114 CHARLES BROOKOVER 



5. About one thousand nerve cells develop from the embryonic 

 ganglion during late stages. Most of these lie in the nasal 

 capsules in the adult but a few are found intra-cranially on the 

 ventral side of the olfactory nerve in a more or less distinct ramus 

 of this nerve. 



6. The cells of the nervus terminalis lie in the dorsal sulcus 

 between the two rami of the olfactory nerve in the adult nasal cap- 

 sules. A few of them are scattered slightly dorsad of this position. 



7. The nerve processes of the cells of the nervus terminalis 

 in the adult possess neurofibrils and tigroid bodies are found in 

 their cytoplasm, thus showing that they are functional nerve cells. 



8. These cells show the three main forms characteristic of 

 sympathetic ganglion cells. 



9. Some of their nerve processes follow the arteries, while others 

 arborize about other cell bodies of the ganglion of the nervus 

 terminalis. 



10. Not more than about forty axones of the thousand ganglion 

 cells of the .adult were found joining the olfactory bulbs. Many 

 of these fibers pass through the bulbs to end in the prosen- 

 cephalon proper. 



11. Ganglion cells of the same general character were found 

 increasing slightly in numbers as the nervus terminalis approaches 

 the olfactory bulbs. 



12. We have confirmed Allis in finding fibers that seem to 

 belong to the nervus terminalis continuing caudad ventrally 

 of the olfactory bulbs to the region of the optic chiasm. These 

 fibers were not found to enter the brain, as Allis seems to have 

 suspected they would do, probably on account of the condition 

 described for Protopterus; but connect with the post-optic 

 sympathetic system by way of an intra-cranial sympathetic system. 



13. Golgi and Cajal preparations show that the blood vessels 

 everywhere within the cranial cavity are innervated. Also, 

 the paraphysis is innervated. 



14. A ramus of the trigeminus nerve, probably derived from 

 the profundis nerve, enters +he cranial cavity dorsally opposite 

 the anterior commissure. Some of these fibers are medullated and 

 supply the paraphysis tubes. 



