What is the histology of the colon?
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 are the layers of the colon?
In most portions of the gastrointestinal tract, the bowel wall is comprised of four layers: the mucosa, submucosa, muscularis propria, and serosa.
What type of epithelium is colon?
6.7. 6 GUT Epithelium. The inner lining of the colon and small intestine is a simple columnar epithelium constantly renewed by the proliferation of stem cells residing within pockets, or crypts, along the intestinal wall.
How many layers does the colon have?
The intestinal wall is made up of multiple layers. The 4 layers of the large intestine from the lumen outward are the mucosa, submucosa, muscular layer, and serosa. The muscular layer is made up of 2 layers of smooth muscle, the inner, circular layer, and the outer, longitudinal layer.
What is the submucosa of the colon?
Beneath the mucosa is the next major layer of the colon, the submucosa. This layer consists mostly of dense irregular connective tissue, but also contains blood vessels, lymphatic vessels, and the submucosal or meissner’s plexus.
Does colon have serosa?
Serosa. The serosa is the outer layer of the colon. It is not found on most of the rectum.
What type of epithelium is in the rectum?
The rectum is characterized by the same columnar epithelium that lines the majority of the gastrointestinal tract’s secretory and absorptive areas. The anus, on the other hand, has a stratified squamous epithelium that provides a greater deal of protection to the underlying tissue.
What type of epithelial tissue is in the large intestine?
simple columnar epithelium
The wall of the large intestine is lined with simple columnar epithelium. Both the small intestine and the large intestine have goblet cells, but they are abundant in the large intestine.
Does colon have microvilli?
10.1. In the large intestine, villi, microvilli, and crypts are not present, and hence it offers much less surface area for the absorption of administered peptides and proteins. The cells are much less dense than those in the small intestine.
Does colon have muscularis mucosa?
It is a fairly thin layer, being only 3 to 10 cells thick, extending into the circular folds (plicae circularis). The colonic muscularis mucosae is thicker, and the thickness increases progressively from the cecum to the anal canal.
Which parts of colon have serosa?
The cecum is completely covered by the serous membrane, except in about 5 per cent. of cases where the upper part of the posterior surface is uncovered. The ascending, descending, and iliac parts of the colon are usually covered only in front and at the sides; a variable amount of the posterior surface is uncovered.