146 



DONALD M. MAYNARD 



Fig. 2. Diagram of cardiac ganglion 

 (Paiiulinis). The major branches are 

 severed near the trunk; the minor 

 branches are not shown. All of the 

 nerve cells but only a fraction 

 of the ganglionic axons, dendrites, 

 and processes are indicated. LNS, 

 large neuron soma: two large cells 

 send axons anteriorly, three send 

 axons posteriorly, all have dendritic 

 arborizations, DA, pericellular in- 

 hibitor networks, and collaterals to 

 neuropiles, Np. SNS, small neuron 

 soma: all small cell axons go anteri- 

 orly; pericellular inhibitor networks 

 are absent, but dendritic arboriza- 

 tions and neuropiles are universal. 

 The inhibitor fiber, /, and two ac- 

 celerator fibers, a, enter on each side 

 through the dorsal nerve. The in- 

 hibitor fiber branches terminate on: 

 DA, dendritic arborizations; LNS, 

 large neuron soma; and Np, neuro- 

 piles. Branches also go out into the 

 cardiac muscle and may have term- 

 inations in the muscle itself. Entire 

 ganglion 1-2 cm long; width is ex- 

 aggerated (Maynard, 1954). 



post. 



