528 



THE CEREBELLUM. 



Microscopic Structure. The cortical grey matter which covers the foliated surface 

 of the cerebellum is made up of the following elements, viz. : 1. Pellucid cells of 

 considerable size. 2. Cells, for the most part of large size, and caudate, having the 

 usual granular contents. These cells are embedded in a finely granular matrix ; the 

 greater number of those of the caudate kind have a pyriform shape, and are prolonged 



Fig. 360. Fig. 360. THE COLUMNS OP THE 



MEDULLA OBLONGATA TRACED 

 UPWARDS INTO THE CEREBELLUM 

 AND CEREBRUM (from Arnold). | 



a, part of the anterior column 

 which ascends in the olivary column ; 

 6, decussating portion of the lateral 

 column forming the pyramid and 

 turned down ; c, olivary fasciculus 

 ascending deeply through the pons ; 

 d, olivary body ; e, restiform body; 

 /, g, corpora quadrigemina ; c, h, i, 

 the fillet ; h, the part which asoends 

 to the cerebral peduncle ; i, the 

 part passing up to the corpora 

 quadrigemina ; m, m,', the trans- 

 verse fibres of the pons divided ; n, 

 inferior peduncle of the cerebellum ; 



o, septal fibres of the medulla oblongata ; q, fibres of the inferior peduncle continued 

 into the laminse of the cerebellum ; ?, r, superior peduncle ; t, fasciculus teres ; u t 

 thalamus ; v, corpus albicans. 



Fig. 361. Fig. 361. MINUTE STRUC- 



TURE OP THE SUBSTANCE 

 OP THE CEREBELLUM (from 

 Kolliker). 



A, large cells from the 

 grey cortical substance of the 

 human cerebellum. ~ 



a, three large cells exhibit- 

 ing granular contents and a 

 nucleus ; 6, the internal pro- 

 cesses seen in two of the 

 cells ; c, d, two external pro- 

 cesses running towards the 

 surface from two of the cells, 

 in the third cell one large 

 process only is seen; c', d', 

 ramified finer parts of these 

 processes. 



B, course of the nerve- 

 tubes at the surface of the 

 cerebellum, magnified with a 

 low power. 



a, nerve of the medullary 

 substance ; 6, nervus plexus 

 of the substantia ferruginea ; 



c, border of that substance ; 



d, fine fibres running out 

 from the dark -bordered tubes 

 into the superficial grey sub- 

 stance. 



at their small end into a simple or branched appendage, and this process, as first 

 remarked by Purkinje, is in most of them directed towards the surface of the 

 cerebellum. 3. Small bodies, like cell-nuclei densely aggregated without any inter- 

 vening substance. These lie at some depth from the surface; according to Todd, 



