NERVUS TERMINALIS: TURTLE 433 



strands could not be told apart distal to this point. The relation 

 of the two nerves and something of their appearance are repre- 

 sented more highly magnified in figure 8, but this does not show 

 the slight although clearly apparent differentiation of staining 

 which the preparations themselves reveal in the larger bundles. 

 The trigeminal fibers appear coarser and more compactly collected 

 into bundles than do those of the terminalis, but in the smaller 

 strands these characteristics are not apparent, probably because 

 of the small number of fibers composing them. 



The olfactory and vomeronasal bundles, which are also rep- 

 resented in the figure, resemble each other in being composed of 

 very delicate fibers with a characteristic wavy appearance which 

 could not be well represented in the drawing. 



Huber and Guild ('13) in the rabbit and Brookover ('17) in 

 the human found indications of such an anastomosis of terminalis 

 and trigeminal strands on the nasal septum, and the pres- 

 ent writer ('18) partially demonstrated it in the cat. It is 

 rather striking that three nerves, the terminalis, the olfactory 

 (Read, '08), and the trigeminus, should each form a plexus on 

 the nasal septum. Two of these plexuses overlap to a marked 

 degree. The vomeronasal nerve is not plexiform, except as the 

 large bundles composing it branch and reunite to a slight extent 

 in their course to the vomeronasal organ. In this connection a 

 statement from the previously cited paper of Ayers is of interest. 

 He states: "The nasal chamber in man therefore contains the 

 surface distribution of these three (terminalis, septalis, olfac- 

 torius) cranial nerves as well as the surface terminations of in- 

 vading branches of a fourth and more recent cranial nerve, the 

 trigeminus. 



jj 



Fig. 7 Reconstruction from ten sections (175 to 185) of the series from which 

 figure 3 was reconstructed, to show anastomosis between rami of the nervus 

 terminalis and of the ophthalmic branch of the trigeminal nerve. X 44. 



Fig. 8 Reconstruction from four of the sections (sections 182 to 185) in- 

 cluded in figure 7, to show at higher magnification the anastomosis of one of the 

 rami of the ophthalmic plexus with a bundle of the nervus terminalis. This 

 figure also gives some idea of the appearance of the fiber bundles. X 180. 



