CELLS ORGANIZE INTO TISSUES THAT BECOME ARRANGED IN ORGANS
The nervous system is composed almost exclusively of nervous tissue. It is nourished by the vascular system, that is formed by epithelial, connective and muscle tissue. However, with the exception of the nervous system, most organs and body structures are formed by a combination of several tissues. The organized combination of their tissues provides each organ with structural and functional properties that will allow them to adequately perform their activities.
The image shows a traansversal section of the tongue surface. It is a good example of how several tissues (and others, that are not present in this small sample of the tongue) combine to form an organ.
Each tissue performs its functions so that the organ as a whole will function properly: the covering epithelium protects the organ and has papillae that facilitate the mixing of food during chewing and contains taste buds that hava a sensorial function. The connective tissue provides physical support to the epithelium, brings blood vessels to its cells and attaches the epithelium to the tongue muscles.
The muscles are responsible for the movement of the tongue. It is the predominant component of the tongue although only a very small part of it appears in this figure).
The glandular epithelium of the glands secretes saliva into the oral cavity.
The nervous tissue (not present in the figure) receives impulses from the tongue’ touch and pressure sensors as well as from the taste buds. Controls the secretion of the glands and the muscular activity of the tongue.
Every structure and organ of the body is built by a combination of tissues, arranged in a characteristic way.
The image shows a traansversal section of the tongue surface. It is a good example of how several tissues (and others, that are not present in this small sample of the tongue) combine to form an organ.
Each tissue performs its functions so that the organ as a whole will function properly: the covering epithelium protects the organ and has papillae that facilitate the mixing of food during chewing and contains taste buds that hava a sensorial function. The connective tissue provides physical support to the epithelium, brings blood vessels to its cells and attaches the epithelium to the tongue muscles.
The muscles are responsible for the movement of the tongue. It is the predominant component of the tongue although only a very small part of it appears in this figure).
The glandular epithelium of the glands secretes saliva into the oral cavity.
The nervous tissue (not present in the figure) receives impulses from the tongue’ touch and pressure sensors as well as from the taste buds. Controls the secretion of the glands and the muscular activity of the tongue.
Every structure and organ of the body is built by a combination of tissues, arranged in a characteristic way.
Tongue. Staining: HE. Small magnification
END OF CHAPTER 1