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From Karnataka Open Educational Resources
Organisation of cells animal tissues (view source)
Revision as of 01:38, 6 August 2014
, 01:38, 6 August 2014→Notes for teachers
*Fluid Connective tissue<br>
*Fluid Connective tissue<br>
'''Loose Connective tissue'''
'''Loose Connective tissue'''<br>
The tissue in which the fibres in the matrix are loosely arranged is called loose Connective tissue.Areolar tissue,Adipose tissue and reticular tissue are included under this group.<br>
The tissue in which the fibres in the matrix are loosely arranged is called loose Connective tissue.Areolar tissue,Adipose tissue and reticular tissue are included under this group.<br>
'''Areolar tissue'''
'''Areolar tissue'''<br>
Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow. It fills the space inside the organs, supports internal organs and helps in repair of tissues.<br>
Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow. It fills the space inside the organs, supports internal organs and helps in repair of tissues.<br>
http://aandpeasyaspanda.files.wordpress.com/2011/10/areolar1.jpg
The three different fibres of areolar connective tissue are arranged in no particular pattern but run in all directions and form a loose network in the intercellular material.
*Collagen (collagenous) fibres or white fibres are predominant. They usually appear as broad pink bands.
*Collagen (collagenous) fibres or white fibres are predominant. They usually appear as broad pink bands.
*Yellow fibres or elastic fibres, which appear as thin, dark fibres are also present.
*Yellow fibres or elastic fibres, which appear as thin, dark fibres are also present.
*Reticular fibres.<br>
*Reticular fibres.<br>
http://www.kshitij-school.com/Study-Material/Class-11/Biology/Structural-organisation-in-animals/Animal-tissues/4.jpg
The different types of cells embedded within the areolar tissue include:<br>
*'''Fibroblasts''':They are large,flat,highly branched.They secrete and maintain fibres.
*'''Plasma Cells''':They are oval in shape.They produce antibodies.
*'''Adipocytes''':Adipose tissue consists of fibrous connective tissue and fat cells called Adipocytes.
*'''Mast Cells''':They are large cells having spherical nucleus with granular cytoplasm.
*'''Macrophages.''':They are ameoboid in shape and are wandering cells.They defend against micro-organisms and ingest them and hence are called '''phagocytes'''.
'''Adipose tissue'''
'''Adipose tissue'''
Fat-storing adipose tissue is found below the skin and between internal organs. The cells of this tissue are filled with fat globules. The tissue stores fat which are used as and when the body requires.Storage of fat provides insulation against cold and protects the body like a shock absorber.<br>
Fat-storing adipose tissue is found below the skin and between internal organs. The cells of this tissue are filled with fat globules. The tissue stores fat which are used as and when the body requires.Storage of fat provides insulation against cold and protects the body like a shock absorber.<br>
Obesity in animals, including humans, is not dependent on the amount of body weight, but on the amount of body fat - specifically adipose tissue.
In mammals, two types of adipose tissue exist: white adipose tissue (WAT) and brown adipose tissue (BAT).
http://www.vetmed.vt.edu/education/curriculum/vm8054/Labs/Lab5/IMAGES/Brown%20adipose%20Tissue%20photo%20WITH%20LABEL%20copy.jpg
'''Adipose tissue with fat cells'''
http://education-portal.com/cimages/multimages/16/skin_layers_2.jpg
'''Figure showing the location of adipose tissue below epidermis'''
'''Reticular tissue'''
Reticular connective tissue is a type of connective tissue.It has a network of reticular fibers, made of type III collagen.Reticular connective tissue is found around the liver, the kidney, the spleen, and lymph nodes, as well as in bone marrow.Reticular connective tissue resembles areolar connective tissue, but the only fibers in its matrix are reticular fibers, which form a delicate network along which fibroblasts called reticular cells lie scattered. Although reticular fibers are widely distributed in the body, reticular tissue is limited to certain sites. It forms a labyrinth-like stroma or internal framework, that can support many free blood cells (large lymphocytes) in lymph nodes, the spleen, and red bone marrow.It forms the architectural framework of: liver, adipose tissue, bone marrow, spleen and basement membrane, to name a few.
http://legacy.owensboro.kctcs.edu/gcaplan/anat/notes/reticular1.jpg
'''Reticular tissue'''
'''Reticular tissue'''
