2. Mature connective tissue
Mature connective tissue develops from mesenchyme and is present in the newborn. There are 5 main categories of mature connect ive t issue:
A. Loose CT : composed of many cells with loosely intertwined fibres
i. Areolar CT
One of the most widely distributed CTs containing several types of cells and all three types of fibres. They are arranged throughout this tissue. Combined with adipose tissue, areolar CT forms the subcutaneous layer (the layer attaches the skin to the underlying tissues and organs)
ii. Adipose CT
Contain cells called adipocytes derived from fibroblasts and that are specialized for storage of triglycerides (fats). Since Adipose tissue is a good insulator it can reduce heat los s through the skin. It is also a major energy reserve and generally supports and protects various organs.
i ii. Reticular CT
Contains fine interlacing reticular fibres and reticular cells. This CT forms the supporting framework (stroma) of the liver, spleen, and lymph nodes and helps bind together smooth muscle cells. In addition, in the spleen reticular fibres remove worn-out blood cells and in the lymph nodes they filter lymph and remove bacteria.
B. Dense CT:
Fewer cells with more fibres that are thicker and densely packed
i. Dense Regular CT
Bundles of collagen are regularly arranged in parallel patterns that provide the tissue with great strength. Fibroblasts appear in the rows between the fibres.
Examples include:
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