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Activity-independent mechanisms are generally believed to occur as hardwired processes determined by genetic programs played out within individual neurons.

These include differentiation, migration and axon guidance to their initial target areas.

A groove forms along the long axis of the neural plate and, by week four of development, the neural plate wraps in on itself to give rise to the neural tube, which is filled with cerebrospinal fluid (CSF).

As the embryo develops, the anterior part of the neural tube forms a series of bulges called vesicles, which become the primary anatomical regions of the brain: the forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon).

Although synapse formation is an activity-independent event, modification of synapses and synapse elimination requires neural activity.


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