Nail courses – Stromal connective tissue
Stromal connective tissue occurs in the largest amount in organisms containing relatively large intercellular space. Fibers (long protein textures) that are produced by the cells of tissues can be found in its intercellular space ensuring the reception of mechanical strains (pulling, pressing, bending).
The connective tissue fills in the space among organs, joins the body parts, tissues. By forming the inside part of the organisms it provides support for the body. It mainly resists pulling strains, having rich blood and lymphatic system. It is capable of storing water and fat.
The most important types of connective tissues:
- loose connective tissue: in which the fibers of intercellular space form an irregular, loose network, (It can be found everywhere in the organism, having a connective and space filling role and with the help of its rich blood and lymphatic system contributes to the nutrition of organs).
Its intercellular space contains:
– Gelatinous ground substance
– Fibers: inelastic, collagen fibers including elastic fibers and grate-fibers.
- dense connective tissue (tendon tissue) in which collagen fibers are arranged densely and in parallel. They form the tendons of muscles.
- a special kind of connective tissue is the blood: its intercellular space is fluid, its cellular space is made up of red blood cells, white blood cells and blood plaques.
Adipose tissue makes a transition between connective and stromal tissues. Its cells store mainly fats. Its functions are storing energy, it has mechanical protective (cushion) and heat insulator roles.
Stromal tissues have solid intercellular space and are mainly suitable for the reception of pressing and bending strains. Based on their elasticity stromal tissues can be divided into cartilage and bone tissues.
- Cartilage tissue is elastic, resistant and softer than the bone (can be cut with knife). The cartilage tissue does not contain blood vessels and nerves, however, the surface of the cartilage is covered by cartilage membrane (connective tissue membrane) which is rich in nerves and blood vessels. It is mainly found at the ends of bones, and as one grows older it is partially ossified. They are classified into hyaline cartilage (covers the joint surfaces ensuring their easy movements), elastic cartilage (ear, tip of the nose) and fibro-cartilage.
- Bone tissue is less elastic but extremely solid. It is formed by concetric layers of longish, plum stone – shaped cells. The most part of its intercellular space is made up of inorganic, non water- soluble salts (calcium compounds) which make it hard. (Bone tissue also contains connective tissue fibers in small amounts ensuring the little elasticity of bones). It has a considerable network of blood vessels.