228 



TWENTY-SECOND LECTURE. 



The former, I to 0.5 mm. thick, has crowded and stratified 

 granules, that is nucleus like structures or, more properly 

 said, small cells ofo.0067 mm. They remind one of the sub- 

 sequently to be described elements of the retina of the eye, 

 and, like the latter, give off the finest filaments from both 

 poles (Fig. 189, below). 



Whether these granules of the cerebellum are of a nervous 

 or connective-tissue nature is still undecided. 



The gray stratum contains a simple layer of large remark- 

 able ganglion cells. Purkinje described them forty years ago. 



They send downwards an axis- 

 cylinder process id), and up- 

 wards or outwards a system 

 of antler-like ramified proto- 

 plasma processes (c). The 

 finest terminal branches of the 

 latter (Hadlich) are said to 

 bend over (a) in a loop-like 

 manner at the surface, and 

 return to the rust-colored 

 layer. 



Connective-tissue support- 

 ing fibres (r) form a special 

 boundary layer at the surface. 

 The pedunculi cerebri re- 

 ceive ascending masses of 

 fibres from the medulla ob- 

 longata and cerebellum ; they 

 also receive others which de- 

 scend, from the cerebrum to 

 the medulla oblongata. Their 



Fig. 189. — The cortex of the human cerebellum 

 in perpendicular section. Two Purkinje's cells, SlipeiTOr TOUnded DOl'tlOn 



beneath them a portion of the granular layer ; d, _ 



the lower, c. .the upoer process of the former. At (cap) is Separated from tile 

 r, supporting fibres ; at a, the loop-shaped V * ' *■ 



bends of the finest cell processes; c, tangential inferior Semilunar (basis) pOr- 

 thmnest nerve fibres. ' A 



tion by a dark substance. 

 Black pigmented multipolar ganglion cells occur here. 



The so-called cerebral ganglia consist of the corpora 



-C 



