1- Forms a thickened neural plate by induction from notochord signals.
neural groove
cranial pore
neural tube
overlying ectoderm

2- Forms by apposition and fusion of the apical surfaces of the neural folds
neural plate
notochord
neural tube
cranial pore

3- Last event of the formation of the neural tube
folding of the neural plate
closure of the neural tube
closure of neuropores
subdivision of the spinal chord

4- Closure defect of the spinal chord
rachischis
cranioschisis
elevated a-fetoprotein
nerulation

5- Used to diagnose neural tube closure defects
decreased a-fetoprotein in the amniotic fluid
ultrasound scanning
increased a-fetoprotein in mother's blood
increased ectodermal cells in the amniotic fluid

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Answers:

1- Forms a thickened neural plate by induction from notochord signals.
Answer: overlying ectoderm

2- Forms by apposition and fusion of the apical surfaces of the neural folds
Answer: neural tube

3- Last event of the formation of the neural tube
Answer: closure of neuropores

4- Closure defect of the spinal chord
Answer: rachischis

5- Used to diagnose neural tube closure defects
Answer: ultrasound scanning