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[Synapses of the human brain in early prenatal ontogeny]
Biulleten' Eksperimental'Noi Biologii I Meditsiny
|March 1, 1988
Insights
Early human brain development involves synaptogenesis, the formation of connections between neurons. Researchers observed the first synapses in 7-week-old embryos, primarily in the cerebral cortex
Area of Science:
- Developmental Neuroscience
- Neurobiology
- Human Embryology
Context:
- Investigating the initial stages of neural circuit formation in the human brain.
- Utilizing electron microscopy for high-resolution analysis of early embryonic brain tissue.
Purpose:
- To identify the timing and location of the first synaptic connections in the developing human cerebral cortex.
- To characterize the cellular localization of these early synapses.
Summary:
- Synaptogenesis, the formation of neuronal connections, was studied in 7-8 week human embryos.
- The earliest synapses were observed at 7 weeks gestation within the marginal zone of the presumptive cerebral cortex.
- These initial synapses were found on the cell bodies and processes of Cajal-Retzius neurons.
Impact:
- Provides foundational insights into the timeline of early human brain development.
- Suggests a potential functional role for embryonic synaptogenesis in cortical maturation.
- Establishes a baseline for understanding neurodevelopmental processes and disorders.
Abstract:
Synaptogenesis in presumptive cerebral cortex was studied in 7-8 week human embryos by electron microscopy. The first synapses in the regions studied appeared in 7-week embryos. These synapses were detected only in the marginal zone of the developing human cerebral cortex, where they were localized on the somas and processes of the young Cajal-Retzius' neurons. A functional role of early embryonic synaptogenesis in the developing human cerebral cortex is suggested.