76 



CHARLES BROOKOVER 



ganglion cell outside the limits of the nervus terminalis and not 

 far from a blood vessel. This section shows two other vessels 

 which are the main branches of the internal carotid artery at 

 this level. As the right nervus terminalis is followed caudad it 

 becomes somewhat smaller and finally is lost in this preparation 

 on account of poor fixation at this depth because the cranial 

 cavity was not opened when the fish was killed and fixed. It 

 will be shown later that the nervus terminalis joins the olfactory 

 bulbs ventro-mesially and that the number of ganglion cells 

 increases at this point in the adult. 



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nenrns terminalis -^ 



Fig. 12. From same series as figs. 10 and 11, but farther caudad within the cran- 

 ial cavity near the olfactory bulbs. The blood vessels are quite near the nervus 

 terminalis. A nerve cell is located between the nervus terminalis and the most 

 dorsal vessel shown. X 340. 



In the above mentioned Weigert preparations the blood cor- 

 puscles are stained a beautiful light blue, and since the blood 

 vessels can be traced with great ease and they probably have 

 the same distribution in the adult, they will be described here. 

 Allis ('97) shows that the internal carotid artery enters the cran- 

 ial cavity near the optic chiasm and sends a branch rostrad. As 

 was said previously, this artery shows beneath each olfactory 

 nerve intracranially (figs. 11, 12). Possibly it passes forward 



