Early cytoarchitectonic development of the anlage of the basal nucleus of Meynert in the human fetus.
The present study describes a short period of cytoarchitectonic development of the anlage of the basal nucleus of Meynert between 9 and 15 weeks of gestation (crown-rump length 42-120 mm). On the basis of temporo-spatial reconstruction of the cytoarchitectonic pattern within the basal telencephalon it was evident that magnocellular aggregations of the basal telencephalon contain the most differentiated cells in the whole prosencephalon of the 15-week-old human fetus. At this stage development many magnocellular islands can be observed in the sublenticular region. However, it seems that they are in antero-posterioral continuation and the real number of magnocellular islands is much smaller than observed in a single section. The most voluminous magnocellular aggregations are situated around the temporal limb of the anterior commissure and below the ventral pallidal surface in the 15th week of gestation. Between 12 and 15 weeks of gestation, at the most rostral levels, the distinct cell group appeared with unique cytoarchitectonic properties ('albino cell group'). This cell group is situated close to the ventral putaminal surface within the capsula externa fibres and it corresponds to the subputaminal nucleus of Ayala.
Kracun
I
I
Department of Chemistry and Biochemistry, Medical Faculty, University of Zagreb, Yugoslavia.
Rösner
H
H
D001479:Basal Ganglia / Q000196:embryology*; D005314:Embryonic and Fetal Development; D005865:Gestational Age; D006801:Humans; D013377:Substantia Innominata / Q000166:cytology / Q000196:embryology*