THE MAMMALIAN NERVOUS SYSTEM 59 



213; p. 205; Rauber-Kopsch ('07), Fig. 655, p. 579; Toldt ('04), 

 Fig. 1215, p. 789; Villiger ('12), Fig. 230, p. 272. 



(10) Medial geniculate body and red nucleus. See Luciani 

 ('15), Vol. Ill, Fig. 244, p. 489; Piersol ('13), Fig. 963, p. 1114; 

 Quain ('09), Fig. 213, p. 205; Rauber-Kopsch ('07), Fig. 656, p. 

 580; Spalteholz ('09), Fig. 733, p. 660; Toldt ('04), Fig. 1218, p. 

 791; Villiger ('12), Fig. 231, p. 274. 



(11) Middle of thalamus. See Bailey ('16), Fig. 357, p. 533; 

 Piersol ('13), Fig. 967,-p. 1120, and Fig. 974, p. 1126; Quain ('09), 

 Fig. 261, p. 261; Toldt ('04), Fig. 1219, p. 792. 



(12) Upper part of thalamus behind the anterior commissure. 

 See Quain ('09), Fig. 300, p. 316; Toldt ('04), Fig. 1220, p. 792. 



Put each outline on a separate sheet and fill in additional 

 details at a later time as directed below. Study the surface 

 contour of each section drawn, and by comparison with the 

 external form of the cord and brain determine the approximate 

 location of the section. An intact brain or medulla oblongata 

 should be at hand during this comparison. The finished draw- 

 ings will include only selected details of the structures visible 

 in the sections. Do not complete the drawing of each cross-section 

 before passing on to the next; but study each fiber tract or 

 nucleus as a whole, following it throughout the series of sections 

 and entering it upon the drawing of each level in which it ap- 

 pears, as directed below, until all the tracts to be studied have 

 been entered upon the sketches. In these sketches each tract 

 and nucleus should in general be entered on one side only, so as 

 to avoid unnecessary complexity in the finished drawings. In 

 general the ascending tracts should be entered on the right 

 side and the descending tracts on the left side. Of course, tracts 

 which decussate will appear on one side in part of the levels and 

 on the other side in other levels. 



The separate tracts and centers may well be drawn in differ- 

 ent colors of wax crayons. In the illustrations of the functional 

 analysis of the peripheral nerves in the literature certain systems 

 of nerve components are generally conventionally colored, and 

 on the basis of that usage the following color scheme is sug- 

 gested. For the basis of the classification employed, see Sec- 

 tions 15 to 19, 47, 52 to 57, 67, and Herrick ('15), Chapters V 

 and IX. 



