Mucous membrane


























Mucous membrane

Normal gastric mucosa intermed mag.jpg

Histological section taken from the gastric antrum, showing the mucosa of the stomach

Details
Precursor endoderm
Identifiers
Latin tunica mucosa
MeSH D009092
TA A05.4.01.015

Anatomical terms of microanatomy
[edit on Wikidata]
















Layers of the GI Tract english.svg
This article is one of a series on the
Gastrointestinal wall


General structure



  • Epithelium

  • Mucosa

  • Submucosa

  • Circular muscle

  • Longitudinal muscle

  • Serosa

  • Adventitia





  • v

  • t

  • e


A mucous membrane or mucosa is a membrane that lines various cavities in the body and covers the surface of internal organs. It consists of one or more layers of epithelial cells overlying a layer of loose connective tissue. It is mostly of endodermal origin and is continuous with the skin at various body openings such as the eyes, ears, inside the nose, inside the mouth, lip, vagina, the urethral opening and the anus. Some mucous membranes secrete mucus, a thick protective fluid. The function of the membrane is to stop pathogens and dirt from entering the body and to prevent bodily tissues from becoming dehydrated.




Contents






  • 1 Structure


    • 1.1 Development




  • 2 Function


    • 2.1 Nutrition




  • 3 See also


  • 4 References





Structure


The mucosa of organs are composed of one or more layers of epithelial cells that secrete mucus, and an underlying lamina propria of loose connective tissue.[1] The type of cells and type of mucus secreted vary from organ to organ and each can differ along a given tract.[2]


Mucous membranes line the digestive, respiratory, and reproductive tracts and are the primary barrier between the external world and the interior of the body; in an adult human the total surface area of the mucosa is about 400 square meters while the surface area of the skin is about 2 square meters.[3]:1 They are at several places contiguous with skin: at the nostrils, the lips of the mouth, the eyelids, the ears, the genital area, and the anus.[1] Along with providing a physical barrier, they also contain key parts of the immune system and serve as the interface between the body proper and the microbiome.[2]:437


Some examples include:




  • Bronchial mucosa and the lining of vocal folds


  • Endometrium: the mucosa of the uterus

  • Esophageal mucosa

  • Gastric mucosa

  • Intestinal mucosa

  • Nasal mucosa

  • Olfactory mucosa

  • Oral mucosa

  • Penile mucosa

  • Vaginal mucosa

  • Frenulum of tongue

  • Tongue

  • Anal canal

  • Palpebral conjunctiva



Development


Developmentally, the majority of mucous membranes are of endodermal origin.[4] Exceptions include the palate, cheeks, floor of the mouth, gums, lips and the portion of the anal canal below the pectinate line, which are all ectodermal in origin.[5][6]



Function


One of its functions is to keep the tissue moist (for example in the respiratory tract, including the mouth and nose).[2]:480 It also plays a role in absorbing and transforming nutrients.[2]:5,813 Mucous membranes also protect the body from itself; for instance mucosa in the stomach protects it from stomach acid,[2]:384,797 and mucosa lining the bladder protects the underlying tissue from urine.[7] In the uterus, the mucous membrane is called the endometrium, and it swells each month and is then eliminated during menstruation.[2]:1019



Nutrition


Niacin[2]:876 and vitamin A are essential nutrients that help maintain mucous membranes.[8]



See also




  • Mucin

  • Mucociliary clearance

  • Mucocutaneous boundary

  • Mucosal immunology

  • Alkaline mucus

  • Rete pegs




References





  1. ^ ab "Mucous membrane". Encyclopædia Britannica. Retrieved 1 August 2015..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ abcdefg Guyton, Arthur C.; Hall, John E. (2005). Textbook of medical physiology (11th ed.). Philadelphia: W.B. Saunders. ISBN 0-7216-0240-1.


  3. ^ Sompayrac, Lauren (2012). How the Immune System Works (4th ed.). John Wiley & Sons, Ltd. ISBN 9781118290446.


  4. ^ "Chapter 25. Germ Layers and Their Derivatives - Review of Medical Embryology Book - LifeMap Discovery". discovery.lifemapsc.com. Retrieved 2017-02-18.


  5. ^ Squier, Christopher; Brogden, Kim (2010-12-29). "Chapter 7, Development and aging of the oral mucosa". Human Oral Mucosa: Development, Structure and Function. John Wiley & Sons. ISBN 9780470959732.


  6. ^ Schoenwolf, Gary C.; Bleyl, Steven B.; Brauer, Philip R.; Francis-West, Philippa H. (2014-12-01). Larsen's Human Embryology. Elsevier Health Sciences. p. 372. ISBN 9781455727919.


  7. ^ Fry, CH; Vahabi, B (October 2016). "The Role of the Mucosa in Normal and Abnormal Bladder Function". Basic & clinical pharmacology & toxicology. 119 Suppl 3: 57–62. doi:10.1111/bcpt.12626. PMC 5555362. PMID 27228303.


  8. ^ "Vitamin A". MedlinePlus Medical Encyclopedia. February 2, 2015. Retrieved 16 February 2017.











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