82 ALBERT KUNTZ 



As development advances, the cells which have advanced 

 peripherally and become incorporated in the ciliary ganglion 

 increase in size less rapidly than the cells which remain in the 

 cerebro-spinal nervous system. In embryos 15 to 20 mm. in 

 length in which the ciliary ganglion is already well established 

 and many of its constituent cells have become differentiated into 

 neuroblasts, the cells composing this ganglion are materially 

 smaller than the cells in the semilunar ganglion. 



Carpenter ('06), in his study of the ciliary ganglion in the 

 chick, observed a constant difference in size between the migrant 

 nervous elements in the ophthalmic nerve and the cells in the 

 anlage of the ciliary ganglion ; the former being materially larger 

 than the latter. He also observed a few cells of the larger variety 

 in the ciliary ganglion. These observations suggested to this 

 author an intrinsic difference between the cells which enter the 

 anlage of the ciliary ganglion by way of the oculomotor and the 

 ophthalmic nerves respectively. As indicated above, the cells in 

 the ciliary ganglion, in advanced embryos of the pig, are mate- 

 rially smaller than the cells in the semilunar ganglion. How- 

 ever, I have never observed any difference in the size or appear- 

 ance of the nervous elements which have become incorporated 

 in the ciliary ganglion, in embryos of the pig, which would 

 suggest an intrinsic difference in these elements. 



Sphenopalatine ganglion 



The sphenopalatine ganglion arises as an irregular mass of 

 loosely aggregated cells lying along the median surface of the 

 maxillary nerve. In the early stages of development, as illus- 

 trated in figure 2, the maxillary nerve is composed of many 

 small loosely aggregated bundles of fibers accompanied by numer- 

 ous cells of ganglionic origin. These cells push out from the 

 periphery of the semilunar ganglion in cone-shaped aggregates 

 into the proximal part of this nerve and, becoming completely 

 separated from the ganglionic mass, many of them advance 

 peripherally along the growing nerve. 



The fiber-bundles composing the maxillary nerve remain loosely 

 aggregated until comparatively late in the course of develop- 



