VI Journal of Compakativk Neurology. 



24. The pfro)i('iis profiiinf IIS supplies the iuijacent sides of the second 

 and third toes. 



25. The phnitares lateralis and mcdialis anastamose within tlie 

 adductor obliquus halucis, which both supply. 



26. The flexor digitorum brevis is innervated from the plaiitaris 

 lateralis. 



27. Three isolated cervical sympathetic ganglia besides the stellatum 

 are present. 



28. The ganglion meseraicum mediiiin, which is wanting in man, 

 lies between the coeliac plexus and the aorticus. Especial emphasis is 

 laid upon the great distinctness of parts in the lumbosacral plexus. The 

 analysis of this plexus has proven impossible in man, but in the present 

 case the several nerves may each be followed to the plexus, excluding 

 any doubt as to their origin. In this, as in the brachial plexus, a ventral 

 and dorsal portion may be distinguished. Thus a distinct advance is 

 made in settling the homologies of the limbs. In general only related 

 nerves can substitute for each other in the innervation of a given group 

 of muscles. Ventral muscles can only be supplied by ventral branches 

 of spinal nerves and vice versa. 



The Origin and Centr.\l Course of the Eighth Nerve. (•) 



These observations are based on the study of sections stained by 

 Weigert's method after destruction of the auditory organs from the cer- 

 vical aspect. In cases where the cochlea alone was injured there was 

 atrophy of the posterior root of the eighth, the anterior nidulus of the 

 acusticus and the tuberculum laterale. There was also a reduction in 

 the number of fibres in the corpus trapezoides and the upper olives. 

 Farther cephalad there was evidence of degeneration in the ventral 

 fillet of the opposite side, which could be traced as far as the arm of the 

 testes. The strise medullares were somewhat atrophied, enabling 

 Baginsky to trace their course as follows: Passing from the tuberculum 

 laterale of the medulla and in part from the anterior acusticus nidulus 

 they pass ectad to the restiforme, crossing dorsally to the median side 

 and there divide into two bundles, both of which pass to the upper olives, 

 though a few fibres enter the arcuate bundles. The decussation is com- 

 plete in the corpus trapezoides, as stated by Fleschsig. Serious opera- 

 tive difficulties stand in the way of the destruction of the anterior 

 branch of the eighth and in the experiments cited only partial success 

 was secured. The fibres from the anterior root lie upon the median sur- 

 face of the restiforme. Farther cephalad there appears another bundle 

 lying ventrad which arches ventrad, to be lost in the formatio reticularis. 

 Still a third tract from the same root radiates from the ventral aspect of 



I Ueber den Ursprung und den centralen Verlaiif des Nervus acusticus des 

 Kaninchens un<l der Katze. B. Baginskv. Math, u, naturwiss. Mitth., Berlin, Akad. 

 1889, VL, pp. 441-445. 



