342 



HISTOLOGY. 



pyramidal or cerebrospinal tract traverse the pons, together with a bundle 

 which ascends beyond the trigeminal fibers and then turns back to enter 

 the cerebellumi through the brachium conjunctivum. (This 'group of 

 fibers ascending to the cerebellum is found in the superficial ventro-lateral 

 fasciculus of the cord, and is known as Gowers' bundle.) The brachium 

 conjunctivum contains fibers from the cerebellum, which decussate in the 

 mid-brain; some of them terminate in nuclei which send branches through 



the pons and down the lat- 



eral bundles of the cord; 



others pass into the cord 



directly. 



Gray stratum. 



. *' Medulla. 



CEREBELLUM. 



The medullated nerve 

 fibers of the brachia and 

 restiform body form an ar- 

 borizing medulla which ex- 

 tends into the small sub- 

 divisions of the cerebellum 

 as shown in Fig. 397. This 

 medulla of white substance 

 is surrounded by a cortex 

 consisting of an inner gran- 

 ular stratum, a middle 

 ganglionic stratum (present- 

 ing in section a single row 

 of large cell bodies) , and an 

 outer gray stratum. 



The inner granular 

 stratum, which is rust-col- 

 ored, consists of many layers of small cells which by ordinary methods 

 show relatively large nuclei and very little protoplasm. With the Golgi 

 method it appears that besides neuroglia cells, two sorts of nerve cells are 

 present, the small and large granule cells; the former (Fig. 398) are 

 multipolar ganglion cells with short dendrites having claw-like terminations, 

 and a slender non-medullated neuraxon which ascends perpendicularly to 

 the outermost layer and there divides in T-form into two branches. The 

 branches run lengthwise of the transverse folds or convolutions of the 

 cerebellum so that they are cut across in sagittal sections (Fig. 398); they 

 are parallel with the surface and have free unbranched endings (Fig. 399). 

 The small granule cells form the bulk of the granular stratum. The less 



FIG. 397. FROM A SAGITTAL SECTION OP THE CEREBELLUM 

 OP AN ADULT MAN. X 12. 



