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An electron microscopic study of myelination of pyramidal fibres at the level of the pyramidal decussation in the human fetus.
W Woźniak, Ronan O’Rahilly
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Abstract
The ultrastructure of pyramidal fibres at the level of the pyramidal decussation was studied in a 23 week-old human fetus (220 mm. C.-R.). It was found that the fibres are mainly unmyelinated. However, well-myelinated fibres were scattered above the pyramidal decussation and they were also present below the decussation in both the anterior and the lateral corticospinal tract. Within the tracts, well-differentiated glial cells were observed.