Loose connective tissue, also called areolar connective tissue. It is the "packing material" of the body that anchors blood vessels, nerves and body organs. It contains fibroblasts that synthesise the fibres and ground substance of connective tissue and wandering macrophages that phagocytise pathogens or damaged cells. The different fibre types include strong collagen fibres and thin elastic fibres formed of the protein elasrin. Adipose (fat) tissue is considered a type of loose connective tissue.