1.Large intestine:
In the large intestine, [2] the digestive transmission of the colon is very slow, taking 30 to 40 hours until it is excreted in the urine. [32] The colon mainly serves as a site for the fermentation of the digestive tract by the flowers of the stomach. The time taken varies greatly between people. The solid core waste is called the stool and is removed by the integrated contractions of the intestinal walls, called peristalsis, which move forward to reach the rectum and exit with defecation from the anus. The wall consists of the outer lining of the longitudinal muscles, the taeniae coli, and the inner layer of the circular muscle. The circular muscles keep the tool moving forward and prevent any flow of waste back. Also helpful in the performance of peristalsis is the basic electrical rhythm that determines the magnitude of the contrast. [35] Taeniae coli can be identified and targeted by bulges (haustra) in the colon. Many parts of the GI tract are covered with serous membranes and have a message. Some parts of the muscle are full of adventitia.
2.Blood supply:
The digestive system is provided by the celiac artery. The celiac artery is the first large branch from the abdominal aorta, and the only major bone that feeds the digestive organs.
There are three main stages - the left abdominal artery, the common hepatic artery, and the splenic artery.
The celiac artery supplies the liver, stomach, spleen and the upper 1/3 of the duodenum (up to Oddi's sphincter) and the pancreas with oxygenated blood. Most of the blood is returned to the liver through the portal venous system for further processing and toxic release before returning to the circulatory system through the hepatic arteries.
The next branch from the abdominal aorta is the superior mesenteric artery, which provides the regions of the midgut-digestive tract, including the distal 2/3 of the duodenum, jejunum, ileum, cecum, appendix, ascending colon, and proximal 2/3 of the changing colon.
The last major component of the digestive system is the lower mesenteric artery, which provides regions with a hindgut digestive tract, which includes the distal 1/3 of the flexible, descending colon, sigmoid colon, rectum, and the upper extremity of the larynx. pectinate.
The blood flow to the digestive tract reaches a maximum length of 20-40 minutes after meals and lasts 1.5-2 hours. [36]
3.Nerve supply
The enteric nervous system contains 100 million neurons [37] embedded in the peritoneum, the lining of the intestinal tract from the throat to the anus. [38] These neurons are grouped into two plexuses - the myenteric plexus (or Auerbach's) lying between the longitudinal and smooth muscle layers, and the submucosal (or Meissner's) plexus lying in the middle of the smooth tissue and mucosa. [39] [40] [41]
Parasympathetic isolation of the ascending colon is provided by the vagus nerve. Sensitivity preservation is provided by splanchnic nerves that join the celiac ganglia. Most of the digestive tract is overlooked by two large celiac ganglia, with the upper part of each group connected by a large splanchnic nerve and the lower parts connected by a small splanchnic nerve. It is from these ganglia that most of the plexus of the abdomen emerges.
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