What is colonic type mucosa?
What is colonic mucosa? Colonic mucosa is a term used to describe the specialized tissue that covers the inside of the colon. The colon is a long, hollow organ and part of the digestive tract. It starts at the end of the small bowel (the ileum) and ends at the anal canal.
What is the histology of the colon?
The colon has the typical histological structure as the digestive tube: mucosa, submucosa, muscularis and serosa/adventitia. The mucosa is lined by simple columnar epithelium (lamina epithelialis) with long microvilli. It is covered by a layer of mucus which aids the transport of the feces.
What is normal colonic mucosa?
Normal colonic mucosa is pale pink, smooth, and glistening, and submucosal blood vessels are commonly seen throughout the colon (see Figures 6-6, A; 6-11; 6-12; and 6-13, A-B). Scattered lymphoid follicles, 2 to 3 mm in diameter, often with umbilicated centers, occur in the rectum and cecum (Figure 6-26, A-C).
What are the major histological features of the large intestine?
The thick mucosa has deep crypts, but there are no villi. The epithelium is formed of columnar absorptive cells with a striated border, many goblet cells, endocrine cells and basal stem cells, but no Paneth cells. The surface epithelial cells are sloughed into the lumen, and have to be replaced around every 6 days.
What is congested mucosa?
This should be distinguished from a congested mucosa, defined as a swelling of the mucosa due to an increase in the thickness of the mucosa, occurring most often in association with an inflammatory process where permeability of cell membranes is altered and the extracellular osmolarity is modified (b).
What is hyperplastic colonic mucosa?
What is a hyperplastic polyp? A hyperplastic polyp is a growth of extra cells that projects out from tissues inside your body. They occur in areas where your body has repaired damaged tissue, especially along your digestive tract. Hyperplastic colorectal polyps happen in your colon, the lining of your large intestine.
What are the characteristic features of the colon?
The colon has some specific characteristics:
- taeniae.
- haustra.
- omental appendices.
- semilunar folds.
What is the function of the mucosa?
The mucosa is the innermost layer, and functions in absorption and secretion. It is composed of epithelium cells and a thin connective tissue. The mucosa contains specialized goblet cells that secrete sticky mucus throughout the GI tract.
What are the histological difference between the small and large intestine?
Histologically, the large intestines can be distinguished from the small intestines by the absence of villi, plicae circularis, and Paneth cells (in adults). Simple columnar epithelium lines its mucosa. The crypts of Lieberkühn are deeper in the colon and goblet cells become more abundant.
What is congested and erythematous mucosa?
So, having erythematous mucosa means the inner lining of your digestive tract is red. Erythematous mucosa isn’t a disease. It’s a sign that an underlying condition or irritation has caused inflammation, which has increased blood flow to the mucosa and made it red.
What causes congested mucosa?
The causes may include: infections, with bacteria, viruses, or parasites. the use of anti-inflammatory drugs, such as ibuprofen, aspirin, beta-blockers, statins, and immunosuppressive drugs. the inflammatory bowel diseases (IBDs) Crohn’s disease and ulcerative colitis.
What is the histological structure of the colon?
Histology. The colon has the typical histological structure as the digestive tube: mucosa, submucosa, muscularis and serosa/adventitia. The mucosa is lined by simple columnar epithelium (lamina epithelialis) with long microvilli. It is covered by a layer of mucus which aids the transport of the feces.
What is the mucosa of the colon composed of?
Macroscopically the mucosal surface of the colon is mostly smooth except for folds called the plicae circulares which are formed by the pleating effect of the taenia coli. The histological section shows three of the four layers of the colon – mucosa on the luminal side, submucosa of loose connective tissue and the muscularis.
What is the structure of the mucosa in histology?
Histology. The mucosa is lined by simple columnar epithelium (lamina epithelialis) with long microvilli. It is covered by a layer of mucus which aids the transport of the feces. The mucosa does not contain villi but many crypts of Lieberkuhn in which numerous goblet cells and enteroendocrine cells are found.
What are the morphological features of the colon?
Morphological Features. Macroscopically the colon has some distinct morphological features compared to the small intestine. Semilunar folds arise in the inner surface through muscle contractions. These are merely caused functionally and therefore movable. These folds form pouches on the external surface ( haustra ).