62 



PRACTICAL MICRO-SCOFF. 



3-n intimate network of exceedingly fine elastic fibrillae, and will re- 

 ceive attention later in our work. 



Embryonic Connective Tissue presents a homogeneous, mucoid 

 matrix containing branched cells. It is not found normally in the 

 adult. 



MUSCULAR TISSUE. 



This tissue is found in three varieties: 1. Non-striated or involun- 

 tary; 2. Striated, red, skeletal, or voluntary; 3. Cardiac. 



N02ST- STRIATED MUSCLE. 



The histological element of non-striated muscle is a spindle-shaped 

 cell from one-tenth to one-five hundredth of an inch long. The cell 

 body presents longitudinal striae, and contains an ovoid nucleus. The 

 nucleus contains a reticulum which is probably in connection with the 



FIG. 47. WALL OF THE FROG'S BLADDER, STAINED WITH 



A. A. Bands of involuntary muscular fibre, recognized by the spindle-cell sarcous elements. 



B. A small arteriole, showing the same muscular element. 



C. Scattering muscle cells. 



D. Connective tissue cells. X 400. 



fibrillae, which produce the longitudinal striation of the body. The 

 cells are not unfrequently bifid at one or both extremities. A trans- 

 parent cement substance serves to unite these cells in forming, with 

 connective tissue, broad membranous plates, bundles, plexuses, etc. 



