oral spray. Smoking device Dry-powder inhaler DPI.
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Anatomy of the anus and rectum.
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Superior rectal artery first two-thirds of rectummiddle rectal artery last third of rectum. Superior rectal veinsmiddle rectal veins. Inferior anal nervesinferior mesenteric ganglia .
Inferior mesenteric lymph nodespararectal lymph nodesinternal iliac lymph nodesDeep inguinal lymph nodes. Anatomical terminology [ edit on Wikidata ]. Pharynx Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Piriform sinus.
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The rectum is the final straight portion of the large intestine in humans and some other mammals , and the gut in others. The average length of the surgical anal canal was cm (range cm). anal canal in persons below 60 years old versus those above in either sex (P. pararectal lymph nodes, internal iliac lymph nodes, Deep inguinal lymph nodes. Identifiers. Latin, rectum intestinum. MeSH · D · TA · A · FMA · · Anatomical terminology. [edit on Wikidata]. The rectum is the final straight portion of the large intestine in humans and some other In humans, the rectum is followed by the anal canal which is about 4. The human anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum.
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