By Priv.-Doz. Dr. med. K. J. Zilles (auth.)
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Extra resources for Ontogenesis of the Visual System
Example text
All other cytological signs are as for the nucleus nervi oculomotorii. 3. Myeloarchitectonic Well-myelinated fibres, forming the dorsolaterally oriented fibres of the nervus trochlearis, can be seen on the 43rd day of ontogenesis. The subsequent changes are analogous to those described for the nucleus nervi oculomotorii. 4. Fibrilloarchitectonic The dorsolaterally directed fibres of the nervus trochlearis can be seen on the 39th day of ontogenesis. All other changes are analogous to the changes described for the nucleus nervi oculomotorii.
8) Ilm. 2. Embryonal Stage Nuclei without distinct amounts of cytoplasm are visible on the 36th day of ontogenesis. The packing density is about ten times higher than in the adult. The round to oval nuclei [diameter about 7 (5) Ilm] are darkly to very lightly stained and contain one to five, mostly two to four, eccentric and dark-stained nucleoli which are not always distinguishable from larger heterochromatin particles. 3. Neonatal Stage The first oval to polygonal larger perikarya with a diameter between 20 and 23 (14 and 16) Ilm are visible.
There is an increasing gradient of packing density in lamina 2 from the periphery to the inner part. A few individual vertical or horizontal fibres and numerous very densely packed, sagitally oriented fibre bundles are seen in lamina 3. These fibre bundles are markedly reduced in their packing density in lamina 4 and an increase in thick, vertically oriented single fibres has occurred. These single 41 fibres can be found also in laminae 5 and 6. Fibre bundles oriented from ventrolaterally to dorsomedially are visible in lamina 5.
