In summary, areolar tissue is tough, yet flexible, and comprises membranes. The tissue is also found around and between most body organs. Loose connective tissue is found around every blood vessel and helps to keep the vessel in place. The material in the connective tissue gives it a loose consistency similar to a cotton ball that has been pulled apart. The space between the formed elements of the tissue is filled with the matrix. Collagen fibers are relatively wide and stain a light pink, while elastic fibers are thin and stain dark blue to black. As illustrated in Figure 1, loose connective tissue has some fibroblasts macrophages are present as well. Loose connective tissue, also called areolar connective tissue, has a sampling of all of the components of a connective tissue. The fibers and other components of the connective tissue matrix are secreted by fibroblasts. Shark skeleton, fetal bones, human ears, intervertebral discsįigure 1. Loose connective tissue is composed of loosely woven collagen and elastic fibers. Hyaline: few collagen fibrocartilage: large amount of collagen Irregular: skin regular: tendons, ligaments Connective Tissuesįibroblasts, macrophages, some lymphocytes, some neutrophils The various types of connective tissues, the types of cells and fibers they are made of, and sample locations of the tissues is summarized in Table 1. This fiber consists of thin strands of collagen that form a network of fibers to support the tissue and other organs to which it is connected. Reticular fibers are the third type of protein fiber found in connective tissues. Elastic fibers provide flexibility to the tissues. Elastic fibers are made of the protein elastin this fiber can stretch to one and one half of its length and return to its original size and shape. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues. The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers. When a connective tissue has a high concentration of cells or fibers, it has proportionally a less dense matrix. The matrix in connective tissues gives the tissue its density. Some tissues have specialized cells that are not found in the others. Macrophages, lymphocytes, and, occasionally, leukocytes can be found in some of the tissues. Fibroblasts are motile, able to carry out mitosis, and can synthesize whichever connective tissue is needed. This cell makes the fibers found in nearly all of the connective tissues. The principal cell of connective tissues is the fibroblast. The ground substance is made of an organic substance (usually a protein) and an inorganic substance (usually a mineral or water). Discuss the different types of connective tissues in animalsĬonnective tissues are made up of a matrix consisting of living cells and a non-living substance, called the ground substance.
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