prenatal phase (1 marzo 1 anni a. C. – 1 gen 0 anni)

Descrizione:

from conception to birth - 9 months
prenatal development in six steps:
1. Neurogenesis: mitotic division of nonneural cells to produce neurons
2. Cell migration: the massive movement of nerve cells/their precoursors to establish nerve cell populations -> (brain) nuclei, layers of cerebral cortex etc.
3. Differentiation of cells into distinct types of neurons or glial cells
4. Synaptogenesis: establishment of synaptic connections as axons and dendrites grow
5. Apoptosis: selective death of many nerve cells
6. Pruning: synapse rearrangement; loss of some old connections and development of others to refine synaptic connections -> keep what we need, drop what we don't

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