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Recommended: The digestive system
Rectum
The rectum is continuous with the sigmoid colon proximally at the rectosigmoid junction (S3) and with the anal canal distally1. The rectum has a sacral flexure which follows the curve of the sacrum and the coccyx1. The anorectal flexure is an S-shaped flexure which has a sharp postero-inferior bend antero-inferior to the tip of the coccyx and it penetrates the pelvic diaphragm1. It maintained by the puborectal sling through the puborectalis muscle1. Lastly, the rectum also has lateral flexures due to transverse rectal folds1. There is a superior, intermediate and inferior lateral flexure1.
Relationships of the rectum1:
• Inferior o Pelvic diaphragm (levator ani) o Anococcygeal ligament
• Anterolateral o Peritoneum of superior rectum
• Anterior o Peritoneum of middle rectum o Females
Retrouterine pouch
Vagina o Males
Retrovesicular pouch
Fundus of urinary bladder
Terminal parts of ureters
Vas deferens, seminal glands and prostate
• Lateral o Pararectal fossae
• Posterior o 3 inferior sacral vertebrae o Coccyx o Anococcygeal ligament o Median sacral vessels o Inferior ends of sympathetic trunk and sacral plexus
The arterial supply of the proximal rectum is by the superior rectal artery from the inferior mesenteric artery1. The middle and inferior rectum is supplied by the middle rectal arteries which are branches of the internal iliac arteries1. The anorectal junction and inferior anal canal are supplied by the inferior rectal artery from the internal pudendal artery1. The superior and inferior rectal arteries anastomose. The venous drainage flows via the superior, middle and inferior rectal veins1. The superior and middle rectal vein drains into the portal vein terminally, while the inferior rectal vein drai...
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...uperior ½ of anal canal drains deep into the internal iliac lymph nodes and then into the common iliac nodes to the lumbar lymph nodes1. The inferior ½ drains superficially into superficial inguinal lymph nodes1.
The superior ½ of the anal canal has visceral innervation1. It is involuntary, and it is supplied from the hypogastric plexus with sympathetic, parasympathetic and visceral components which travel to S2-S41. Inferior ½ has voluntary with somatic innervation from the inferior anal (rectal) nerves, which branch from the pudendal nerve1. This part of the canal is sensitive to pain, temperature, and touch1.
Works Cited
1. Moore KL, Dalley AF, Agur AMR. Clinically Orientated Anatomy. 6th ed. Philadelphia: Lippincott Williams & Wilkins; 2010. p.246-253; 411-414.
2. Netter, FH. Atlas of Human Anatomy. 5th ed. Philadelphia: Saunders Elsevier; 2009. Plate 373.
...inePlus Medical Encyclopedia." U.S National Library of Medicine. U.S. National Library of Medicine, n.d. Web. 21 Apr. 2014.
Marieb, E. N., (2006). Essentials of human anatomy and physiology. San Francisco, CA: Benjamin Cummings.
The Structure and Functions of the Arteries Arteries are blood vessels that convey blood from the heart to the tissues of the body. The arteries expand and then constrict with each beat of the heart, a rhythmic movement that may be felt as the pulse. Arteries are usually named from the part of the body that they are found, for example; brachial artery found in the arms, metacarpal artery found in the wrist; or from the organ which they supply as the hepatic artery supplies the liver, pulmonary artery brings deoxygenated blood the lungs. The facial artery is the branch of the external carotid artery that passes up over the lower jaw and supplies the superficial portion of the face; the haemorrhoidal arteries are three vessels that supply the lower end of the rectum; the intercostal arteries are the arteries that supply the space between the ribs; the lingual artery is the branch of the external carotid artery that supplies the tongue. The structure of the artery enables it to perform its function more efficiently.
