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FIG 6. The outlines of the corona radiata appear after 28 weeks of gestation. Gallyas staining (A and B, 33-week-old preterm neonate) and MR image (C, 36-week-old neonate). The peduncular part of the corona radiata corresponds to the major frontal crossroad area (C1 in A); however, the centrum semiovale (asterisk in A) still displays signs of immaturity and corresponds to the crossroad area C2. This is manifested as pale (ie, poorly myelinated) area in Gallyas-stained sections (C2 in A) and as patches of decreased MR imaging signal intensity in T1-weighted MR images (C, asterisks). Note that tangential stratification of sagittally oriented fibers is still well preserved in the occipital white matter (B) and that temporal crossroad area (C6 in A) is still poorly myelinated in the preterm neonate.
