Chapter three question - Mackenzie Gayer Chapter Three...

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Mackenzie Gayer Chapter Three- Question 4 PY344 Question 4 Normal brain development includes neurogenesis which is the rapid increase in neurons by mitosis. This process begins 42 days after conception and is pretty much complete by the halfway point of gestation. This means that babies are born with pretty much all fo the neurons they will have when they are adults. You still do create new neurons throughout your life an example would be moments of learning and there is an increase in the number of neurons in your hippocampus. After birth the neurons stat on the next process, which is migration to their final destination (which is commonly from the inner brain to the outer neocortex). Radial glial cells help neurons reach their final destination as the brain increases in size. The third step is cell growth and differentiation which occurs once the neurons have reached their final destination. Neurons then grow an axon and dendrites and now can take on certain structural and functional characteristics specific to the region of the brain that they are located in. Axons grow as they reach toward specific targets. Dendrites undergo arborization, which is a huge increase in the size and number of branches, and the formation of spines on the dendrites. This increases the neurons' capacity of connections it can make with other neurons.

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