.80 



STUDENTS HISTOLOGY 



-cover, and focus with H. Fig. 54 was drawn from such a 

 preparation. 



The sarcolemma is best seen where the contractile substance 

 las been broken. The muscle nuclei are seen at various points 

 beneath the sarcolemma. Portions of a fiber have been split off 

 transversely in places, indicating the disk of Bowman. The 

 fibrillae are indicated where the fiber has been split longitudinally 

 during the teasing. The capillaries are arranged in a direction 

 parallel to the fibers, with frequent transverse connections. 



CARDIAC MUSCULAR FIBER 



It presents the following characteristics: 



1. The fibers are smaller than those of ordinary skeletal muscle. 



2. They are striated both transversely and longitudinally. 



3. They branch, forming frequent inosculations. 



FIG. 55. TEASED CARDIAC MUSCULAR FIBERS. 

 Stained with haematoxylin, X 400 and reduced. 



4. They are divided by distinct transverse lines into short cells. 



5. Their nuclei are situated within the fiber. 



6. They present no distinct sarcolemma. 



Notice the groups of yellowish brown pigment -granules within 

 the muscle-cells close to the nuclei. Fig. 55 has been drawn from 

 fresh cardiac muscle, teased in normal salt solution and tinted 

 with eosin. 



