CNS Development Flashcards
What is the definition of Embryo?
1st 8 weeks after conception
What is developing 18-28 days after conception?
neural tube
how does the CNS develop?
bottom up after neural tube closes
what develops first after the neural tube closes?
spinal cord
what does the brain look like at the end of the first trimester?
“primitive”- midbrain, forebrain and hindbrain
What is a fetus?
second trimester, months 3,4,5
When does the brainstem develop?
second trimester, months 3,4,5
When do reflexive breathing, sucking and swallowing movements begin?
as a fetus, 2nd trimester, months3,4,5
What is happening with the neurons as a fetus?
they are forming, proliferating, differentiating and migrating
What begins to develop in the 3rd trimester?
cerebral cortex
What areas of the cerebral cortex develop first?
primary motor and primary sensory cortices
When do synapses begin to form?
at birth
How much does the baby brain weigh at birth?
a quarter of the adult brain
when does myelination occur?
at birth through the early 20s
what synapses start to “bloom” first
sensory, then motor, then higher levels of thinking like reason and judgment
