CEPHALOPODA 



597 



From the cerebral ganglia there run forward a pair of nerves which 

 end at the border of the buccal mass in a pair oi superior iwrca/ ganglia ; 

 a circumoesophageal commissure links up these with the inferior 



ten.n. 



Fig. 408. Nervous system of Sepia. After Hillig. bra.g. brachial ganglion ; 

 br.g. branchial ganglion and nerve; ce.g. cerebral ganglion; gas.g. gastric 

 ganglion ; rna.n. mantle nerve ; olf.n. olfactory pit and nerve ; op.g. optic 

 ganglion ; s.buc.g. superior buccal ganglion ; st.g. stellate ganglion ; sym.n. 

 sympathetic nerve ; ten.n. brachial nerves ; vis.g., vis.n., visceral ganglion 

 and nerve. 



buccal. From the visceral ganglia there is a pair of nerves running to 

 the very prominent stellate ganglia in the mantle ; there is also a vis- 

 ceral loop which sends off branches to the gills and a sympathetic loop 

 ending in the gastric ganglion between the stomach and the caecum. 



