636 E. 11. ,1. sciiusTKj;. 



interspersed with a few small pyramidal cells; this extends 

 from •4-"55 mm. (2) A middle layer, "25 mnj. wide, corre- 

 sponding to Campbell's layer of large stellate cells. This is 

 rather poorer in cells than the rest of the cortex, being the 

 region occupied by the stria of Gennari. A considerable 

 number of cells are, howevei-, present, and these seem to be 

 concentrated rather nearer to the upper than to the lower 

 border. 'The most conspicuous are the large stellate cells 

 themselves, the length and breadth of which may be about 

 25^. The majority of these seem to be in the form of ratlier 

 broad pyramids, sending out an apical process and horizontal 

 basal processes. Scattered among them are granules and 

 smaller pyramids. (3) The lower layer of granules extends 

 from a depth of -8 to a depth of T15 nnn. This can be clearly 

 subdivided again into an upper layer of large pyramidal and 

 irregulai'-shaped cells and a lower layer consisting almost 

 entirely of small granules. The lamina ganglionaris is com- 

 paratively poor in cells, and the cells themselves are small. 

 The solitary cells of Meynert, which aie reckoned to belong- 

 to this layer, are actually sunk within the upper part of the 

 underlying lamina multiformis; they are nut very numerous, 

 and only one of them is shown in the drawing; m size they 

 may be about 30 /n in length by about the same breadth. 

 The lamina multiformis is very narrow, but richer in cells 

 than the layer above it; the cells themselves are small. 



Extent and Boundaries. — The caltarine cortex is on 

 the mesial surface largely confined to the calcariue fissure ; at 

 the posterior bilurcation of the latter it emerges on to the 

 surface and covers the whole area lying behind it. Spreading 

 on to the lateral face of the hemisphere it occupies the greater 

 part of the large area, bounded in front by the sulcus lunatus, 

 to the lip of which it almost extends. It^ covei's the walls of 

 the lateral occipital fissure. jS'ear the occipital pole it does 

 not extend much belov/ that sulcus, but in front it spreads 

 downwards much farther, yet always falls far short of the 

 sulcus occipitalis inferior. 



