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Connective tissue is one of the four primary types of animal tissue, a group of cells that are similar in structure, along with epithelial tissue, muscle tissue, and nervous tissue. [1] It develops mostly from the mesenchyme , derived from the mesoderm , the middle embryonic germ layer . [ 2 ]
This tissue covers all organismal surfaces that come in contact with the external environment such as the skin, the airways, and the digestive tract. It serves functions of protection, secretion, and absorption, and is separated from other tissues below by a basal lamina. The connective tissue and the muscular are derived from the mesoderm.
Loose connective tissue fibroblasts: Corneal fibroblasts (corneal keratocytes) Tendon fibroblasts: Bone marrow reticular tissue fibroblasts: Other nonepithelial fibroblasts: Hepatic stellate cell (Ito cell) liver Pericyte: Nucleus pulposus cell: intervertebral disc: Hyaline cartilage chondrocyte: Fibrocartilage chondrocyte: Elastic cartilage ...
There are four basic types of animal tissues: muscle tissue, nervous tissue, connective tissue, and epithelial tissue. [5] [9] All animal tissues are considered to be subtypes of these four principal tissue types (for example, blood is classified as connective tissue, since the blood cells are suspended in an extracellular matrix, the plasma). [9]
Cartilage is a resilient and smooth type of connective tissue. Semi-transparent and non-porous, it is usually covered by a tough and fibrous membrane called perichondrium . In tetrapods, it covers and protects the ends of long bones at the joints as articular cartilage , [ 1 ] and is a structural component of many body parts including the rib ...
The main types are loose connective tissue, adipose tissue, fibrous connective tissue, cartilage and bone. The extracellular matrix contains proteins, the chief and most abundant of which is collagen. Collagen plays a major part in organizing and maintaining tissues. The matrix can be modified to form a skeleton to support or protect the body.
Type I collagen can be found in a myriad of different places in the body, mainly forming the matrix of connective tissues. It is present in scar tissue as well as tendons , ligaments , the endomysium of myofibrils , the organic part of bone , the dermis , the dentin , and organ capsules.
In biology, matrix (pl.: matrices) is the material (or tissue) in between a eukaryotic organism's cells. The structure of connective tissues is an extracellular matrix. Fingernails and toenails grow from matrices. It is found in various connective tissues. It serves as a jelly-like structure instead of cytoplasm in connective tissue.