TISSUES ORGANIZE INTO ORGANS
The nervous system is composed almost exclusively of nervous tissue, which is nourished by the vascular system, formed by epithelial, connective and muscle tissue. However, with the exception of the nervous system, most of the organs and body structures are formed by a combination of several tissues. The organized combination of the various tissues provides each organ with structural characteristics and allows them to properly perform their functions.
The image is of a section of the surface of the tongue. It is a good example of how several tissues (and others, which are not present in this small sample of the tongue) combine to form an organ.
Each of the tissues performs its functions so that the organ as a whole functions 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 nutrition to its cells and attaches the epithelium to the tongue muscles.
The muscle is 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 touch and pressure sensors and from the taste buds and controls the secretion of the glands and the muscular contraction of the tongue.
Every structure and organ of the body is therefore built from a combination of tissues, arranged in a characteristic way.
The image is of a section of the surface of the tongue. It is a good example of how several tissues (and others, which are not present in this small sample of the tongue) combine to form an organ.
Each of the tissues performs its functions so that the organ as a whole functions 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 nutrition to its cells and attaches the epithelium to the tongue muscles.
The muscle is 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 touch and pressure sensors and from the taste buds and controls the secretion of the glands and the muscular contraction of the tongue.
Every structure and organ of the body is therefore built from a combination of tissues, arranged in a characteristic way.
Tongue. Staining: HE. Small magnification
END OF CHAPTER 1