What are the main components of connective tissues?

The main components of connective tissue include extracellular fibers, stationary and migratory cells, and ground substance (amorphous matrix).  

• There are 3 types of extracellular fibers: collagenous, reticular, and elastic. 
• The most predominant are the fibers which make up collagen (collagenous fibers). They are colorless strands with different diameters, and can function in any direction. 
• Elastic fibers are composed of elastin and have different attributes than collagenous fibers. They do not possess the uniform subunits like collagenous fibers do. 
• Reticular fibers are identified by their ability to create intricate networks surrounding cells and clusters of cells. They stand out due to their characteristic of appearing black when stained. 
• The ground substance is a clear substance which behaves like a thick liquid or very hydrated gel. It mainly comprises large molecules called glycosaminoglycans, which are a combination of proteins and carbohydrates. 
• Stationary cells such as fibroblasts are the primary working cells found throughout connective tissue. They appear as elongated, spindle-shaped cells positioned along bundles of collagen fibers. Their main roles involve forming tropocollagen and other components of the tissues ECM. 
• Mast cells are examples of migratory cells and are found in loose connective tissue. These cells contain large granules filled with histamine and heparin.