They are called Connective Tissues.

Connective tissues support and link various tissues and organs in the body. They are found in all parts of the body. They come from the embryo’s mesoderm (middle germinal layer).

Connective tissue is made up of a few cells in an intercellular framework of collagen or elastin protein fibres released by the cells. The cells also release a thin polysaccharide gel that forms a matrix containing fibres.

Fibres provide connective tissues elasticity, suppleness, and strength. The intercellular material determines the function and kind of connective tissue.

There are different kinds of connective tissues, two of them are loose and dense connective tissues.

Loose connective tissues are found wherever the body needs support and suppleness. Loose connective tissue surrounds blood vessels, nerves, and muscles. This layer, together with adipose tissues, attaches muscles and other structures to the skin.

The semi-fluid matrix holds the fibres and cells loosely. They are situated between several organs and function as shock absorbers and salt and fluid reservoirs.

Areolar Tissue: It maintains epithelium beneath the skin. It has fibroblasts, mast cells, and macrophages. It supports abdominal organs, fills in between muscle fibers, and wraps around blood and lymph arteries.

Adipose Tissue: Stores fat beneath the skin. It absorbs shocks and keeps the body warm in cooler climates.

Dense connective tissue contains fibroblast cells and fibres. They sustain and transfer mechanical forces. More rigid than loose connective tissue. The arrangement of collagen fibres divides them into two types:

Dense Regular Tissue: It has regular fibre orientation. The collagen fibres are found between the parallel running bundles. The uniform arrangement increases tensile strength and resists stretching in the fiber direction. Tendons and ligaments are thick regular tissue.