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Myelin is formed by oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system.Therefore, the first stage of myelinogenesis is often defined as the differentiation of oligodendrocyte progenitor cells (OPCs) or Schwann cell progenitors into their mature counterparts, [4] followed by myelin formation around axons.
[58] [64] For example, the hippocampus continues to develop after birth and is a structure that is affected by childhood maltreatment. [64] Early life stress seems to interfere with the overproduction of synapses that is typical in childhood, but does not interfere with synaptic pruning in adolescence.
The process of generating myelin is called myelination or myelinogenesis. In the CNS, oligodendrocyte progenitor cells (OPCs) differentiate into mature oligodendrocytes, which form myelin. In humans, myelination begins early in the 3rd trimester, [ 11 ] although only little myelin is present in either the CNS or the PNS at the time of birth.
Myelination is only prevalent in a few brain regions at birth and continues into adulthood. The entire process is not complete until about 25–30 years of age. [24] Myelination is an important component of intelligence, and white matter quantity may be positively correlated with IQ test results in children. [24]
Pruning starts near the time of birth and continues into the late-20s. [2] During the pruning of a synapse, both the axon and the dendrite decay and die off. Synaptic pruning was traditionally considered to be complete by the time of sexual maturation, but MRI studies have discounted this idea. [3]
Kennedy Johnson was 15 years old when she gave birth to a baby girl in a Detroit foster home for teen moms, in February 1996. Twenty-five years later, when Johnson found herself in northern Ghana ...
A hospital claimed it didn't have the "capacity" to care for a mom in labor, which caused her baby to die of infection at 35 hours old, a lawsuit alleges
Breakdowns of the generations can vary slightly, but per McCrindle, boomers were born from 1946 to 1964; those in Generation X were born from 1965 to 1979; millennials were born from 1980 to 1994 ...