Stomach, an organ belongs to the digestive system, plays an important role in human body. This J-shaped organ can be full with one liter of food. Stomach is located on left upper part of abdominal cavity, it connects the esophagus (upper) with the small intestine (below). To the left of the stomach, there is a spleen and to the right of it, we’ve got the liver. There are four sections of the stomach: cardia, fundus, body and pyloric. To control the openings into the stomach, the gastroesophageal sphincter relaxes and allowing food leave the stomach is the function of pyloric sphincter. The stomach wall has three layers of muscles that help it contracts in all direction to break food into smaller molecules. Moreover, this organ is lined by mucus coat to neutralize acid
Ulcerative colitis progresses from the rectum and moves proximally. Distal disease refers to inflammation that is limited to the rectum (proctitis) or rectum and sigmoid colon. Here it is referred to as proctosigmioditis. If the disease is more extensive it includes the left side of the colon and can cover the splenic flexure. This occurs in 40% of patients. Extensive colitis occurs up to the hepatic flexure. Pan colitis affects the whole of the colon and this can affect up to 20% of patients. Some patients with pan colitis have involvement of the terminal ileum, this is caused by an incompetent ileocaecal valve.
The digestive system process begins at the mouth and finishes at the anus. This system includes the mouth→ pharynx→ salivary glands→ larynx→ oesophagus→ stomach→ liver→ pancreas→ duodenum→ small intestine→ large intestine→ rectum→ anus.
Mink Intro – External Anatomy Overview. (n.d.). mreroh.com . Retrieved May 27, 2014, from http://www.mreroh.com/student/apdocs/Dissection/Intro%20-%20External%20Anatomy.pdf
Rectum is a chamber that contain around 8 inch of tube, the rectum are connected to the large intestine and anus. Rectum have a function of release the unnecessary product.
... Medicine. 3rd ed. Vol.3. Detroit: Gale, 2006.2139-2141. Gale Virtual Reference Library. Web. 3 Apr. 2014.
JAMA: Journal of the American Medical Association. 14 Nov. 2001: 2322. Academic Search Complete. Web.
Lets begin by discussing the big picture view of the urinary system. It is comprised by the kidneys, ureter, bladder, and the urethra. Referring to the anatomical position the right kidney is lower than the left kidney due to the liver being large. In a transverse cut and view from above one can see that the digestive organs are in a separate cavity from the urinary system. The peritoneal cavity houses the digestive organs and it houses serous membrane which secretes a small amount of fluid in the cavity that lubricates organs so that they experience very little friction as they move about inside of the body. The kidneys are in the retroperitoneal cavity, literally that means behind the peritoneal cavity. Unlike the digestive organs the kidneys are not allowed to move much when the body moves. They are held in place by perirenal fat, this fat firmly holds them in place. If someone gets to abnormally thin the kidneys can slip causing the ureter to get pinched.
Rectus, and External and Internal Obliques flex the spine. Transversus aids in respiration and helps to compress the abdominal cavity to help support the spine in neutral. 4. How does the breath relate to flexion and extension of the spine?
The Alimentary tract to do its function, requires hormonal and nervous control. The gastrointestinal tract has its own nervous system which is called the enteric nervous system. This system consist of myentric plexus which is responsible for the gastrointestinal movement and the submucosal plexus which controls the gastrointestinal secretion and local blood flow. (1)
The excretory system, which includes the rectum and anus helps the digestive system by getting rid of waste and the digestive system helps the excretory system by breaking down food to be eliminated from the body. Wow! The human body wouldn’t be able to work without one or the other. Anyways, I hope you enjoyed reading my journey throughout the human digestive system. I hope to write again from where my next journey from here will begin- perhaps it will be in the ocean or along Sydney Water pipes. Until next
The digestive system is a very important system in the human body. It is a group of organs that work together to turn food into energy and nutrients in the entire body. The food that was chewed in a humans’ mouth now passes through a long tube that is inside of the body that is known as the alimentary canal. The alimentary canal is made of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. Those few things are not the only important accessories of the digestive system there is also the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.