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Hiscology Of Bladder: Histology Of Gall Transgender

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HISTOLOGY OF BILIARY SYSTEM

Histology of Gall bladder:

Figure (9): Histology of GB 1. Mucous membrane. 2. Mucosal folds. 3. Muscle coat. 4. Serous layer (Krause, 2005).
(GB= Gallbladder)

The wall of the GB consists of mucosa, which is composed of simple columnar epithelium and lamina propria, a layer of smooth muscles, well-developed per-muscular connective tissue layer and serous membrane. The mucosa has abundant folds that are particularly evident in the empty GB. The epithelial cells are rich in mitochondria and have their nuclei in their basal third; all these cells are capable of secreting small amounts of mucous. Microvilli are frequent at the apical surface. Near the CD, the epithelium invaginates into the lamina propria forming tubuloacinar glands with wide lumens. Cells of these glands have characteristics of mucous secreting cells and are responsible for the production of most of the mucous present in the bile (Singh, 2011).
The muscular layer is thin, with most of the smooth muscle cells arranged around the circumference of the GB. A thick connective tissue layer binds the superior surface of the GB to the liver. The opposite surface is covered by a serous layer and the peritoneum (Singh, 2011).

Histology of …show more content…

All of them have a common structure. They have a mucosa surrounded by a wall made up of connective tissue, in which some smooth muscle may be present. The mucosa is lined by a tall columnar epithelium with a striated border. At its lower end the bile duct is joined by the main pancreatic duct, the two usually forming a common hepato-pancreatic duct (or ampulla) that opens into the duodenum at the summit of the major duodenal papilla. The mucosa of the hepato-pancreatic duct is highly folded. These folds are believed to constitute a valvular mechanism that prevents duodenal contents from entering the bile and pancreatic ducts (Krause,

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