Many aspects of neuronal development continue during postnatal life. Continued elaboration and refinement of neuronal connections, synaptic connectivity, and neuronal and glial genesis are examples. Postnatally, experience-driven influences gain importance in molding the structure and function of the CNS. Postnatal development involves the melding of genetically driven events with those influenced by experience. CNS development is an early and lifelong process requiring a precise order of events to occur at particular times, depending on genetic, molecular, and environmental factors.