Fibrous intercellular substances.

Collagenous fibres.Collagenic or collagenous fibres are found in all types of connective tissue and consist of the protein collagen. They are extremely tough.

Collagenous fibres vary from one to twelve micrometers in diameter, although several fibres may be collected together to form a bundle of greater size.

Elastic fibres.Elastic fibres are thin. They run singly (not in bundles). Elastic fibres can be stretched and return to their original length when tension is released.

CLASSIFICATION OF FIBROUS CONNECTIVE TISSUE

The major subdivision in the classification of fibrous connective tissues is determined by the concentration of fibres.

Loose (areolar) connective tissue.Loose (areolar) connective tissue contains many cells and few fibres. It is a loosely arranged, connective tissue. Collagenous fibres are most prominent; elastic fibres, which form a continuous branching network, are relatively inconspicuous. The ground substance is relatively fluid-like and occupies many little areas (areolas) in which no structure ordinarily can be seen.

Dense connective tissue.Dense connective tissue contains few cells and many fibres. It is characterized by the close packing of their fibres. Cells are proportionally fewer than in loose connective tissue, and there is less amorphous ground substance. In areas where tensions are exerted in all directions, fibre bundles are interwoven and without regular orientation and the tissue is termed irregularly arranged. In structures subject to tension in one direction, the fibres have an orderly parallel arrangement and the tissues are designated regularly arranged.

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