THE NEBVOUS SYSTEM 



347 



Pia mater 

 Molecular 



Horiyon.ta.1 



cells 

 Superficial 



fibres 



Smaller 

 pyramids 



La^ge stellate 

 cells and 

 Granules ( 



Broad stripe 



o/ 



tangential 

 fibres 



Granules 



Large 

 pt/ramt,ds> 

 Tangential 

 fibres 



Polymorpk 

 cells 



White 

 matter 



FIG. 24. VERTICAL SECTIONS OF THE CORTEX OF THE CEREBRUM A, OF THE VISUAL SENSORY ; 

 B, OF THE VISUAL ASSOCIATION AREA. 



Between the two sections are shown the principal types of cell, at the levels at which they are 

 severally found : a, small pyramid ; b, medium-sized pyramid ; c, large pyramid. The 

 size of a pyramid is an indication of the distance to which its axon extends before branch- 

 ing ; the longer its traject, the more widespread, it would seem, is its terminal arborization. 

 The axon of c, one of the very large pyramids found in this association area, passes to the 

 front of the cerebrum, where it breaks up in an association area of the tactual sense of the 

 hand, or of sensations concerned with the regulation of gait, or in a centre for movements 

 of the eyeball, d, a tangential cell of the surface ; e, a Golgi cell with ramified axon ; 

 /, a polymorph cell, with its axon directed towards the surface. In sensory areas, tangen- 

 tial fibres and granules are more numerous ; in association areas, small and medium-sized 

 pyramids. 



