Glossary of Neurosciences 3.19 -- Neuroembryology
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- the NS and the neuro-epithelium are derived from what?
- embryonic ectoderm
- the CNS specifically takes origin from what?
- the neural plate
- the PNS specifically takes origin from what?
- neural crest
- spina bifida
- general definition
- failure of the dorsal portions of the vertebrae to fuse
- spinal bifida occulta
- usually localaized in the sacrolumbar region, and though there is a failure of the dorsal portions of the vertebral column to fuse, there is no protrusion of intraspinal contents to the surface
- the meninges of the spinal cord bulge through the defect in the vertebral column; does not involve any neurological abnormalities
- both the meninges and neural elements bulge through the defect in the vertebral column
- complete raschischisis
- neural tube remains unclosed and the defective spinal cord lies exposed on the infant's back
- most of the frontal and parietal bones are absent with the forebrain appearing as a hemorrhagic mass
- a condition in which the gyri are abnormally broad
- a condition in which there is virtual absence of gyri and sulci
- the inferior olivary nucleus arises from the . . .
- sulbopontine extension
- what does the floor plate give rise to?
- ventral white commissure
- where do the anterior and hippocampal commissures originate?
- from portions of the lamina terminalis
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