Development Of Nervous System In Inffant And Child

Question 1

Where does neural tissue develop from and around what time? How?

Answer 1

Ectoderm
During 3rd week of development

1. primitive neural tube area produce neurons and form a neural plate
2. completion of neural tube -> neurons migrate: head end of neural tube develops into the brain the rest of neurons migrate causally from spinal cord
3. Formation and migration of spinal nerves to various body parts is normally completed by he end of the second trimester

Question 2

Failure of the neural tube may result in?

Answer 2

Various neural disorders such as anencephaly and spina bifida

Question 3

What is apoptosis? What is its association with brain development?

Answer 3

Programmed cell death

—as neurons in brain extend to make connections, space must be made
—up to 20-30% of neurons will die to make room for new connections
“Synaptic pruning”