'^ 



— 55 — 



(f) Posterior Root Ganglion Stained in Osmic Acid. 



Tlie posterior ri)ot j^jangliou of a siniill luaininal was Imrdened 

 ill Ilenuanii'.s solution, euiliedded in paralliii, and sectioned longi- 

 tudinally. Fix tlie section to tiie slide, and nunint in balsam. 



Study under low power. Observe that the fibrous cap- 

 sule around the ganglion is continuous with the epineuriuni 

 of the in-coniing and uut-going nerve trunk. The nerve 

 fibres are stained bhick. Tlie nerve trunk l)reaks u[) into 

 several smaller bundles after it enters the ganglion. Be- 

 tween these Inindles may be seen groups of ganglion cells, 

 round or oval in siiape, with prominent nuclei and nucleoli. 

 They are stained a faint Itrown color. The cells are sur- 

 rounded by a nucleated capsule. Sketch the ganglion 

 under low ])ower. 



(g) Posterior R^ot Gingli:)n Stained in Hsema- 



toxylin. 



The posterior root L'anglion of a dog wasiiardened in mercuric 

 cldofide, stained in Delafield's hsematoxylin, em])edded in j^araliin, 

 and sectiiiiied lnu^itudiually. Fix to tlie .slide, and niDimt in l)al.sam. 



Study first under low pawer, and observe the structure 

 as described for (f) of this lesson. Sketch a number of 

 the cells with the .intervening nerve fibres as seen under 

 high power. 



DRAWINGS FOR LESSON XIV. 



