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Connective tissue has a unique feature where the tissue is primarily made up of the extracellular matrix, rather than densely packed cells. The 4 main groups of connective tissue are connective tissue proper,cartilage, bone and blood. Some specific examples are presented here (Figure 3.4).
Dense regular tissue is a type of connective tissue proper. The extracellular matrix contains collagen fibres secreted by fibroblasts (the main cell type in this tissue). Parallel arrangement of these fibres givesthis tissue great tensile strength, e.g. tendons and ligaments.
Adipose tissue (fat) is also a type of connective tissue proper. It consists of unique cells called adipocytes which are filled with lipid. Adipose tissue is essential in insulation against heat loss and asstorage of fuel for cellular processes.
Osseous tissue (bone) is a hard, calcified matrix made up of calcium salts. The primary cell type is an osteocyte. The primary function of bone is to support and protect body structures.
Figure 3.4 Some examples of different types of connective tissue (Copyright, QUT)
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