310 



PLATE X. 



FIGURE 1 . 



Type of fibre arrangement in the calcarine or visuu-sensory area. Drawn from a transverse 

 section through the middle of the posterior calcarine fissure, and from the inferior wall of the same 

 fissure. 



Z = zonal layer. S = supraradiary layer. G = line of Gennari or Baillarger. R = radiary zone. The 

 right-hand numbers and brackets indicate the corresponding position occupied by the various nerve 

 cell laminae. 1 = plexiform layer. 2 = layer of small pyramids. 3 = layer of medium-sized pyramids. 

 4 = large stellate cells. 5 = small stellate cells. 6 = solitary cells of Meynert. 7 = fusiform cells. 

 The cortex is shallow because the drawing is from the sulcal wall. The fibre wealth in general 

 is not great. The zonal and supraradiary layers are uninteresting. 



The prominent line of Gennari is seen to occupj"- the same level as the 4th layer of cells, 

 the upper third excepted. The relatively pallid zone below corresponds with the pronounced layer 

 of small stellate cells. The long fibres in the radiary zone are most numerous at the level of the 

 solitary cells of Meynert. 



FIGURE 2. 



Type of fibre arrangement in the occipital or visuo-psychic area. 



From a section of the superior occipital gyrus 2 cm. anterior to the tip of the lobe. 



Z = zonal layer. S = supraradiary layer. B = line of Baillarger. R = radiary zone. The right- 

 hand figures and brackets indicate the corresponding position held by the cell layers. The fibre 

 wealth of the part is great. (Compare it with the common temporal type, Plate XI\ f . figure 1.) 

 The dense line of Gennari has vanished. Note the wealth of transverse fibres in the radiary 

 zone. 



