140 



THE ESSENTIALS OF HISTOLOGY. 



transversely striated cells, the structure of which has already been 

 studied (Lesson XVIL, p. 81). 



FIG. 163, A. SECTION OF THE EPICAEDIUM OF THE RIGHT AURICLE. 

 c., serous epithelium in section ; 6, connective-tissue layer ; c, elastic network ; d, subserous 

 areolar tissue ; e, fat ; /', section of a blood-vessel ; g, a small ganglion ; h t muscular fibres 

 of the myocardium ; i, intermuscular areolar tissue. 



B. SECTION OF THE ENDOCARDIUM OF THE RIGHT AURICLE. 



c, lining epithelium ; 6, connective-tissue with fine elastic fibres ; c, layer with coarser elastic 

 fibres ; d, sub-endocardial connective tissue continuous with the intermuscular tissue of 

 the myocardium ; h, muscular fibres of the myocardium ; m, plain muscular tissue in the 

 endocardium. 



FIG. 164. FRAGMENT OF THE NETWORK OF PURKINJE FROM THE VENTRICULAR 



ENDOCARDIUM OF THE SHEEP. (Ranvier.) -. 

 c, cell ; n, nuclei ; /, peripheral striated substance. 



Iii the interstices of the muscular tissue there is a little areolar tissue 

 in which run the very numerous blood-capillaries and the lacunar 

 lymphatics. 



