370 ABRAM T. KERR 



lateral fasciculus or seventh cervical nerve. There are only a 

 little over 2 per cent of the plexuses of this type (fig. 6) . 



20. In type D, group 2, like type A, there is a branch from the 

 intermediate trunk to the medial fasciculus but there is no branch 

 from the fourth cervical in this type. There is but one example 

 of this arrangement or slightly over one half of one per cent 



(fig. 7). 



21. Type E, group 2, is exactly like type B, group 1, except 

 there is no branch from the fourth cervical nerve to the plexus. 

 Nearly 30 per cent of the plexuses are of this type (fig. 2) . 



22. Type F, group 3, differs from the preceding only in that 

 but part of the fifth cervical joins the plexus. There is a branch 

 from the fifth cervical nerve to the cervical plexus. Slightly less 

 than 7 per cent of the plexuses are arranged in this way (fig. 3) . 



23. In type G, group 3, there is a branch from the caudal trunk 

 to the lateral fasciculus, otherwise this is just like the preceding. 

 There is only one specimen of this type (fig. 8). 



24. The typical plexuses are those of type B (fig. 1), type E 

 (fig. 2) and type F (fig. 3). 



25. In the 63 bodies, 126 plexuses where there are complete 

 records from both sides of the body, the same type of plexus 

 is found on both sides in over 61 per cent. 



26. Symmetry is more common than asymmetry in the ratio 

 of about 3 to 2. 



27. Asymmetry is found very slightly more often in females 

 than in males. 



28. Asymmetry is found most often in white males, least often 

 in colored males, and more often among colored than white 

 females. 



29. Symmetry occurred only in the plexuses of type B, E 

 and F which are the most common and typical plexuses of the 

 three groups. 



30. Slightly over 71 per cent of the type B plexuses are sym- 

 metrical, 60 per cent of the type F and about 54 per cent of the 

 type E. 



31. Where asymmetry occurs, the cephalic type of plexus is 

 found on the right side in over 62 per cent. 



