8 THE CELLULAR TISSUE. 



lar tissue, the former giving the general covering to the 

 body, surrounding, separating and connecting its different 

 parts, while the latter enters into and forms an essential 

 part of their structure. 



The relations of the cellular tissue are of two kinds the 

 one with organs, one of whose surfaces is free, as the skin, 

 serous and mucous structures, and the other with organs 

 where the attachment is all around. 



The adhesion of this tissue varies in different parts. Be- 

 neath the hairy scalp, it is with difficulty separated from 

 the aponeurosis and muscles below and along the middle 

 line of the body, as upon the nose, the lips, linea-alba, and 

 spinous processes, it is considered more adherent than at 

 any other points while in the face, trunk and extremities 

 it is quite free and loose. 



The cellular tissue allows, by its properties of elasticity 

 and flexibility, the movements of the several parts to be per- 

 formed readily, the one upon the other which properties 

 themselves are preseryed by the presence of the serum 

 within its substance. 



In addition to its mobility, this tissue has other uses. 

 The mucous membrane, as that of the stomach, intestines 

 and bladder, connects with the muscular fibres that sur- 

 round it and in the serous membranes it permits that 

 expansion and easy motion we observe in many of the 

 viscera. 



The organic element of cellular tissue, is mostly gelatin. 

 Its development, from microscopic observations, commences 

 with the nucleated cell, which becomes transformed and 

 elongated into fibres, and finally into a fasciculus of ex- 

 tremely delicate fibres. 



It is readily regenerated when destroyed. 



