Where is dense fibrous connective tissue absent?


Question by: Maristella Galli | Last updated: October 26, 2021

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The extracellular matrix is ​​almost absent. It is located around the organs and in the subcutaneous layer, where it acts as a thermoregulator, as a thermal insulator and as an energy reserve.

Where is the dense fibrous tissue found?

The cells are few, there are mostly fibroblasts and rare macrophages, the amorphous substance is scarce. It is found in the dermis, in the fibrous capsule of organs such as spleen, liver, testicle, lymph nodes, forms the sheath of the most important tendons and nerves and the periosteum.

Where is the irregular dense connective tissue found?

This tissue is found in the dermis, in the fibrous capsule that surrounds the organs, in the sheaths of tendons and nerves, in the periosteum.

What functions do connective tissues perform and according to what criteria are they classified?

Connective tissues are classified on the basis of the chemical-physical nature of the intercellular matrix that compose them: … Together with the adipose tissue, it forms the subcutaneous layer. Its functions are to give elasticity and support.

Where is the elastic connective tissue located?

In its microscopic organization, the elastic connective tissue can be organized mainly in parallel fibers (as in the nuchal ligament of ruminants, in the tendons and ligaments of the vertebral column in humans) or in fibers, more or less numerous, scattered among the collagen fibers ( epiglottis, ear …

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What are the characteristics and functions of elastic fibers?

As the name suggests, the main feature of these fibers is their high elasticity, in fact they are able to withstand even considerable torsions and tensions, deforming themselves and then returning to their original state of relaxation (increasing their length up to 50%), however they are not very resistant to traction, …

How to distinguish the connective tissues?

Loose connective tissue is characterized by the presence of numerous cells with variable typology and by an amorphous substance poor in fibers and not particularly dense, therefore not very dyeable with normal histological stains.

What are connective tissues?

The connective tissues are made up of cells of various shapes, not in direct contact with each other, but dispersed in an abundant extracellular matrix. The matrix, secreted by the cells themselves, is made up of a network of protein fibers immersed in a fundamental amorphous substance.

What are the connective tissues proper?

The connective tissues proper are tissues whose amorphous component has an amorphous consistency. They derive from the mesenchyme and are further distinguished according to the different proportion of the components. Also important is the mature mucous tissue, present above all in embryos.

What is the connective system?

The term connective tissue defines a type of tissue that provides structural and metabolic support to other tissues, for this reason the term “support tissue” has been proposed. The connective tissue (and therefore all its different types) derives from the mesenchyme.

Where are collagen fibers found?

Collagen is the most abundant protein in our bodies, found in muscles, bones, blood vessels, digestive tract, tendons and of course our skin. In the latter it serves to give it strength, as well as to replace dead cells.

Which connective tissue cell is responsible for the synthesis of the extracellular matrix?

Collagens are mostly synthesized by fibroblasts but epithelial cells are also able to synthesize them. Collagen fibers continuously interact with an enormous quantity of other molecules of the ECM, constituting a biological continuum fundamental for the life of the cell.

Where is hyaline cartilage found?

Hyaline cartilage forms the outline of most bones, lines the joint surfaces, forms the trachea, larynx and bronchi, as well as the cartilage of the nose and ribs.

What type of connective tissue firmly inserts muscles to bones?

The sinews firmly fix each end of a muscle to a bone. You find … more information, ligaments. The elastic fibers allow the ligaments to stretch.

What are the 6 types of connective?

Cells and intercellular matrix characterize various types of connective tissue: connective tissue proper (connective tissue), elastic tissue, reticular tissue, mucous tissue, endothelial tissue, adipose tissue, cartilage tissue, bone tissue, blood and lymph.

Where is the fundamental substance found?

The fundamental substance, also called amorphous substance, is an acellular component of the connective tissue. It consists mainly of proteoglycans, which are associated with long chains of hyaluronic acid by means of special proteins, called link proteins.

What are the supporting connective tissues?

The connective supporting tissues are characterized by having an abundant extracellular matrix with particular hardness and resistance and can be identified in the bone and cartilage tissue.

What is fibrous tissue?

On the other hand, the term “fibrous tissue” and its synonym “connective-fibrous tissue” indicate a tissue with no function, composed of a mass of collagen fibers.

Why is blood part of the connective tissues?

Blood is a connective tissue. It consists of cells and cell fragments suspended in an extracellular matrix with a complex composition. The unusual feature of blood is that the extracellular matrix is ​​a liquid, so blood is a fluid connective tissue.

What are the fabrics?

We begin by defining tissue as “a group of cells that share a similar structure and function”. There are four basic types of tissue in the human body: a covering tissue or epithelium, a supporting tissue or connective tissue, a muscle tissue and a nerve tissue.

What are chondrocytes?

chondrocyte Cell of cartilage tissue. I c. they are found, often in groups, in the lacunae of the cartilage tissue. They synthesize the proteins (eg, chondrin) of the fundamental substance of cartilage.

What are the fibers of the connective tissue?

In the connective tissue there are collagen, reticular and elastic fibers.

What are the proteins present in the dermis?

collagen: it is a fibrous glycoprotein (protein that contains carbohydrates) produced by fibroblasts, the main cells of the dermis. the collagen fibers are organized in bundles arranged together in a dense interweaving, very resistant to traction.

What is the function of collagen fibers?

Collagen gives structure to our body, protecting and supporting the softer tissues and connecting them with the skeleton. But, while collagen has a fundamental function, it is a relatively simple protein. Collagen is composed of three chains, wrapped together in a compact triple helix.

What is the function of collagen?

Used as a remedy in case of severe skin burns and also used in aesthetic medicine as a filler, collagen is a fundamental protein because it provides the structure to our connective tissue: essentially it “supports” it, thus constituting the support of bones, muscles, tendons and ligaments.


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