118 THE ESSENTIALS OF HISTOLOGY 



ing near the free edge of the valve (c'). At the base of the auriculo- 

 ventricular valves a little of the muscular tissue of the auricle may be 

 found passing a short distance into the valve. 



The nerves of the heart are seen in sections underneath the epi- 

 cardium of both auricles and ventricles ; in the former situation, they 

 are connected at intervals with small ganglia (fig. 141, g). Their 

 branches pass to the muscular substance, but their mode of termina- 

 tion has not been ascertained. 



