). The medial aspect shows the calcarine fissure (f.c.) with its prominent dorsal and inferior gyri.

These are evident even with strong de-staining of the specimen due to the white matter strips running within the cortex as well as the sagittal running sulcus of the cuneus (cu.). The posterior horn is not yet visible on this section. Also the callosal fibres have not yet united to form a distinct layer. The medial aspect of the white matter offers only two layers that are concentric and form a triangle with the dorsal tip and a ventral base. This triangle is roughly equal to the size of the calcar avis. The light layer in the middle is the stratum sagittale internum (1.), the lateral darker layer the stratum sagittale externum

(2.). The white matter towards the STI571 cortex, which is the white matter of the occipital lobe, the stratum profundum convexitas (10.) is stained relatively light, the strata propria of the cuneus (5.) of the three occipital sulci (6,7,8) and the sulcus collateralis are stained slightly darker. Even darker, yet lighter than the stratum sagittale externum, is the stratum calcarinum (4.), which is located between the latter and the cortex of the calcar avis. The same shade is evident for the stratum transversum cunei (3.), which jointly originates with the latter fibres from the cuneus and runs dorsal and lateral to the stratum sagittale http://www.selleckchem.com/products/GDC-0941.html externum. This [3.] can be followed as a slim grey strip on the lateral aspect of the stratum sagittale externum to the inferior lateral margin. Hence, this plane shows a total of five encapsulated layers, which differ in their staining intensity and can therefore be separated. The stratum profundum of the convexity (10.) is lightly stained whilst the layers of the sulci (6,7,8,9) are easily differentiated due to their darker stain as

we have already seen on previous sections. Endonuclease Exceptionally dark – nearly comparable to the stratum sagittale externum – are the stratum calcarinum (5.) and the stratum transversum cunei (4.) whose common origin in the cuneus is clearly visible. At the lateral dorsal border of the cortex, the stratum tranversum cunei forms a helm-shaped cap, which is formed by its dorsally projecting fibres. It thence continues as a slim stripe at the lateral surface of the latter with the result that it nearly reaches its latero-inferior border. 4. This cut is located approximately 30mm anterior to the previous one and approximately 60mm away from the occipital pole. The majority of this section is not located in the occipital lobe anymore. The lateral aspect shows the dorsal parietal lobe (I.) and underneath it the inferior part of the angular gyrus (II.). The medial aspect shows the precuneus (VIII.) and – as the most anterior part of the occipital lobe– the anterior termination of the cuneus, which is thinning to remain as slim stripe (VI).