|
Core |
Lateral Belt |
Internal Parabelt |
External Parabelt |
Tpt |
|
Small cells, densely packed in
layers 2-4, with indistinct laminar borders. Broad layer 5 appears
as clear stripe. |
Less
densely packed layers 2-4, with increased column spacing
compared to core, and distinct laminar boundaries. Distinct
3c with large cells. Increased cell density of layer 5 relative to
core. |
Reduced
cell density of layer 4
compared to lateral belt. Long columns of cells in layer 3,
with columns often extending from layer 2-6. |
Reduced
cell density of layers 2 and 4 with increased column spacing
compared to internal parabelt. Loss of regular alignment of
pyramidal cells at border of layers 3 and 4. |
More
homogeneous cell density in layers 2-6
than in parabelt, though all layers discernable. Cells of
lower layer 3 and upper layer 5 fuse with layer 4 to create a broad
central band. |
