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Connective tissue is one of the four types of tissue in traditional classifications (the others being epithelial, muscle, and nervous tissue.) It is largely a category of exclusion rather than one with a precise definition, but all or most tissues in this category are similarly:

  • Involved in structure and support.
  • Derived from mesoderm, usually.
  • Characterized largely by the traits of non-living tissue.


Blood, cartilage, and bone are usually considered connective tissue, but because they differ so substantially from the other tissues in this class, the phrase "connective tissue proper" is commonly used to exclude those three. There is also variation in the classification of embryonic connective tissues; on this page they will be treated as a third and separate category.

Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals, making up about 25% of the total protein content.[1]

ClassificationEdit

Connective tissue properEdit

Illu connective tissues 1

Connective tissue proper

Specialized connective tissuesEdit

File:Illu connective tissues 2.jpg

Embryonic connective tissuesEdit

Fiber typesEdit

Main article: Connective tissue cells

Fiber types as follows:

Disorders of connective tissue Edit

Various connective tissue conditions have been identified; these can be both inherited and environmental.

  • Marfan syndrome - a genetic disease causing abnormal fibrillin.
  • Scurvy - caused by a dietary deficiency in vitamin C, leading to abnormal collagen.
  • Ehlers-Danlos syndrome - deficient type III collagen- a genetic disease causing progressive deterioration of collagens, with different EDS types affecting different sites in the body, such as joints, heart valves, organ walls, arterial walls, etc.
  • Loeys-Dietz syndrome - a genetic disease related to Marfan syndrome, with an emphasis on vascular deterioration.
  • Pseudoxanthoma elasticum - an autosomal recessive hereditary disease, caused by calcification and fragmentation of elastic fibres, affecting the skin, the eyes and the cardiovascular system.
  • Systemic lupus erythematosus - a chronic, multisystem, inflammatory disorder of probable autoimmune etiology, occurring predominantly in young women.
  • Osteogenesis imperfecta (brittle bone disease) - caused by insufficient production of good quality collagen to produce healthy, strong bones.
  • Fibrodysplasia ossificans progressiva - disease of the connective tissue, caused by a defective gene which turns connective tissue into bone.
  • Spontaneous pneumothorax - collapsed lung, believed to be related to subtle abnormalities in connective tissue.
  • Sarcoma - a neoplastic process originating within connective tissue.

Staining of connective tissueEdit

For microscopic viewing, the majority of the connective tissue staining techniques color tissue fibers in contrasting shades. Collagen may be differentially stained by any of the following techniques:

See alsoEdit


External linksEdit


Biological tissue
Animals : Epithelium - Connective - Muscular - Nervous
Plants : Epidermis - Vascular tissue - Ground tissue


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