Time-course analysis of SVZ proliferation and progression of ridge
migration. There is an initial proliferation of SVZ cells (arrowhead in
a) in the first week of TGFα infusion into the
caudate-putamen (CP) (a), followed by an en masse
migration of the ridge into the striatum (arrowhead), starting at 9
days of TGFα infusion (b), progressing to the
midstriatum by the 14th day (AC, anterior commissure)
(c) *, Lateral ventricle. Septal infusions
resulted in a medially directed EGFr-mRNA positive “septal” ridge
(d, arrowhead a) originating in the medial SVZ adjacent
to the striatum (d). Several other migration patterns
can be seen, for example a colossal ridge (d, arrowhead
b) or in the septum of the contralateral medial SVZ after striatal
TGFα infusions (e).