ok looking up the lamina dissecans: oh wow. It usually just about COMPLETELY disappears by the 32nd week, making “clean line” of separation between layers III and V in most places. So what happens when born at 28 weeks? Does the layer remain? “4. Layer IV or lamina dissecans, which is one of the most characteristic features of the PrS, it separates the lamina cellularis superficialis from the lamina cellularis profunda, and divides the PrS into external and internal layers, approximately equal in thickness (0.61 mm outer, vs. 0.70 mm inner, excluding layer I, von Economo, 2009).” “4. Layer IV has the appearance of typical lamina dissecans, which shows an almost complete absence of neurons, forming a neat line with both layer III and layer V.”

ok looking up the lamina dissecans: oh wow. It usually just about COMPLETELY disappears by the 32nd week, making “clean line” of separation between layers III and V in most places.

So what happens when born at 28 weeks? Does the layer remain?

“4. Layer IV or lamina dissecans, which is one of the most characteristic features of the PrS, it separates the lamina cellularis superficialis from the lamina cellularis profunda, and divides the PrS into external and internal layers, approximately equal in thickness (0.61 mm outer, vs. 0.70 mm inner, excluding layer I, von Economo, 2009).”

“4. Layer IV has the appearance of typical lamina dissecans, which shows an almost complete absence of neurons, forming a neat line with both layer III and layer V.”