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Dense connective tissue also known as fibrous tissue [8] is subdivided into dense regular and dense irregular connective tissue. [9] Dense regular connective tissue, found in structures such as tendons and ligaments , is characterized by collagen fibers arranged in an orderly parallel fashion, giving it tensile strength in one direction.
In biology, the extracellular matrix (ECM), [1] [2] also called intercellular matrix (ICM), is a network consisting of extracellular macromolecules and minerals, such as collagen, enzymes, glycoproteins and hydroxyapatite that provide structural and biochemical support to surrounding cells.
This type of connective tissue is found mostly in the reticular layer (or deep layer) of the dermis. [3] It is also in the sclera and in the deeper skin layers. Due to high portions of collagenous fibers, dense irregular connective tissue provides strength, making the skin resistant to tearing by stretching forces from different directions.
A mast cell (also known as a mastocyte or a labrocyte [1]) is a resident cell of connective tissue that contains many granules rich in histamine and heparin.Specifically, it is a type of granulocyte derived from the myeloid stem cell that is a part of the immune and neuroimmune systems.
The connective tissue of the lamina propria is loose and rich in cells. The cells of the lamina propria are variable and can include fibroblasts, lymphocytes, plasma cells, macrophages, eosinophilic leukocytes, and mast cells. [2] It provides support and nutrition to the epithelium, as well as the means to bind to the underlying tissue.
It consists mainly of loose areolar and fatty adipose connective tissue and is the layer that primarily determines the shape of a body. [ medical citation needed ] In addition to its subcutaneous presence, superficial fascia surrounds organs , glands and neurovascular bundles , and fills otherwise empty space at many other locations.
Credit - Photo-Illustration by TIME; (Source Images: Katsumi Tanaka—Getty Images; Alain Jocard—AFP/Getty Images; Joel Saget—AFP/Getty Images; Niharika Kulkarni—NurPhoto/Getty Images)
Elastosis is the buildup of elastic fibers in tissues, and is a form of degenerative disease. [17] There are a multitude of causes, but the most commons cause is actinic elastosis of the skin, also known as solar elastosis , which is caused by prolonged and excessive sun exposure, a process known as photoaging .