![]() The connective tissue of the gallbladder is covered by adventitia where the gallbladder bounds the liver, but by serosa for the rest of its surface. Generally, if it is a part of the digestive tract that is free to move, it is covered by serosa, and if it is relatively rigidly fixed, it is covered by adventitia. The muscular layer of the duodenum is bounded by both tissue types. Lumen - open space in a vein, artery, or capillary 3 main types - Arteries - Away from heart Most carry Oxygenated blood Veins - Toward. However, at the oral cavity, thoracic esophagus, ascending colon, descending colon and the rectum, the muscular layer is instead bounded by adventitia. In the gastrointestinal tract, the muscular layer is bounded in most cases by serosa. The function of the duodenum is to mix food with enzymes and bile to digest it. The duodenum is connected to the stomach, allowing food particles to leave the stomach to course through the intestines. A lumen (plural: lumina) is a term that describes the cavity within the tubular structure. retroperitoneal organs are covered in adventitia ( loose connective tissue) At 8 to 10 inches long, the duodenum is the first and shortest section of the small intestine.intraperitoneal organs are covered in serosa (a layer of mesothelium, the visceral peritoneum).They correspond to elastic ligaments attached anteriorly in the angle of the thyroid shield and posteriorly to a pair of small pyramidal pieces of cartilage, the arytenoid cartilages. In the abdomen, whether an organ is covered in adventitia or serosa depends upon whether it is peritoneal or retroperitoneal: lumen anatomy Learn about this topic in these articles: respiratory system In human respiratory system: The larynx vocal cords span the laryngeal lumen. The head of the pancreas lies in the C loop. To some degree, its role is complementary to that of the serosa, which also provides a layer of tissue surrounding an organ. The exocrine cells themselves are packed with membrane-bound secretory granules which contain digestive enzymes that are exocytosed into the lumen of the acinus. The duodenum is about 25 to 30 cm long (twelve fingers length), C-shaped and is located in the upper abdomen at the level of L1-元. Gross anatomy Blind-ending sac of bowel that lies below the ileocecal valve, above which the large intestine continues as the ascending colon. ![]() The outer layer of connective tissue that surrounds an artery, or vein – the tunica externa, is also called the tunica adventitia. The cecum (plural: ceca or cecums) is the first part of the large bowel and lies in the right lower quadrant of the abdomen. The urinary bladder is made of several distinct tissue layers: The innermost layer of the bladder is the mucosa layer that lines the hollow lumen. The adventitia ( advɛnˈtɪʃə) is the outer layer of fibrous connective tissue surrounding an organ.
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