Adventitia
Layers of Esophageal Wall: 1. Mucosa 2. The mucous membranes (or mucosae; singular mucosa) are linings of mostly endodermal origin covered in Epithelium, which are involved in Submucosa 3. In the Gastrointestinal tract, the submucosa is the layer of Loose connective tissue that supports the Mucosa, as well as joins the mucosa to the bulk Muscularis 4. Adventitia 5. Striated muscle 6. Striated muscle is a form of fibres that are combined into parallel fibres Striated and smooth 7. Smooth muscle 8. Smooth muscle is a type of non- Striated muscle, found within the Tunica media layer of large and small Arteries and Veins, the bladder Lamina muscularis mucosae 9. The lamina muscularis mucosae (or "muscularis mucosa" is the thin layer of Smooth muscle found in most parts of the Gastrointestinal tract, located Esophageal glands
Dorlands/Elsevier	t_22/12831681

Adventitia is the outermost connective tissue covering of any organ, vessel, or other structure. The esophageal glands are small compound Racemose Exocrine glands of the Mucous type Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group Connective tissue is one of the four types of tissue in traditional classifications (the others being epithelial, Muscle, and Nervous tissue) In Biology, an organ ( Latin: organum, "instrument tool" from Greek όργανον - organon "organ instrument The blood vessels are part of the Circulatory system and function to transport Blood throughout the body

For example, the connective tissue that surrounds an artery is called the tunica adventitia because it is considered extraneous to the artery. Arteries are Blood vessels that carry blood away from the Heart. The tunica externa, also known as the tunica adventitia, is the outermost layer of a Blood vessel, surrounding the Tunica media.

To some degree, its role is complementary to that of the serosa, which also provides a layer of tissue surrounding an organ. In the abdomen, whether an organ is covered in adventitia or serosa depends upon whether it is peritoneal or retroperitoneal:

• peritoneal organs are covered in serosa (a layer of mesothelium, the visceral peritoneum)
• retroperitoneal organs are covered in adventitia (loose connective tissue)

In the gastrointestinal tract, the muscularis externa is bounded in most cases by serosa. In higher Vertebrates the peritoneum is the Serous membrane that forms the lining of the abdominal cavity &mdash it covers most of the intra-abdominal In Anatomy, a serous membrane (or serosa) is a smooth membrane consisting of a thin layer of cells which excrete Serous fluid The mesothelium is a membrane that forms the lining of several body cavities the Pleura (thoracal cavity Peritoneum (abdominal cavity including the mesentery and In higher Vertebrates the peritoneum is the Serous membrane that forms the lining of the abdominal cavity &mdash it covers most of the intra-abdominal The retroperitoneum (adj retroperitoneal) is the anatomical space in the Abdominal cavity behind ( retro) the Peritoneum. Areolar tissue (a type of "loose connective tissue" exhibits loosely organized fibers abundant blood vessels and a lot of seemingly empty space The muscular coat ( muscular layer, muscular fibers, muscularis propria, muscularis externa) is a region of Muscle in many organs However, at the thoracic esophagus, ascending colon, descending colon and the rectum, the muscularis externa is instead bounded by adventitia. The esophagus or oesophagus (see American and British English spelling differences) sometimes known as the gullet, is an organ in (The muscularis externa of the duodenum is bounded by both tissue types. In Anatomy of the Digestive system, the duodenum is a hollow jointed tube about 25-30 cm (10-12 in long connecting the Stomach to the Jejunum )

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. The gallbladder (or cholecyst sometimes gall bladder is a small organ whose function in the body is to store Bile and aid in the digestive process The liver is a vital organ in the human body and is present in Vertebrates and some other animals

See also

• Lumen (anatomy)

External links

• adventitia at eMedicine Dictionary
• Organology at UC Davis Digestive/mammal/system1/system10 - "Mammal, whole system (LM, Low)"
• Histology at OU 55_07 (vermiform appendix)
• Histology at USC rep/c_53 (uterus)
• Histology at USC rep/c_62 (vagina)

A lumen (Lat lūmen, an opening or light (pl lumina is the inside space or lining of a tubular structure such as an artery or intestine eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The University of California Davis, commonly known as UC Davis, or just UCD, is a public coeducational university located in the city of Davis, University of Oklahoma, abbreviated OU, is a Coeducational public Research university located in the U In Human anatomy, the appendix (or vermiform appendix; also cecal (or caecal appendix; also vermix) is a blind ended tube connected to the The University of Southern California (commonly referred to as USC, SC, Southern California, and incorrectly The uterus (from the Latin word for womb) is the major Female reproductive organ of most Mammals including Humans One end the The University of Southern California (commonly referred to as USC, SC, Southern California, and incorrectly The vagina (from Latin, literally " Sheath " or " Scabbard " is a fibromuscular tubular tract leading from the Uterus

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