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Loose connective tissue

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Title: Loose connective tissue  
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Subject: Integumentary system, Terminologia Histologica, Skin cancer, Drug eruption, Subcutaneous tissue
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Loose connective tissue

Loose connective tissue
Details
Latin textus connectivus laxus
Identifiers
Code TH H2.00.03.1.00002
Anatomical terminology

Loose connective tissue is a category of epithelial tissue to other underlying tissues. It also surrounds the blood vessels and nerves. Cells called fibroblasts are widely dispersed in this tissue; they are irregular branching cells that secrete strong fibrous proteins and proteoglycans as an extracellular matrix. The cells of this type of tissue are generally separated by quite some distance by a gelatinous substance primarily made up of collagenous and elastic fibers.

Loose connective tissue is named based on the weave and type of its constituent fibers. There are three main types of connective tissue fiber:

  • Collagenous fibers: collagenous fibers are made of collagen and consist of bundles of fibrils that are coils of collagen molecules.
  • Elastic fibers: elastic fibers are made of elastin and are "stretchable."
  • Reticular fibers: reticular fibers consist of one or more types of very thin collagen fibers. They join connective tissues to other tissues.

Areolar tissue () is a common type of loose connective tissue (and the most widely distributed type of epithelial tissues (which are avascular) get their nutrients from the interstitial fluid of areolar tissue; the lamina propria is areolar in many body locations. Its fibers run in random directions and are mostly collagenous, but elastic and reticular fibers are also present. Areolar tissue is highly variable in appearance. In many serous membranes, it appears as a loose arrangement of collagenous and elastic fibers, scattered cells of various types; abundant ground substance; numerous blood vessels. In the skin and mucous membranes, it is more compact and sometimes difficult to distinguish from dense irregular connective tissue.

Usually "loose connective tissue" is considered a parent category that includes the mucous connective tissue of the fetus, areolar connective tissue, reticular connective tissue, and adipose tissue.[2]

Contents

  • Location 1
  • Composition 2
  • Function 3
  • Classification 4
  • See also 5
  • References 6

Location

It may be found in tissue sections from almost every part of the body. It surrounds blood vessels and nerves and penetrates with them even into the small spaces of muscles, tendons, and other tissues. It may likewise be present in the mediastinal extremities. Nearly every epithelium rests on a layer of areolar tissue, whose blood vessels provide the epithelium with nutrition, waste removal, and a ready supply of infection-fighting leukocytes in times of need. Because of the abundance of open, fluid-filled space, leukocytes can move about freely in areolar tissue and can easily find and destroy pathogens.

The areolar tissue is found beneath the body systems that have external openings.

It is also a component of the lamina propria of the digestive and respiratory tracts, the mucous membranes of reproductive and urinary systems, the stroma of glands, and the hypodermis of the skin. It is also found in the mesentery which is surrounding the intestine.

Composition

Schematic representation of the composition of loose connective tissue

It is a pliable, mesh-like organs.

Fibroblasts are widely dispersed in this tissue; they are irregular branching cells that secrete strong fibrous proteins and proteoglycans as an extracellular matrix.

The cells of this type of tissue are generally connected by a gelatinous substance known as ground substance primarily made up of collagenous and elastic fibers.

Function

Areolar connective tissues hold epithelial tissue to other underlying tissues. It also serves as a reservoir of water and salts for surrounding tissues. Almost all cells obtain their nutrients from and release their wastes into areolar connective tissue.

Classification

Loose connective tissue is named based on the "weave" and type of its constituent fibers. There are three main types:

  • Collagenous fibers: collagenous fibers are made of collagen and consist of bundles of fibrils that are coils of collagen molecules.
  • Elastic fibers: elastic fibers are made of elastin and are "stretchable."
  • Reticular fibers: reticular fibers consist of one or more types of very thin collagen fibers. They join connective tissues to other tissues.

See also

References

  1. ^ "areolar tissue" at Dorland's Medical Dictionary
  2. ^ "Blue Histology - Connective Tissues". Retrieved 2008-12-05. 
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