MINUTE AX ATOMY OF THE HEART. 263 



instances. The nerves terminate in a manner essentially simi- 

 lar to those of serous membranes generally, though it is here 

 extremely difficult to arrive at any positive conclusions. 



The plexus of coarser fasciculi lying in the subserous con- 

 nective tissue, and therefore beneath the muscular layer of the 

 endocardium, and which can easily be brought into view, must 

 be distinguished from the fine networks of fibres above described. 

 Isolated fibres are given off from them, which partly end in 

 the muscles and partly enter into the formation of the above- 

 mentioned fine networks. 



