|
|
| During
the development of the brain it grows at an amazing rate. And while the
brain is being developed 250,000 neurons are being added on every minute! At birth, almost but not all the neurons we need and have will be there. But still for a few years after birth the brain keeps growing. Then by around the age of 2, the brain is actually 80% of the adult size!
Then sometime over
the next few days something called a “trench” is At the front end
or part of the neural tube, three major brain areas are formed: 1. The prosencephalon (the forebrain) 2.
The mesencepalon (midbrain) By the 7th week
of development these three areas divide again.
C.
P. |
Some
people wonder, and you might too! How does the brain keep growing if
you get almost all the neurons when you are born? We can answer that
for you!! The answer is glial cells. Glia keeps dividing and multiplying
~ continuously! It carries out lots of important functions for the normal
brain function counting insulating nerve cells with myelin. The neurons
in the brain also make many new connections after birth. The nervous
system develops from embryonic tissue called the ectoderm. On about
the 16th day of developing the nervous system the first sign you would
see is the neural plate.
formed in the neural plate - this creates a neural groove. By about
the 21st day of this being developed a neural tube is formed. This usually
happens when the edges neural groove meets. The rostral (which is the
front part of it) part of the neural tube goes on to develop into the
brain and the rest of the neural tube develops into another thing called
the spinal cord. Neural crest cells become the peripheral nervous system.